Visit after the event window closes

**My Thought Process for Evaluating Member 40406 Against QM-FUM for Measurement Year 2026**

Alright, I need to assess member 40406 against the QM-FUM quality measure for the 2026 measurement year. Let's break down the criteria and the member's information.

First, the basic eligibility:
*   **DOB:** 1992-08-14. This means they'll be 34 in 2026, which satisfies the "> 6 years" age requirement. Good.
*   **Enrolment:** They were continuously enrolled from 2026-01-01 to 2026-12-31. This also checks out.

Now for the critical part: the event and its timing. The quality measure specifies an **event** as an emergency department (ED) visit with a principal mental health diagnosis (excluding tobacco use) that must occur *between 2026-01-01 and 2026-12-01*. This date range is crucial because the measure explicitly states: "Visits after 2026-12-01 are excluded so the follow-up window can close inside the measurement year."

The member had an ED visit on 2026-12-09, with a principal diagnosis of F32.9 (mental health, not tobacco). Here's the snag: this visit occurred on 2026-12-09. According to the rule, visits *after* 2026-12-01 are excluded from being considered the qualifying event for the denominator.

So, my first thought is: this ED visit doesn't meet the event date criteria. It falls outside the specified window of January 1st to December 1st, 2026.

The rule then states: "A member who never enters the denominator is 'not_eligible' even if a compliance event is present in the record." Since this ED visit is the only event recorded and it doesn't meet the date requirement for the denominator, the member *never enters the denominator*.

Therefore, the status must be **"not_eligible"**.

The reason for this status is directly tied to the ED visit's timing: "The emergency department visit on 2026-12-09 occurred after the eligible event cutoff of 2026-12-01." I've double-checked this; the wording "between 2026-01-01 and 2026-12-01" is very clear, and the subsequent exclusion clause reinforces that the event *must* be within that period to be considered for the denominator. It's not an exclusion *from* the measure in the typical sense (like an E1/E2 exclusion), but rather a condition for *entering* the denominator in the first place. Because the event condition for the denominator wasn't met, the member is out.

Since the member is "not_eligible" for the denominator, they inherently cannot have met the follow-up criteria. So, `met_7_day` should be `false` and `met_30_day` should be `false`.

I've also confirmed there are no other ED visits for this member that could potentially qualify. Given all this, the final JSON output should reflect:

```json
{
"status": "not_eligible",
"reason": "The emergency department visit on 2026-12-09 occurred after the eligible event cutoff of 2026-12-01.",
"met_7_day": false,
"met_30_day": false
}
```

The reason string is concise (14 words, one sentence) and accurately reflects the core issue. "Not_eligible" is indeed the correct status because the member never qualified for the denominator based on the event date requirement.

**My Thought Process for QM-FUM Member Placement**

Alright, let's break down how I'm assessing this member against the QM-FUM specification. My primary goal here is to determine their eligibility and whether they meet the criteria for this quality measure.

First, I've established the measurement year: it's a clear window from January 1, 2026, to December 31, 2026. I also have the member's details: born August 14, 1992, making them 34 years old during 2026. Crucially, their enrollment is continuous throughout the entire measurement year, so that's not an issue.

Now, I'm examining the reported events. I see an ED visit on December 9, 2026, with a principal diagnosis of F32.9 (Major depressive disorder, single episode, unspecified). They were discharged home. Following that, there was an office visit with a psychiatric nurse practitioner on December 12, 2026.

Here's where the critical juncture arises. I need to meticulously check the *event criteria* for the denominator. The specification states: "an emergency department visit with a principal mental health diagnosis (F01-F99, excluding F17.- tobacco use) between 2026-01-01 and 2026-12-01. Visits after 2026-12-01 are excluded so the follow-up window can close inside the measurement year."

My eyes immediately go to the date of the ED visit: December 9, 2026. This date falls *after* the specified cutoff of December 1, 2026. Because of this, the member simply never enters the denominator population. The reason for this exclusion is precisely because their qualifying ED visit occurred after the defined cutoff.

So, my immediate determination is that the member is "not_eligible." I need to articulate this reason clearly and concisely, adhering to the constraints: "one sentence, under 30 words, naming the specific criterion or date that decided it." After a bit of refinement, I've landed on: "The emergency department visit on 2026-12-09 occurred after the eligible event cutoff date of 2026-12-01." This is 15 words and clearly states the exact reason.

Given that the member is "not_eligible," any subsequent metrics like `met_7_day` or `met_30_day` are irrelevant. For members who are excluded or not eligible for any reason under QM-FUM, both `met_7_day` and `met_30_day` must be reported as `false`.

I've also double-checked the exclusion criteria, confirming there's no admission (E1) or death (E2) that would alter this outcome. It's a straightforward failure to meet the event criteria for denominator inclusion.

Therefore, the final output in JSON format will be:

```json
{
  "status": "not_eligible",
  "reason": "The emergency department visit on 2026-12-09 occurred after the eligible event cutoff date of 2026-12-01.",
  "met_7_day": false,
  "met_30_day": false
}
```
This seems to cover all the requirements and accurately reflects the member's status based on the provided specification.

**My Thought Process for QM-FUM Member 40406**

Alright, let's break down the assessment for Member 40406 against the QM-FUM measure for the 2026 measurement year.

First, I need to get my head around the measure itself. QM-FUM, "Follow-up after Emergency Department Visit for Mental Illness." The measurement period is clear: January 1st, 2026, through December 31st, 2026.

Now, to qualify for the denominator, several criteria must be met for the *event*:
*   The patient needs to be at least 6 years old at the time of the ED visit.
*   The ED visit must have a principal mental health diagnosis (from F01-F99, excluding F17).
*   Crucially, the ED visit itself must have occurred between January 1st, 2026, and December 1st, 2026. This date range is critical for defining the eligible population for the *event*.
*   And, there's a continuous enrollment requirement from the ED visit date through 30 days after.

For the numerator, we're looking for a follow-up visit with a mental health practitioner within 7 days (N7) or within 30 days (N30) of the ED visit.

There are also exclusion criteria (E1: admission/observation from ED, E2: death within 30 days), but these only matter if the member *initially* qualifies for the denominator.

Okay, let's apply this to Member 40406.
*   DOB: 1992-08-14.
*   Enrolment: Continuous throughout 2026. So, that requirement is met.

Now, the events:
*   Event 1: ED visit on 2026-12-09. Principal diagnosis: F32.9 (Major depressive disorder, unspecified). Patient was discharged home.

Let's check the criteria for this event:
1.  **Age:** DOB 1992-08-14, ED visit 2026-12-09. That makes the member 34 years old. This meets the "age 6+" requirement. Good.
2.  **Diagnosis:** F32.9. This falls within the F01-F99 range and is not F17. So, the diagnosis is correct. Good.
3.  **Event Date:** The measure states the event must be "between 2026-01-01 and 2026-12-01." My ED visit is on 2026-12-09. Immediately, this triggers a red flag. 2026-12-09 is *after* 2026-12-01. This means the event itself does not fall within the defined window for eligible ED visits.

Because the ED visit date (2026-12-09) falls outside the specified eligible event window of 2026-01-01 through 2026-12-01, this member is *not eligible* for the measure. They never enter the denominator because the defining event itself doesn't meet the criteria. The prose mentioning "visits after 2026-12-01 are excluded" reinforces this; it's a condition that prevents them from even being considered for the denominator.

Since they are "not_eligible," the subsequent follow-up visits (Event 2, the office visit on 2026-12-12) don't even get evaluated for numerator compliance. The instructions are clear: for members "not_eligible," both `met_7_day` and `met_30_day` should be reported as `false`.

So, the status is `not_eligible`.
The reason needs to concisely state why. It's the date of the ED visit relative to the eligibility window. "The emergency department visit occurred on 2026-12-09, which is after the denominator event window ending 2026-12-01." That's 18 words and clearly explains the issue.

And finally, `met_7_day` is `false`, and `met_30_day` is `false`, as per the specific instructions for non-eligible members.

The output format should be a single JSON object with these keys: `status`, `reason`, `met_7_day`, and `met_30_day`.

Therefore, the final assessment is:
```json
{
  "status": "not_eligible",
  "reason": "The emergency department visit occurred on 2026-12-09, which is after the denominator event window ending 2026-12-01.",
  "met_7_day": false,
  "met_30_day": false
}
```

Alright, let's break down this member's record against the QM-FUM quality measure. I've gone through the process step-by-step to ensure accuracy.

First, I focused on **eligibility**, which is the critical first hurdle.

*   **Age Check:** The member was born in 1992, and the ED visit in question is in 2026. This puts them at 34 years old, well within the measure's requirement of being 6 or older. So, that's a pass.
*   **Event Qualification:** The core of the denominator is the ED visit. I see one on December 9th, 2026. The principal diagnosis is F32.9, which falls within the acceptable F01-F99 range and isn't an excluded F17.- code. So far, so good. Now, for the *timing* of that visit. The specification is quite clear: eligible visits must be between January 1st, 2026, and *December 1st, 2026*. This is to ensure the follow-up window closes within the measurement year. Unfortunately, this member's ED visit is on December 9th, 2026, which is *after* that December 1st cut-off. This is the crucial point for eligibility.
*   **Continuous Enrollment:** I also confirmed continuous enrollment throughout 2026. The requirement is from the ED visit date through 30 days after. Since they were enrolled for the entire year, this condition is met.

However, because of that ED visit date falling *after* the cut-off, the member is **not_eligible** for the denominator.

Even though they are not eligible, I did a quick check on **exclusions** just to be thorough.

*   E1 (inpatient admission/observation): The visit resulted in discharge home, so this exclusion doesn't apply.
*   E2 (deceased): The member was alive throughout, so this exclusion also doesn't apply.

Now, regarding the **numerator** criteria – the follow-up care.

*   The ED visit was on December 9th, 2026.
*   A follow-up visit occurred on December 12th, 2026, with a psychiatric nurse practitioner, which is a valid mental health practitioner.
*   This follow-up is on day 3 of the follow-up period (day 1 being the 10th, day 2 the 11th, day 3 the 12th). This successfully meets the 7-day window (N7) and consequently the 30-day window (N30).

But, and this is the key, because the member was determined to be **not_eligible** from the outset based on the ED visit date, their compliance with the numerator criteria doesn't change their final status. As per the instructions for "not_eligible" members, the `met_7_day` and `met_30_day` flags must be `false`.

Therefore, my **final determination** is:

*   **Status:** "not_eligible"
*   **Reason:** The qualifying emergency department visit occurred after the 2026-12-01 cutoff date for eligible events.
*   **met_7_day:** `false`
*   **met_30_day:** `false`

This leads directly to the JSON output:
```json
{
  "status": "not_eligible",
  "reason": "The emergency department visit occurred after the 2026-12-01 cutoff date for eligible events.",
  "met_7_day": false,
  "met_30_day": false
}
```
This seems to be the most accurate and compliant outcome based on the provided data and measure specifications. The date of the ED visit is the decisive factor here.

Alright, let's break down this QM-FUM evaluation for Member 40406. My primary task here is to assess whether this member qualifies under the Follow-Up After an Emergency Department Visit for Mental Illness (QM-FUM) measure for the 2026 performance year.

First, I need to deeply understand the measure itself, QM-FUM. The measurement period is set from January 1, 2026, to December 31, 2026. For a member to even be considered eligible for the denominator, they must have had an ED visit between January 1, 2026, and December 1, 2026. Crucially, they need to be at least 6 years old on the date of that ED visit, and they must have had continuous enrollment from the date of their ED visit right through to 30 days afterward, with absolutely no gaps. The numerator has two parts: either a follow-up visit with a mental health practitioner within 7 days of the ED visit, or within 30 days. The count for these follow-up days starts the day *after* the ED visit. A visit on the same day as the ED doesn't count, and if they meet the 7-day criteria, they automatically meet the 30-day criteria. Now, there are also specific exclusions: if the ED visit results in an inpatient admission or observation stay, they're out. And if the member passes away within that 30-day follow-up period, that also disqualifies them.

Next, I need to meticulously examine the provided record for Member 40406. Their date of birth is August 14, 1992, and their enrollment is solid – continuous from January 1, 2026, through December 31, 2026. This continuous enrollment piece looks good, covering any potential follow-up window.

Now, for the critical event: an ED visit occurred on December 9, 2026. The principal diagnosis for this visit was F32.9, which is Major depressive disorder, single episode, unspecified. This diagnosis falls squarely within the F01-F99 range and is not the excluded F17.- category, so that's a good sign. The record also indicates they were discharged home from the ED, meaning Exclusion E1 (inpatient admission or observation) doesn't apply. Later, there's a record of an office visit with a psychiatric nurse practitioner on December 12, 2026. And importantly, the member was alive throughout this entire period, so Exclusion E2 (death) is also not a factor.

With the measure specification and the member's record in hand, I'll now evaluate against the denominator criteria.

First, age. The ED visit was on December 9, 2026. The member was born in August 1992, making them 34 years old at the time of the visit. This easily meets the "6 years or older" requirement. So, the age criterion is met.

Next, the event itself. The ED visit was on December 9, 2026. Here's where it gets tricky. The measure specification is very clear: "Visits after 2026-12-01 are excluded so the follow-up window can close inside the measurement year." This member's ED visit on December 9th falls *after* that December 1st cutoff. Because of this specific exclusion related to the event date, this member's ED visit does not qualify them for the denominator. They are, therefore, "not_eligible." The continuous enrollment would have been fine, but the event date invalidates their eligibility upfront.

So, based on this, the member's status is definitively "not_eligible." The reason for this is precisely because their emergency department visit occurred *after* the mandated 2026-12-01 cutoff date, which is a requirement for them to be included in the denominator population for this measure.

Now, regarding `met_7_day` and `met_30_day`: the instructions are unambiguous. For any member deemed "excluded" or "not_eligible" under QM-FUM, both of these should be reported as false. So, `met_7_day` will be false, and `met_30_day` will also be false.

Just as a mental exercise, even though they are not eligible, let's quickly check the follow-up logic. The ED visit was December 9, 2026. The follow-up visit was December 12, 2026. The 7-day window starts December 10th (day 1) and ends December 16th (day 7). The December 12th visit falls within this window, so `met_7_day` *would have been* true. The 30-day window starts December 10th (day 1) and ends January 8, 2027 (day 30). Again, the December 12th visit is within this period, so `met_30_day` *would have been* true. However, because their overall status is `not_eligible`, these must be set to false as per the rules.

Therefore, the final JSON structure reflects this:
```json
{
  "status": "not_eligible",
  "reason": "The member's emergency department visit occurred after the 2026-12-01 cutoff date required for the denominator.",
  "met_7_day": false,
  "met_30_day": false
}
```
The reason is clear and directly tied to the measure's requirements. The status is correct, and the boolean flags are appropriately set to false given the member's ineligible status. The logic holds, especially the critical point about the ED visit date.

My internal thought process to evaluate this member's record against the QM-FUM quality measure went something like this:

First, I needed to determine if the member was even eligible to be considered for this measure. This means checking the denominator criteria.

The primary requirements for the denominator are age and the occurrence of a qualifying event.

*   **Age Check:** The member was born on August 14, 1992. The Emergency Department (ED) visit in question occurred on December 9, 2026. Calculating the age at the time of the visit: 2026 - 1992 = 34 years old. Since the measure specifies individuals 6 years or older, this age criterion is met.

*   **Event Check:** Now, I examined the ED visit itself. The date was December 9, 2026, with a principal diagnosis of F32.9. I confirmed that F32.9 falls within the F01-F99 range and is not an F17.- code, so the diagnosis itself is valid for the measure. However, a crucial detail here is the date of the visit relative to the measurement period. The measure specifies that the event must occur "between 2026-01-01 and 2026-12-01." The ED visit on December 9, 2026, falls *outside* this defined window. The rationale for this exclusion, as per the specification, is to ensure that the follow-up period can conclude within the measurement year. Therefore, this specific ED visit, by its date, disqualifies the member from being counted for this event.

Based on this, my immediate conclusion regarding eligibility is that the member is **"not_eligible"** due to the ED visit occurring after the permitted event window, which closes on December 1, 2026.

Even though I've established ineligibility, for a thorough process, I mentally ran through the exclusion criteria and numerator compliance checks, just to be absolutely certain and to fully document my thought process.

*   **Exclusion E1 (Inpatient/Observation):** The record indicated the member was "Discharged home." This clearly means there was no inpatient or observation stay, so Exclusion E1 does not apply.

*   **Exclusion E2 (Death):** The record stated, "Member alive throughout." Therefore, Exclusion E2 is also not applicable.

*   **Numerator Compliance (for completeness):**
    *   The ED visit date was December 9, 2026.
    *   The 7-day follow-up window would be from December 10, 2026, to December 16, 2026.
    *   The 30-day follow-up window would be from December 10, 2026, to January 8, 2027.
    *   There was a follow-up visit on December 12, 2026, which was an office visit with a psychiatric nurse practitioner – a qualified mental health practitioner.
    *   This follow-up visit *does* fall within the 7-day window (December 12th is between December 10th and 16th).
    *   Since it met the 7-day window, it would also inherently meet the 30-day window.
    *   However, this numerator compliance is moot because the member was already deemed not eligible based on the event date.

Therefore, my **Final Determination** is solely based on the eligibility findings. The member is **"not_eligible"** primarily because the date of the ED visit did not fall within the acceptable event window for this measure.

Finally, I translated this into the specific QM-FUM keys:

*   `met_7_day`: As the member is "not_eligible," the rule dictates this should be reported as `false`.
*   `met_30_day`: Similarly, due to the "not_eligible" status, this is also reported as `false`.

This leads to the construction of the JSON response:
*   `status`: "not_eligible"
*   `reason`: "The emergency department visit occurred after the 2026-12-01 cutoff date for events."
*   `met_7_day`: false
*   `met_30_day`: false

Let me work through this carefully.

Measure QM-FUM. Measurement year 2026-01-01 through 2026-12-31.

Eligible population (denominator):
- Age: 6 years or older as of the date of the ED visit. Member DOB 1992-08-14, so as of 2026-12-09 they are 34 years old. ✓
- Event: an ED visit with a principal mental health diagnosis (F01-F99, excluding F17.-) between 2026-01-01 and 2026-12-01. The visit is on 2026-12-09, with principal diagnosis F32.9 (major depressive disorder, single episode, unspecified — that's in F32, which is within F01-F99 and not F17.-). BUT the visit date is 2026-12-09, which is AFTER 2026-12-01. The specification says visits after 2026-12-01 are excluded so the follow-up window can close inside the measurement year. So this visit does NOT qualify for the denominator event.

Wait, "between 2026-01-01 and 2026-12-01" — does that mean inclusive of 2026-12-01? The visit is 2026-12-09, which is after 2026-12-01 either way. So the visit does not qualify.

So the member never enters the denominator — status "not_eligible".

The visit after 2026-12-01 is excluded from the denominator event. So even though there's a follow-up visit on 2026-12-12 (3 days after, which would be within 7 days), the member is "not_eligible" because the ED visit doesn't qualify as a denominator event.

Per the task family instructions: "A member who never enters the denominator is 'not_eligible' even if a compliance event is present in the record."

Required additional keys for QM-FUM items:
- "met_7_day": boolean
- "met_30_day": boolean
For a member who is "excluded" or "not_eligible" under QM-FUM, report both as false.

So met_7_day = false, met_30_day = false.

Reason: one sentence, under 30 words, naming the specific criterion or date that decided it. Something like: "The emergency department visit on 2026-12-09 falls after the 2026-12-01 qualifying window, so it never enters the denominator."

Let me check the exclusions: E1 — inpatient admission or observation stay. The record says "Discharged home" — so no inpatient admission. E2 — death during 30 days; member alive throughout. So no exclusion applies, but it doesn't matter since the member isn't in the denominator.

Continuous enrolment: 2026-01-01 through 2026-12-31, continuous — fine, but moot.

Also, the follow-up visit on 2026-12-12: day counting — ED visit 2026-12-09, day after counts as day 1, so 2026-12-10 = day 1, 2026-12-11 = day 2, 2026-12-12 = day 3. That would be within 7 days and within 30 days. But since the member is not eligible, both are reported false.

Status: "not_eligible".

Reason: "ED visit on 2026-12-09 with F32.9 falls after the 2026-12-01 qualifying-event cutoff, so it never enters the denominator."

That's under 30 words. Good.

Output JSON:
{
  "status": "not_eligible",
  "reason": "...",
  "met_7_day": false,
  "met_30_day": false
}

Let me work through this measure step by step.

Measure QM-FUM:
- Measurement year: 2026-01-01 through 2026-12-31.
- Eligible population: age 6+ as of date of ED visit; ED visit with principal mental health diagnosis (F01-F99 excluding F17.-) between 2026-01-01 and 2026-12-01. Visits after 2026-12-01 are excluded so the follow-up window can close inside the measurement year.

Member 40406:
- DOB 1992-08-14, so age on 2026-12-09 is 34 — age eligible.
- ED visit 2026-12-09, principal diagnosis F32.9 (major depressive disorder, single episode, unspecified) — a mental health diagnosis, not F17.
- BUT the visit date is 2026-12-09, which is after 2026-12-01. The specification says qualifying ED visits must occur between 2026-01-01 and 2026-12-01. Visits after 2026-12-01 don't enter the denominator because the 30-day follow-up window wouldn't close inside the measurement year.

So this visit never enters the denominator — the event date is out of the qualifying window. The member is "not_eligible" — never enters the denominator (age, event, or enrolment). The event criterion isn't met because the visit date is after 2026-12-01.

Even though there is a follow-up visit on 2026-12-12 (3 days after, day 1 = 12-10, so 12-12 is day 3, within 7 days), the member never enters the denominator. Per the task instructions: "A member who never enters the denominator is 'not_eligible' even if a compliance event is present in the record."

So status = "not_eligible".

Reason: The ED visit on 2026-12-09 falls after the 2026-12-01 event cutoff, so it never enters the denominator.

Required keys for QM-FUM items: met_7_day and met_30_day. For a member who is "excluded" or "not_eligible" under QM-FUM, report both as false.

So met_7_day: false, met_30_day: false.

Reason must be one sentence under 30 words. "The emergency department visit occurred on 2026-12-09, after the 2026-12-01 event cutoff, so the member never enters the denominator."

That's under 30 words. Let me count: The(1) emergency(2) department(3) visit(4) occurred(5) on(6) 2026-12-09(7), after(8) the(9) 2026-12-01(10) event(11) cutoff(12), so(13) the(14) member(15) never(16) enters(17) the(18) denominator(19). Good.

Output JSON:
{
  "status": "not_eligible",
  "reason": "...",
  "met_7_day": false,
  "met_30_day": false
}

Let me work through this carefully.

The measure QM-FUM:
- Measurement year: 2026-01-01 through 2026-12-31.
- Eligible population: ED visit with principal mental health diagnosis (F01-F99, excluding F17) between 2026-01-01 and 2026-12-01. Visits after 2026-12-01 are excluded so the follow-up window can close inside the measurement year.

Member: ED visit 2026-12-09 with principal diagnosis F32.9 (major depressive disorder, single episode, unspecified — that's an F code, F32.9, within F01-F99, not F17). But the visit date is 2026-12-09, which is after 2026-12-01. So the visit does not qualify — visits after 2026-12-01 are excluded from the eligible population.

So the member is "not_eligible" — never enters the denominator because the ED visit occurred after 2026-12-01 cutoff.

The follow-up visit 2026-12-12 is present in the record but the member never enters the denominator. Per instructions: "A member who never enters the denominator is 'not_eligible' even if a compliance event is present in the record."

Age: born 1992-08-14, so at ED visit 2026-12-09 they are 34 years old — age 6+ satisfied. But that doesn't matter since the date cutoff fails.

Enrolment: continuous 2026-01-01 through 2026-12-31 — continuous enrolment satisfied (visit through 30 days after: 2026-12-09 to 2027-01-08; enrolment runs through 2026-12-31... hmm, wait. Continuous enrolment: from the date of the ED visit through 30 days after, with no gaps. 30 days after 2026-12-09 is 2027-01-08. Enrolment ends 2026-12-31. Does the member have continuous enrolment through 30 days after the visit? The enrolment record says "2026-01-01 through 2026-12-31, continuous." The 30-day window extends to 2027-01-08, which is beyond the enrolment end. Hmm.

But the primary gate is the event date: the ED visit must be between 2026-01-01 and 2026-12-01. 2026-12-09 is after 2026-12-01, so the visit doesn't qualify regardless. The spec says "Visits after 2026-12-01 are excluded so the follow-up window can close inside the measurement year." So the member is not_eligible.

Actually, let me think about whether "not_eligible" vs something else. The task says: "not_eligible — never enters the denominator (age, event, or enrolment)". The event criterion fails (visit after 2026-12-01). So not_eligible.

Reason: one sentence, under 30 words, naming the specific criterion or date that decided it. E.g., "ED visit on 2026-12-09 falls after the 2026-12-01 event cutoff, so the visit does not qualify for the denominator despite the 2026-12-12 follow-up."

Word count check: "ED visit on 2026-12-09 falls after the 2026-12-01 event cutoff, so the visit does not qualify for the denominator despite the 2026-12-12 follow-up." Count: ED(1) visit(2) on(3) 2026-12-09(4) falls(5) after(6) the(7) 2026-12-01(8) event(9) cutoff(10) so(11) the(12) visit(13) does(14) not(15) qualify(16) for(17) the(18) denominator(19) despite(20) the(21) 2026-12-12(22) follow-up(23). 23 words. Good.

QM-FUM requires met_7_day and met_30_day keys. For a member who is "excluded" or "not_eligible" under QM-FUM, report both as false. So both false.

The 2026-12-12 visit: is it within 7 days? Day after visit = 2026-12-10 is day 1, so 2026-12-12 is day 3 — within 7 days. But since the member is not_eligible, we report false per the explicit instruction. The instruction is clear: "For a member who is 'excluded' or 'not_eligible' under QM-FUM, report both as false."

Output JSON:

```json
{
  "status": "not_eligible",
  "reason": "ED visit on 2026-12-09 falls after the 2026-12-01 event cutoff, so the visit does not qualify for the denominator despite the 2026-12-12 follow-up.",
  "met_7_day": false,
  "met_30_day": false
}
```

That's it.

We need answer JSON only. Need parse task.

Measure QM-FUM: Follow-up after ED visit for mental illness. Measurement year 2026-01-01 through 2026-12-31.

Denominator:
- Age: 6 years or older as of date of ED visit.
- Event: ED visit with principal mental health diagnosis (F01-F99, excluding F17.- tobacco use) between 2026-01-01 and 2026-12-01. Visits after 2026-12-01 are excluded so follow-up window can close inside measurement year. Each qualifying visit counted separately.
- Continuous enrolment: from date of ED visit through 30 days after, with no gaps.

Numerator:
- N7: follow-up visit with mental health practitioner within 7 days after ED visit, counting day after visit as day 1.
- N30: within 30 days after, same way.
- Same calendar day as ED visit does NOT count. Meeting N7 also meets N30.

Required exclusions:
- E1: ED visit results in inpatient admission or observation stay any length. Report visit excluded, not non-compliant.
- E2: Death during 30 days following visit.

Member record:
Member 40406. DOB 1992-08-14.
Enrolment: 2026-01-01 through 2026-12-31 continuous.
History:
2026-12-09 ED visit, principal diagnosis F32.9. Discharged home.
2026-12-12 Office visit with a psychiatric nurse practitioner.
Member alive throughout.

Need determine status.

First check date of ED visit: 2026-12-09. Denominator event window is between 2026-01-01 and 2026-12-01. Wait: "Visits after 2026-12-01 are excluded so the follow-up window can close inside the measurement year." 2026-12-09 is after 2026-12-01. So this ED visit is NOT a qualifying event. Therefore member never enters denominator. Status "not_eligible". Reason one sentence under 30 words naming specific criterion or date that decided it. Need mention ED visit on 2026-12-09 is after the 2026-12-01 denominator event cutoff, so not a qualifying visit. Need maybe also age? DOB 1992-08-14, on 2026-12-09 age is 34 (>=6), enrolment continuous from visit through 30 days? Visit 12-09 plus 30 days = 2027-01-08? Actually 30 days after is 2027-01-08? Wait Dec 9 + 30 days = Jan 8, 2027 (since Dec has 31 days: 22 days left in Dec after Dec 9? Let's count: day after Dec 9 is day 1 = Dec 10. 30 days after visit means within 30 days after? Numerator N30: follow-up within 30 days after ED visit counting day after as day 1. Day 30 after Dec 9 is Jan 8, 2027? Let's count: Dec 10 day1, Dec 31 day22, Jan 1 day23, Jan 8 day30. So window extends to Jan 8, 2027. Continuous enrolment required from date of ED visit through 30 days after, no gaps. But enrolment is 2026-01-01 through 2026-12-31, continuous. There is a gap after 2026-12-31. Since 30 days after Dec 9 goes into 2027, enrolment ends 2026-12-31, so not continuous through 30 days after (needs through Jan 8 2027). That is another reason for not eligible? Wait denominator continuous enrolment criterion: "from the date of the emergency department visit through 30 days after, with no gaps." The ED visit date 2026-12-09; 30 days after is 2027-01-08. Enrolment only through 2026-12-31. So member does not have continuous enrolment through 30 days after. That also makes them not in denominator (event fails). But primary reason: event occurred after 2026-12-01, so excluded from denominator entirely. Actually the specification: Event: an ED visit ... between 2026-01-01 and 2026-12-01. Visits after 2026-12-01 are excluded so follow-up window can close inside measurement year. Each qualifying visit counted separately. So if visit after 2026-12-01, it's not an eligible event; member never enters denominator. Also continuous enrolment would fail because enrolment ends before 30 days after. Which criterion is "specific criterion or date that decided it"? We can say ED visit on 2026-12-09 is after the 2026-12-01 denominator event cutoff. That's the specific date and criterion. Or mention also enrolment gap? Reason must be one sentence, under 30 words. Could include both? Need name specific criterion or date that decided it. If status not_eligible, reason: "The 2026-12-09 ED visit is after the 2026-12-01 denominator event cutoff, so it is not a qualifying visit." That's 22 words? Count: The(1) 2026-12-09(2) ED(3) visit(4) is(5) after(6) the(7) 2026-12-01(8) denominator(9) event(10) cutoff,(11) so(12) it(13) is(14) not(15) a(16) qualifying(17) visit(18). Under 30. Good. But is there any other eligible ED visit? Only one, on 2026-12-09. Also follow-up 2026-12-12 is 3 days after? Actually Dec 10 day1, Dec 11 day2, Dec 12 day3, so within 7 days, but since not eligible, met_7_day and met_30_day both false per instructions: "For a member who is 'excluded' or 'not_eligible' under QM-FUM, report both as false." Yes. So met_7_day false, met_30_day false.

Wait need verify age: DOB 1992-08-14. On 2026-12-09, age = 34 (turned 34 on 2026-08-14). >=6, okay.

Check if the office visit is with a mental health practitioner: psychiatric nurse practitioner. That's mental health practitioner. But event not qualifying, so ignore.

Check exclusions: No inpatient/observation, discharged home; alive. But exclusions only evaluated before numerator for denominator members. Member not eligible, so not excluded. Status not_eligible.

Need output JSON with keys: "status", "reason", "met_7_day", "met_30_day". Wait task says Items drawn from measure QM-FUM require two further keys: met_7_day, met_30_day. So include those. For not_eligible, report both false.

Need reason string one sentence under 30 words. Ensure no extra keys.

Let's verify if there is any nuance: Denominator event window says "between 2026-01-01 and 2026-12-01." Does "between" include 2026-12-01? Usually inclusive? It says between 2026-01-01 and 2026-12-01. Visits after 2026-12-01 are excluded. So the last eligible date is 2026-12-01. Our visit is 2026-12-09, after, so not eligible. Good.

But what about continuous enrolment: The event is not qualifying, so we don't consider continuous enrolment? Actually denominator requires event AND continuous enrolment. If event fails, not eligible. The reason should name the criterion that decided it. The event date cutoff is the deciding factor. Yes.

Let's draft JSON:

{
  "status": "not_eligible",
  "reason": "The 2026-12-09 ED visit is after the 2026-12-01 denominator event cutoff, so it is not a qualifying visit.",
  "met_7_day": false,
  "met_30_day": false
}

Check reason word count: Let's count precisely: The(1) 2026-12-09(2) ED(3) visit(4) is(5) after(6) the(7) 2026-12-01(8) denominator(9) event(10) cutoff,(11) so(12) it(13) is(14) not(15) a(16) qualifying(17) visit(18). That's 18 words. Under 30. Good. The date format in reason: They said dates are ISO 8601. Should we write dates as ISO in prose? Yes, dates are ISO 8601. We used 2026-12-09 and 2026-12-01. Good.

Wait the reason says "2026-12-01 denominator event cutoff". The spec says visits after 2026-12-01 are excluded. Maybe say "after 2026-12-01" not "after the 2026-12-01 cutoff". The sentence: "The ED visit on 2026-12-09 is after 2026-12-01, so it is not a qualifying ED visit for the denominator." Count: The(1) ED(2) visit(3) on(4) 2026-12-09(5) is(6) after(7) 2026-12-01(8), so(9) it(10) is(11) not(12) a(13) qualifying(14) ED(15) visit(16) for(17) the(18) denominator(19). 19 words. That is clear.

But maybe we should name the criterion: "The visit date 2026-12-09 falls after the 2026-12-01 denominator event end date, so no qualifying visit." Count: The(1) visit(2) date(3) 2026-12-09(4) falls(5) after(6) the(7) 2026-12-01(8) denominator(9) event(10) end(11) date,(12) so(13) no(14) qualifying(15) visit(16). 16 words. Good.

Need ensure "status" exactly one of strings: "not_eligible" yes.

Wait check: Is there any possibility that the member had an ED visit on 2026-12-09, and the measurement year ends 2026-12-31, follow-up on 2026-12-12 is within measurement year, but the 30-day window extends into 2027, so not eligible due to continuous enrolment too. But because the visit is after 2026-12-01, it's already not eligible. The spec explicitly says visits after 2026-12-01 are excluded so the follow-up window can close inside the measurement year. This is a hard exclusion from denominator. So not_eligible.

Let's be careful about "excluded" vs "not_eligible". The spec: "Visits after 2026-12-01 are excluded so the follow-up window can close inside the measurement year." The word "excluded" here might confuse with required exclusions? It says under Eligible Population: "Visits after 2026-12-01 are excluded..." That means those visits are not part of the denominator event; the member with only such visit never enters denominator. Status should be "not_eligible", not "excluded", because "excluded" status is for meeting a required exclusion (E1 or E2) after being in denominator. The task says: status "excluded" — meets a required exclusion, so removed from the denominator. The visit after 2026-12-01 is not a required exclusion (E1/E2), it's a denominator event timing criterion. The member never enters denominator, so not_eligible. The instructions: "A member who never enters the denominator is 'not_eligible' even if a compliance event is present in the record." Yes.

Also for QM-FUM, if excluded or not_eligible, met_7_day and met_30_day false. Good.

Need output exactly one fenced JSON code block and nothing else. No preamble. Use ```json ... ```.

Let's prepare final.

Double-check JSON syntax: keys in double quotes, booleans lowercase false, no trailing comma. That's it.

One more nuance: The member is alive throughout. Enrolment 2026-01-01 through 2026-12-31 continuous. Follow-up visit 2026-12-12 is within enrolment and within 7 days of ED (Dec 9 + day after: Dec10 day1, Dec11 day2, Dec12 day3). If the visit had been eligible, met_7_day true, met_30_day true. But not eligible, set false. Good.

Let's ensure reason names specific criterion or date that decided it. It does: visit date 2026-12-09 after 2026-12-01 denominator event end date.

Could also mention "denominator event window ends 2026-12-01". The phrase "denominator event window" maybe better. Sentence: "The ED visit on 2026-12-09 is after the 2026-12-01 denominator event window end, so it is not a qualifying visit." Count: The(1) ED(2) visit(3) on(4) 2026-12-09(5) is(6) after(7) the(8) 2026-12-01(9) denominator(10) event(11) window(12) end,(13) so(14) it(15) is(16) not(17) a(18) qualifying(19) visit(20). 20 words. Good.

Let's finalize with that reason maybe. Actually "window end" might be slightly off; the spec says visits after 2026-12-01 are excluded. So "after 2026-12-01" is enough. I'll use: "The ED visit on 2026-12-09 is after 2026-12-01, so it is outside the denominator event window and not qualifying." Count: The(1) ED(2) visit(3) on(4) 2026-12-09(5) is(6) after(7) 2026-12-01,(8) so(9) it(10) is(11) outside(12) the(13) denominator(14) event(15) window(16) and(17) not(18) qualifying(19). 19 words. Good.

Need maybe period at end. Yes sentence ends with period.

Final JSON:

```json
{
  "status": "not_eligible",
  "reason": "The ED visit on 2026-12-09 is after 2026-12-01, so it is outside the denominator event window and not qualifying.",
  "met_7_day": false,
  "met_30_day": false
}
```

Check if reason under 30 words: 19. Good.

Need ensure no extra text outside block. Done.

We need answer JSON for QM-FUM. Need parse task.

We have measure QM-FUM Follow-Up After Emergency Department Visit for Mental Illness. Measurement year 2026-01-01 through 2026-12-31.

Eligible population denominator:
- Age: 6 years or older as of date of ED visit.
- Event: ED visit with principal mental health diagnosis (F01-F99, excluding F17.- tobacco use) between 2026-01-01 and 2026-12-01. Visits after 2026-12-01 are excluded so the follow-up window can close inside measurement year. Each qualifying visit counted separately.
- Continuous enrolment: from date of ED visit through 30 days after, with no gaps.

Numerator:
N7: follow-up visit with mental health practitioner within 7 days after ED visit, counting day after visit as day 1.
N30: within 30 days after, same.
Same calendar day as ED visit does NOT count. Meeting N7 also meets N30.

Required exclusions:
E1. ED visit results in inpatient admission or observation stay of any length. Report as excluded, not non-compliant.
E2. Death during 30 days following visit.

Member record:
MEMBER 40406. DOB 1992-08-14.
Enrolment: 2026-01-01 through 2026-12-31, continuous.
History:
2026-12-09 Emergency department visit, principal diagnosis F32.9. Discharged home.
2026-12-12 Office visit with a psychiatric nurse practitioner.
Member alive throughout.

Need place member against spec. Required JSON keys: status, reason, plus for QM-FUM: met_7_day, met_30_day. For excluded or not_eligible, report both false.

Let's analyze.

Event: ED visit date 2026-12-09 with principal dx F32.9 (major depressive disorder, single episode unspecified? F32.9 is in F01-F99, not tobacco F17). Age as of date of ED visit: DOB 1992-08-14. On 2026-12-09, age = 34 (since birthday Aug 14 2026 passed, turning 34 on 2026-08-14). 6 or older, yes.

But event date: The denominator requires ED visit between 2026-01-01 and 2026-12-01. Wait: "between 2026-01-01 and 2026-12-01. Visits after 2026-12-01 are excluded so the follow-up window can close inside the measurement year." The ED visit date is 2026-12-09, which is after 2026-12-01. Therefore, the visit is excluded from the denominator event? Let's read carefully: "Event: an emergency department visit with a principal mental health diagnosis ... between 2026-01-01 and 2026-12-01. Visits after 2026-12-01 are excluded so the follow-up window can close inside the measurement year. Each qualifying visit is counted separately."

Does "between 2026-01-01 and 2026-12-01" include 12-01? Usually between dates maybe inclusive? Then visits after 2026-12-01 are excluded. 2026-12-09 is after 2026-12-01, so it's excluded from the denominator because event date outside eligible window. Thus the member has no qualifying ED visit in measurement period? Actually the ED visit is after 2026-12-01, so it's not an eligible event; thus member never enters denominator. What status? "not_eligible" means never enters the denominator (age, event, or enrolment). The task says: "A member who never enters the denominator is 'not_eligible' even if a compliance event is present in the record." The reason: ED visit occurred 2026-12-09, after the 2026-12-01 cutoff, so no qualifying event in denominator. Thus status = not_eligible. Then met_7_day and met_30_day must be false? The task says: "For a member who is 'excluded' or 'not_eligible' under QM-FUM, report both as false." Yes. So both false.

Need reason: one sentence, under 30 words, naming the specific criterion or date that decided it. Need mention ED visit date after December 1 cutoff. Example: "The 2026-12-09 ED visit is after the 2026-12-01 eligibility cutoff, so no qualifying event enters the denominator." Count words: The(1) 2026-12-09(2) ED(3) visit(4) is(5) after(6) the(7) 2026-12-01(8) eligibility(9) cutoff,(10) so(11) no(12) qualifying(13) event(14) enters(15) the(16) denominator.(17) Under 30. Good. Or "ED visit on 2026-12-09 is after the 2026-12-01 event cutoff; the member is not eligible for the denominator." Need decide status not_eligible.

Wait check other criteria: continuous enrolment from date of ED visit through 30 days after, with no gaps. If ED visit 2026-12-09, 30 days after is 2027-01-08? Actually count day after as day 1, 30 days after? The follow-up window for N30 is within 30 days after ED visit. But the measurement year ends 2026-12-31. Enrolment is 2026-01-01 through 2026-12-31 continuous. Need continuous enrolment from date of ED visit through 30 days after. Date of visit 2026-12-09 plus 30 days? Let's compute: Day after visit is day 1 = 2026-12-10. Day 30 would be 2027-01-08? Let's check: If Dec 10 = day1, Dec 11 day2, ... Dec 31 is day22 (since Dec has 31 days; from Dec10 to Dec31 inclusive: 22 days? Let's count: Dec10 (1), Dec11(2), Dec12(3), Dec13(4), Dec14(5), Dec15(6), Dec16(7), Dec17(8), Dec18(9), Dec19(10), Dec20(11), Dec21(12), Dec22(13), Dec23(14), Dec24(15), Dec25(16), Dec26(17), Dec27(18), Dec28(19), Dec29(20), Dec30(21), Dec31(22). Then Jan1 day23, Jan2 day24, Jan3 d25, Jan4 d26, Jan5 d27, Jan6 d28, Jan7 d29, Jan8 d30. So 30 days after visit ends 2027-01-08. Enrolment only through 2026-12-31. That means continuous enrolment from date of ED visit through 30 days after is NOT satisfied because enrolment ends 2026-12-31, leaving a gap after 2026-12-31 before 30 days. But wait, does the enrolment criterion matter if the event itself is outside the eligible date window? The measure says eligible population denominator requires: Age; Event (visit between Jan1 and Dec1); Continuous enrolment from date of ED visit through 30 days after, no gaps. The visit is after Dec1, so event criterion fails. Therefore no denominator. Also continuous enrolment through 30 days after also fails because enrolment ends 2026-12-31, but the 30-day window extends into 2027. However, the specific criterion that decided it: Which is more direct? Both event date after cutoff, and enrolment gap after 2026-12-31? Let's read: "Event: an emergency department visit ... between 2026-01-01 and 2026-12-01. Visits after 2026-12-01 are excluded so the follow-up window can close inside the measurement year." Indeed, the purpose of the Dec 1 cutoff is to ensure the 30-day follow-up window can close inside the measurement year (by Dec 31). Wait, if visit is Dec 1, then 30 days after: day after Dec 1 is Dec 2 day1; day30 is Dec31? Let's check: Dec2 day1, Dec3 d2, Dec4 d3, Dec5 d4, Dec6 d5, Dec7 d6, Dec8 d7, Dec9 d8, Dec10 d9, Dec11 d10, Dec12 d11, Dec13 d12, Dec14 d13, Dec15 d14, Dec16 d15, Dec17 d16, Dec18 d17, Dec19 d18, Dec20 d19, Dec21 d20, Dec22 d21, Dec23 d22, Dec24 d23, Dec25 d24, Dec26 d25, Dec27 d26, Dec28 d27, Dec29 d28, Dec30 d29, Dec31 d30. Yes, a Dec 1 ED visit has its 30-day window end Dec 31. So the cutoff is Dec 1. Visit Dec 9 is after cutoff, thus excluded from denominator because follow-up window would extend into next year, and event is after Dec 1. So the deciding criterion is the ED visit date 2026-12-09 is after 2026-12-01 event cutoff. That's sufficient for not_eligible. There is also enrolment: continuous enrolment from date of ED visit through 30 days after, with no gaps. Member enrolment ends 2026-12-31, but the ED visit is 12-09, need through 2027-01-08, so enrolment gap exists. But since the event date itself is invalid, we don't even get to continuous enrolment? The denominator conditions are conjunctive: all must be met for the member to be in denominator. If event date outside window, not eligible. The reason can name the specific criterion or date that decided it. Naming the event cutoff date is specific. Should we also mention enrolment? The reason must be one sentence under 30 words. It can say "The 2026-12-09 ED visit is after the 2026-12-01 denominator cutoff, so the member is not eligible." That's enough.

But wait, perhaps there is nuance: The member had a follow-up visit on 2026-12-12 with psychiatric nurse practitioner. That is within 7 days? Let's check: ED visit 12-09. Day after visit is day1 = 12-10. 7 days after: day7 = 12-16? Let's count: 12-10 day1, 12-11 day2, 12-12 day3, 12-13 day4, 12-14 day5, 12-15 day6, 12-16 day7. So a visit on 12-12 is day3, within 7 days and within 30 days. If the event were eligible, numerator N7 and N30 would be true. But because the event is after Dec 1 cutoff, the member is not_eligible, and both met_7_day and met_30_day are false per instructions. Wait, the instruction: "For a member who is 'excluded' or 'not_eligible' under QM-FUM, report both as false." Indeed, even though the record shows a follow-up that would have met N7/N30, we must report false because not_eligible. The task says: "A member who never enters the denominator is 'not_eligible' even if a compliance event is present in the record." That refers to compliance event (numerator event) present. Here the follow-up visit is a compliance event present, but member never enters denominator, so not_eligible. And met_7_day and met_30_day false. Good.

Need check exclusions? Exclusions evaluated before numerator. But if not_eligible, no need. E1: ED visit discharged home, not inpatient/observation. Not excluded. E2: alive. But status not_eligible takes precedence. There's no qualifying ED visit in denominator. Let's verify age: DOB 1992-08-14. As of 2026-12-09, age 34. Fine.

Continuous enrolment: enrolment 2026-01-01 through 2026-12-31 continuous. Does the member have continuous enrolment from date of ED visit through 30 days after? The visit is 12-09. 30 days after is 2027-01-08. Enrolment ends 2026-12-31. So there is a gap (not enrolled in 2027). Thus continuous enrolment criterion also fails. This is another reason for not_eligible. Could the deciding criterion be enrolment? The task says reason should name the specific criterion or date that decided it. If there are multiple, pick the one? The event date after Dec 1 is a date criterion. The enrolment gap is because measurement year ends. Actually, the continuous enrolment requirement from date of ED visit through 30 days after: Since the member is only enrolled through 2026-12-31, and the ED visit is 2026-12-09, they are not continuously enrolled through 30 days after (which includes 2027-01-08). Therefore not eligible. But wait, the measure's eligible population says "Continuous enrolment: from the date of the emergency department visit through 30 days after, with no gaps." If the visit had been on or before Dec 1, 30 days after would be on or before Dec 31, so enrolment through 2026-12-31 would satisfy continuous enrolment. For a Dec 9 visit, 30 days after is Jan 8 2027, so enrolment through 2026-12-31 does NOT satisfy. So the member fails enrolment for the required 30-day follow-up window. But does the member even have an eligible event? The event date must be between Jan 1 and Dec 1. Since 12-09 is not in that range, the event is not a qualifying ED visit for the denominator. So the denominator event is absent. Which failure is primary? The specification says: "Event: an emergency department visit ... between 2026-01-01 and 2026-12-01. Visits after 2026-12-01 are excluded so the follow-up window can close inside the measurement year." That explicitly excludes the visit itself. So the visit is not counted. Therefore there is no denominator event at all. The member never enters denominator due to event date. The continuous enrolment is evaluated for a qualifying visit; if no qualifying visit, not eligible. The reason should mention the date/cutoff. That is clear.

Let's craft JSON:

{
  "status": "not_eligible",
  "reason": "The 2026-12-09 ED visit is after the 2026-12-01 denominator cutoff, so no qualifying event enters the denominator.",
  "met_7_day": false,
  "met_30_day": false
}

Check word count of reason: The(1) 2026-12-09(2) ED(3) visit(4) is(5) after(6) the(7) 2026-12-01(8) denominator(9) cutoff,(10) so(11) no(12) qualifying(13) event(14) enters(15) the(16) denominator.(17) Under 30. Good. Does it name the specific criterion or date? Yes, date 2026-12-09 and cutoff 2026-12-01. It says denominator cutoff. The criterion is the event date window (visits after 2026-12-01 excluded). Let's maybe say "event cutoff" instead of "denominator cutoff". Actually the cutoff is for the ED visit event. "The 2026-12-09 ED visit is after the 2026-12-01 event cutoff, so no qualifying visit enters the denominator." Word count: The(1) 2026-12-09(2) ED(3) visit(4) is(5) after(6) the(7) 2026-12-01(8) event(9) cutoff,(10) so(11) no(12) qualifying(13) visit(14) enters(15) the(16) denominator.(17) This names the criterion: event cutoff. Good.

But let's double-check the instruction: "reason string — one sentence, under 30 words, naming the specific criterion or date that decided it". The deciding date could be 2026-12-09 (visit after cutoff). It might be better: "The ED visit on 2026-12-09 is after the 2026-12-01 eligibility cutoff for denominator events." That's 17 words. Add "status not_eligible"? No, just reason. Let's choose: "The ED visit on 2026-12-09 is after the 2026-12-01 eligibility cutoff for denominator events." Wait, does it say why member not eligible? Yes, because visit after cutoff, so not eligible. Let's count: The(1) ED(2) visit(3) on(4) 2026-12-09(5) is(6) after(7) the(8) 2026-12-01(9) eligibility(10) cutoff(11) for(12) denominator(13) events.(14) Under 30. It names date and criterion. But maybe "eligibility cutoff" is vague. Use "event cutoff". Let's finalize reason: "The ED visit on 2026-12-09 is after the 2026-12-01 event cutoff, so the member is not eligible for the denominator." Count: The(1) ED(2) visit(3) on(4) 2026-12-09(5) is(6) after(7) the(8) 2026-12-01(9) event(10) cutoff,(11) so(12) the(13) member(14) is(15) not(16) eligible(17) for(18) the(19) denominator.(20) Good.

Need boolean false, not string. met_7_day: false, met_30_day: false.

Check if status should be "not_eligible" or "excluded"? Exclusions are E1/E2. The visit after cutoff is not an exclusion; it's an event eligibility criterion. The spec: "Visits after 2026-12-01 are excluded so the follow-up window can close inside the measurement year." The word "excluded" is used there! Wait: Read carefully: "Event: an emergency department visit with a principal mental health diagnosis (F01-F99, excluding F17.- tobacco use) between 2026-01-01 and 2026-12-01. Visits after 2026-12-01 are excluded so the follow-up window can close inside the measurement year. Each qualifying visit is counted separately."

It says "Visits after 2026-12-01 are excluded". But then in the Required Exclusions section, E1 and E2 are called "REQUIRED EXCLUSIONS". The task description says: "Exclusions are evaluated before the numerator. A member who meets both an exclusion and the numerator is 'excluded', not 'compliant'." And status values: "excluded" means "meets a required exclusion, so removed from the denominator". Wait! Important distinction: The word "excluded" in the event description ("Visits after 2026-12-01 are excluded") might mean those visits are not eligible events, i.e., not counted in the denominator. But the status "excluded" is defined as "meets a required exclusion, so removed from the denominator". The Required Exclusions are E1 (inpatient/observation) and E2 (death). The visits after Dec 1 are not "required exclusions" in the E1/E2 sense; they are simply not qualifying events, so the member never enters the denominator. The task says: "A member who never enters the denominator is 'not_eligible' even if a compliance event is present." And "Visits after 2026-12-01 are excluded so the follow-up window can close inside the measurement year." This is a denominator event exclusion at the visit level, not a member-level required exclusion. Since the member has only this visit, there is no visit that counts. Thus no denominator entry -> not_eligible. If there had been another qualifying visit earlier in the year, the member would be in denominator via that visit and the Dec 9 visit would be excluded from event counting. But here only one visit, after cutoff, so no event. So not_eligible is correct. The task's status definition: "not_eligible: never enters the denominator (age, event, or enrolment)". Event here: no ED visit in the eligible time window. Yes.

Check continuous enrolment: enrolment 2026-01-01 through 2026-12-31. That's continuous within measurement year. If the ED visit had been e.g. 2026-11-01, 30 days after is 2026-12-01, within enrolment, ok. But for Dec 9 visit, enrolment also fails. But the event date failure is enough.

Now ensure JSON keys exactly: status, reason, met_7_day, met_30_day. The required keys for task family: status, reason. Items drawn from QM-FUM require two further keys: met_7_day, met_30_day. So include all four. No extra keys. Use JSON null if told to leave empty; not needed.

Let's produce final answer as exactly one fenced JSON code block, no other text. Ensure code block has ```json and closing ```.

Double-check date format in reason: dates are ISO 8601 as given. We used 2026-12-09, 2026-12-01. Good.

Money? No.

Let's verify age calculation just in case: DOB 1992-08-14. As of 2026-12-09: Year difference 2026-1992 = 34. Since Dec is after Aug, age 34. At least 6. OK.

Check follow-up: 2026-12-12 office visit with psychiatric nurse practitioner. Is that a mental health practitioner? Yes, psychiatric nurse practitioner is a mental health practitioner. It is within 7 days? ED 12-09, day after 12-10 is day1. 12-12 is day3. Yes. Within 30 days? day3. So N7 true, N30 true. But because not_eligible, report both false. The instruction: "For a member who is 'excluded' or 'not_eligible' under QM-FUM, report both as false." This is explicit. So false.

One more nuance: The numerator says "A follow-up visit with a mental health practitioner within 7 days after the emergency department visit, counting the day after the visit as day 1." The office visit on 12-12 is 3 days after the ED visit (12-09 -> 12-12). Actually calendar days: 12-10 (1), 12-11 (2), 12-12 (3). Yes, day 3. So N7 met. And N30 met. But again false.

Could the status be "excluded" because E1? No, discharged home, not inpatient. E2? alive. So no required exclusion. The visit after cutoff is not a "required exclusion" per status definition. The status "excluded" is only for E1/E2. Indeed the measure spec has a section "REQUIRED EXCLUSIONS" with E1 and E2. The earlier text says "Visits after 2026-12-01 are excluded" but that is event/denominator eligibility, not the required exclusion status. The task says: "Exclusions are evaluated before the numerator. A member who meets both an exclusion and the numerator is 'excluded', not 'compliant'." This refers to required exclusions E1/E2. And "A member who never enters the denominator is 'not_eligible'". Since this member has no qualifying visit, never enters denominator. Yes.

Let's craft final exactly:

```json
{
  "status": "not_eligible",
  "reason": "The ED visit on 2026-12-09 is after the 2026-12-01 event cutoff, so the member is not eligible for the denominator.",
  "met_7_day": false,
  "met_30_day": false
}
```

Check reason word count: The(1) ED(2) visit(3) on(4) 2026-12-09(5) is(6) after(7) the(8) 2026-12-01(9) event(10) cutoff,(11) so(12) the(13) member(14) is(15) not(16) eligible(17) for(18) the(19) denominator.(20) <=30. Good. One sentence. Names specific date and criterion (event cutoff). Good.

Wait, does "event cutoff" name the criterion? The criterion is that visits after 2026-12-01 are excluded / event must be between Jan 1 and Dec 1. Maybe say "eligibility cutoff". But "event cutoff" is understandable. Maybe: "The ED visit on 2026-12-09 is after the 2026-12-01 eligibility cutoff for denominator events, so the member is not eligible." Count: The ED visit on 2026-12-09 is after the 2026-12-01 eligibility cutoff for denominator events, so the member is not eligible. Words: The(1) ED(2) visit(3) on(4) 2026-12-09(5) is(6) after(7) the(8) 2026-12-01(9) eligibility(10) cutoff(11) for(12) denominator(13) events,(14) so(15) the(16) member(17) is(18) n

We need answer JSON for QM-FUM.

We need parse specs. Measurement year 2026. Denominator: Age 6 or older as of date of ED visit. Event: ED visit with principal mental health diagnosis (F01-F99 excluding F17.- tobacco) between 2026-01-01 and 2026-12-01. Visits after 2026-12-01 are excluded so follow-up window can close inside measurement year. Each qualifying visit counted separately. Continuous enrolment: from date of ED visit through 30 days after, with no gaps.

Numerator: N7 follow-up within 7 days after ED visit, counting day after visit as day 1. N30 within 30 days after ED, counted same way. Same calendar day as ED doesn't count. Meeting N7 also meets N30.

Exclusions evaluated before numerator: E1 ED visit results in inpatient admission or observation stay of any length. Report visit excluded. E2 Death during 30 days following visit.

Member record: DOB 1992-08-14. Enrolment continuous 2026-01-01 through 12-31.
History:
2026-12-09 ED visit, principal diagnosis F32.9. Discharged home.
2026-12-12 Office visit with psychiatric nurse practitioner (mental health practitioner presumably). Alive throughout.

We need determine status.

ED visit date 2026-12-09. Is it between 2026-01-01 and 2026-12-01? Wait: The denominator event: between 2026-01-01 and 2026-12-01. "Visits after 2026-12-01 are excluded so the follow-up window can close inside the measurement year." Need parse "between 2026-01-01 and 2026-12-01". Does this include 2026-12-01? Usually inclusive maybe. But our visit is 2026-12-09, which is after 2026-12-01. So this visit is excluded from denominator because visits after 2026-12-01 are excluded. Therefore never enters denominator? Let's examine carefully.

The event criterion: "an emergency department visit with a principal mental health diagnosis ... between 2026-01-01 and 2026-12-01. Visits after 2026-12-01 are excluded so the follow-up window can close inside the measurement year." Since visit is 2026-12-09, it's after 2026-12-01, so it's excluded from denominator. Thus member is not_eligible? Wait, eligibility requires the qualifying event within window. There is no other qualifying ED visit. Continuous enrolment is fine. Age: in 2026, DOB 1992-08-14, as of 2026-12-09 age 34, >6. But no qualifying ED visit in window, so denominator not met. The spec says Event: an ED visit ... between 2026-01-01 and 2026-12-01. Visits after 2026-12-01 are excluded. So the 12-09 visit is not a denominator event. Therefore member never enters denominator: status "not_eligible". Required for QM-FUM: met_7_day and met_30_day both false for excluded or not_eligible. Since not_eligible, both false.

But need check if the measure counts each qualifying visit separately; the 12-09 ED visit is non-qualifying due to date. Is there any possibility that the window is through 2026-12-01, inclusive, and the visit is after, so no. Could the follow-up window close inside the measurement year? Let's calculate: ED 12-09, 30 days after = 2027-01-08. That is outside measurement year 2026, so that's why after 12-01 excluded. So yes.

Potential subtlety: The numerator: follow-up visit 2026-12-12 is 3 days after ED (day after is day1, so 12-10 day1, 12-11 day2, 12-12 day3) within 7 days. If the ED visit were qualifying, N7 true, N30 true, not excluded, compliant. But because event date after 12-01, the visit isn't in denominator, so not_eligible. And the rules say "A member who never enters the denominator is 'not_eligible' even if a compliance event is present in the record." This is exactly that case: compliance event (follow-up visit) present but ED after window. So status not_eligible.

Need reason: one sentence under 30 words naming specific criterion or date that decided it. Something like: "The 2026-12-09 ED visit falls after the 2026-12-01 denominator cutoff, so it does not qualify." Count words: The(1) 2026-12-09(2) ED(3) visit(4) falls(5) after(6) the(7) 2026-12-01(8) denominator(9) cutoff,(10) so(11) it(12) does(13) not(14) qualify.(15) Under 30. Good. Or: "ED visit on 2026-12-09 is after the 2026-12-01 event cutoff, so no qualifying visit enters the denominator." Count: ED1 visit2 on3 2026-12-09? Let's just produce: "The 2026-12-09 ED visit is after the 2026-12-01 denominator cutoff, so it is not a qualifying event." Check word count: The1 2026-12-09? Might count as one word? Usually tokens: "The"1 "2026-12-09"2 "ED"3 "visit"4 "is"5 "after"6 "the"7 "2026-12-01"8 "denominator"9 "cutoff,"10 "so"11 "it"12 "is"13 "not"14 "a"15 "qualifying"16 "event."17 Under 30. Good.

Need JSON keys:
"status": "not_eligible"
"reason": "..."
"met_7_day": false
"met_30_day": false

Need ensure exactly one fenced JSON code block, nothing else. Use null? No, booleans false. No extra keys.

Double-check exclusions: E1? ED discharged home, no inpatient/observation. E2? Alive throughout. So no exclusion. But status not_eligible due to no denominator event. The spec says "Visits after 2026-12-01 are excluded so the follow-up window can close inside the measurement year." Wait, it says "excluded" maybe could mean the visit is excluded from the denominator, i.e., member not in denominator? The status categories: compliant, non_compliant, excluded, not_eligible. The phrase "Visits after 2026-12-01 are excluded" could be interpreted as an exclusion (E?) making the member "excluded"? Need parse carefully.

The measure QM-FUM: Eligible population (denominator): Age, Event: an ED visit ... between 2026-01-01 and 2026-12-01. Visits after 2026-12-01 are excluded so the follow-up window can close inside the measurement year. Each qualifying visit is counted separately. Continuous enrolment...

Then Numerator. Then Required Exclusions: E1 ED results in inpatient admission or observation stay. E2 Death during 30 days following visit.

The "visits after 2026-12-01 are excluded" is part of the denominator event definition, not listed under "Required Exclusions" E1/E2. The status "excluded" is defined as "meets a required exclusion, so removed from the denominator". Required exclusions are E1 and E2 only. The date cutoff is a denominator eligibility criterion: if no ED visit in the allowed window, member not_eligible. The wording: "Visits after 2026-12-01 are excluded" might mislead into status excluded. But the task description says: "status: 'excluded' meets a required exclusion, so removed from the denominator". Then later: "A member who never enters the denominator is 'not_eligible' even if a compliance event is present in the record." Also: "A member who meets both an exclusion and the numerator is 'excluded', not 'compliant'." And "A member who never enters the denominator is 'not_eligible' even if a compliance event is present." The task family says "Exclusions are evaluated before the numerator." The measures list "REQUIRED EXCLUSIONS" which are E1 and E2. The date restriction is in denominator event, so not meeting it means never enters denominator => not_eligible. They even explicitly gave example: "A member who never enters the denominator is 'not_eligible' even if a compliance event is present in the record." The record has an ED visit after cutoff and a follow-up visit (compliance event). That's exactly the scenario they warned about. So not_eligible is correct.

But let's verify the follow-up visit: It is with a psychiatric nurse practitioner. Is psychiatric nurse practitioner a mental health practitioner? In HEDIS FUH (Follow-Up After Emergency Department Visit for Mental Illness), mental health practitioner includes psychiatrist, psychiatric nurse practitioner? Actually in HEDIS, "mental health practitioner" includes psychiatrist, psychiatric nurse practitioner, clinical psychologist, licensed clinical social worker, etc? In HEDIS FUH, follow-up visit with a mental health practitioner: includes psychiatrists, psychiatric nurses, etc. The prompt says "psychiatric nurse practitioner". That likely counts as mental health practitioner. But since not_eligible, met_7_day and met_30_day are false anyway. We don't need to decide practitioner? The task says for excluded/not_eligible under QM-FUM, report both as false. So booleans false.

Need reason mention specific criterion or date. It should name the date 2026-12-01 cutoff or that visit after cutoff. The reason: "The 2026-12-09 ED visit is after the 2026-12-01 denominator cutoff, so it is not a qualifying event." Let's word count strictly: "The" (1) "2026-12-09" (2) "ED" (3) "visit" (4) "is" (5) "after" (6) "the" (7) "2026-12-01" (8) "denominator" (9) "cutoff," (10) "so" (11) "it" (12) "is" (13) "not" (14) "a" (15) "qualifying" (16) "event." (17). That's fine.

Need ensure JSON string escaping: reason contains no double quotes. Good.

Double-check continuous enrolment: from date of ED visit through 30 days after. Enrolment is 2026-01-01 through 2026-12-31 continuous. If ED visit were 12-09, 30 days after is 2027-01-08, which is beyond enrolment (enrolment ends 12-31). But the continuous enrolment criterion applies from date of ED visit through 30 days after, with no gaps. Since visit not in denominator (date after cutoff), enrolment criterion is irrelevant? Actually if the visit doesn't qualify, no need. Suppose we considered qualifying? The visit after cutoff is excluded, so no. If it were qualifying, enrolment would fail because need coverage through 30 days after (2027-01-08) but enrolment ends 2026-12-31. Wait, this is another reason maybe not eligible or excluded? Let's check: The continuous enrolment criterion: "from the date of the emergency department visit through 30 days after, with no gaps." The member is enrolled through 2026-12-31 only. If ED visit on 2026-12-09, 30 days after is 2027-01-08. There is a gap after 12-31 through 01-08 (well enrolment ends, not continuous through 30 days after). So even if the visit were within the date window? Actually the visit is 12-09, which is after 12-01, but also enrolment does not extend 30 days after (to 2027-01-08). This is another eligibility failure. Wait, measurement year is 2026-01-01 through 2026-12-31. The continuous enrolment requirement is "from the date of the emergency department visit through 30 days after". Since measurement year ends 12-31, any ED visit after 2026-12-01 would require enrolment into 2027 to have 30 days continuous; but the record only shows enrolment 2026-01-01 through 2026-12-31. So both the event date cutoff and the enrolment criterion indicate not eligible. The spec explicitly says visits after 2026-12-01 are excluded so follow-up window can close inside measurement year. This implies for visits up to 12-01, 30 days after is up to 12-31, which fits in measurement year. For 12-09, 30 days after 2027-01-08, outside measurement year and enrolment. The record's enrolment ends 12-31, so there is a gap for the required 30 days after. But the primary explicit criterion is the event date window: only ED visit is after 12-01, so not a qualifying event. We should name the date that decided it: 2026-12-09 after 2026-12-01 cutoff OR lack of continuous enrollment through 2027-01-08? The task says "naming the specific criterion or date that decided it". We can name either. Which is more directly the reason? Since the only ED visit is 2026-12-09, the event date is after the allowed window (2026-12-01), so it does not qualify. That's crisp. But we might also mention enrolment: Actually if we look at denominator requirements: age ok; event: ED visit between 2026-01-01 and 2026-12-01. The visit is 12-09, not in that range, so event criterion fails. Continuous enrolment: not evaluated? The spec says continuous enrolment from date of ED visit through 30 days after. If the visit is not a qualifying event, do we still require enrolment? It says eligible population includes continuous enrolment. If no qualifying event, not in denominator. The most specific deciding criterion is event date. But note the enrolment span 2026-01-01 to 2026-12-31; if we consider continuous enrolment for the period 12-09 through 30 days after (to 01-08), it fails. Could that be the reason? Which one did the test intend? Let's re-read prompt: "Visits after 2026-12-01 are excluded so the follow-up window can close inside the measurement year." This is a clear statement that a 12-09 visit is excluded. The measure's denominator event criterion demands date between 2026-01-01 and 2026-12-01. So the visit after that is not a denominator event. The member never enters denominator, status not_eligible. The follow-up on 12-12 is a compliance event but irrelevant. The task even says: "A member who never enters the denominator is 'not_eligible' even if a compliance event is present in the record." That's exactly this: compliance event present (office visit with psych NP) but ED visit after cutoff. So they intend not_eligible. The reason should reflect that the ED visit is after the cutoff, not a qualifying event. Good.

Let's ensure no possibility of status "excluded" because the visit after 12-01 is "excluded". The status "excluded" is reserved for required exclusions E1 and E2. The date criterion is not in required exclusions; it's in denominator event. The prompt: "REQUIRED EXCLUSIONS E1... E2..." The date restriction is in ELIGIBLE POPULATION. So not_eligible.

Need output JSON:
{
  "status": "not_eligible",
  "reason": "The 2026-12-09 ED visit is after the 2026-12-01 denominator cutoff, so it is not a qualifying event.",
  "met_7_day": false,
  "met_30_day": false
}

Check reason length: The sentence has 17 words, under 30. Good.

Wait, the required keys for tasks drawn from measure QM-FUM require two further keys met_7_day and met_30_day. Yes. For not_eligible, report both as false.

Let's ensure JSON boolean lowercase false.

Now final answer exactly one fenced JSON code block and nothing else. No preamble, no commentary. Use ```json ... ```.

Need be careful about "2026-12-09" token maybe considered two words? Doesn't matter; total words under 30.

Let's craft final.

Potential issue: "counting the day after the visit as day 1" for N7/N30. But false.

Let's produce final.

The user wants me to evaluate a member record against the QM-FUM (Follow-Up After an Emergency Department Visit for Mental Illness) measure specification.

Let me break down the information:

**Measure QM-FUM:**
- Measurement year: 2026-01-01 through 2026-12-31

**Eligible Population (Denominator):**
1. Age: 6 years or older as of the date of the ED visit.
2. Event: ED visit with principal mental health diagnosis (F01-F99, excluding F17.-) between 2026-01-01 and 2026-12-01. Visits after 2026-12-01 are excluded.
3. Continuous enrollment: from ED visit date through 30 days after, with no gaps.

**Numerator:**
- N7: Follow-up visit with mental health practitioner within 7 days after ED visit (day after = day 1)
- N30: Follow-up visit with mental health practitioner within 30 days after ED visit (day after = day 1)
- Same calendar day doesn't count.
- Meeting N7 also meets N30.

**Required Exclusions:**
- E1: ED visit results in inpatient admission or observation stay of any length.
- E2: Death during 30 days following the visit.

**Member Record:**
- MEMBER 40406
- DOB: 1992-08-14
- Enrollment: 2026-01-01 through 2026-12-31, continuous
- History:
  - 2026-12-09: ED visit, principal diagnosis F32.9. Discharged home.
  - 2026-12-12: Office visit with psychiatric nurse practitioner.
- Alive throughout.

**Step-by-step analysis:**

1. **Check Denominator Eligibility:**
   - ED visit date: 2026-12-09
   - Age as of 2026-12-09: Born 1992-08-14, so on 2026-12-09 they are 34 years old. > 6 years. Pass.
   - Diagnosis: F32.9 is within F01-F99 and is not F17.-. Pass.
   - Event date: 2026-12-09. Is this between 2026-01-01 and 2026-12-01? 
     - 2026-12-09 is AFTER 2026-12-01. The spec says: "Visits after 2026-12-01 are excluded so the follow-up window can close inside the measurement year."
     - Wait, this means visits after 2026-12-01 are excluded from the denominator? Let me re-read: "Event: an emergency department visit with a principal mental health diagnosis (F01-F99, excluding F17.- tobacco use) between 2026-01-01 and 2026-12-01. Visits after 2026-12-01 are excluded so the follow-up window can close inside the measurement year."
     - So the visit must be between 2026-01-01 and 2026-12-01 inclusive? Or exclusive? The text says "between 2026-01-01 and 2026-12-01" and then "Visits after 2026-12-01 are excluded". So the cutoff is 2026-12-01. A visit on 2026-12-09 is after 2026-12-01, so it does NOT fall within the eligible date range for the event.
     - Wait, but there's also the continuous enrollment requirement: "from the date of the emergency department visit through 30 days after". If the visit is on 2026-12-09, 30 days after is 2027-01-08, which is outside the measurement year. But the spec explicitly says visits after 2026-12-01 are excluded so the follow-up window can close inside the measurement year.
     - So the visit on 2026-12-09 is after 2026-12-01. Therefore, the member is NOT eligible for the denominator because the event date is outside the allowed range.
     - Status should be "not_eligible".

2. **Double-check:** 
   - Wait, could "between 2026-01-01 and 2026-12-01" mean through 2026-12-01? Yes, and 2026-12-09 is after that, so it's outside the range.
   - The spec says: "Event: an emergency department visit ... between 2026-01-01 and 2026-12-01. Visits after 2026-12-01 are excluded..."
   - This clearly means 2026-12-09 does not qualify as a denominator event.
   - Therefore the member is "not_eligible".
   - Even though there is a compliance event (office visit on 2026-12-12), the task says: "A member who never enters the denominator is 'not_eligible' even if a compliance event is present in the record."
   - For QM-FUM, when not_eligible, report met_7_day and met_30_day as false.

3. **Keys to return:**
   - status: "not_eligible"
   - reason: one sentence under 30 words naming the specific criterion or date that decided it.
   - met_7_day: false
   - met_30_day: false

4. **Reason formulation:**
   - "ED visit on 2026-12-09 is after the 2026-12-01 cutoff." 
   - Count words: ED(1) visit(2) on(3) 2026-12-09(4) is(5) after(6) the(7) 2026-12-01(8) cutoff(9). = 9 words. Good.
   - Or: "Emergency department visit occurred after 2026-12-01 denominator date range." 
   - Count: Emergency(1) department(2) visit(3) occurred(4) after(5) 2026-12-01(6) denominator(7) date(8) range(9). = 9 words. Good.
   - Or just: "ED visit date 2026-12-09 falls after 2026-12-01." = 7 words.

5. **Check if any exclusions apply?**
   - No need since not in denominator.

6. **Check numerator timing just in case (though not needed for status):**
   - ED: 2026-12-09
   - Follow-up: 2026-12-12
   - Day after ED = 2026-12-10 (day 1)
   - 2026-12-11 = day 2
   - 2026-12-12 = day 3
   - So within 7 days? Yes, day 3.
   - Within 30 days? Yes.
   - But since the ED visit itself is not a qualifying denominator event due to date, the member is not eligible.

7. **Final JSON:**
   ```json
   {
     "status": "not_eligible",
     "reason": "ED visit date 2026-12-09 falls after 2026-12-01.",
     "met_7_day": false,
     "met_30_day": false
   }
   ```

Wait, let me re-read carefully: "Event: an emergency department visit with a principal mental health diagnosis (F01-F99, excluding F17.- tobacco use) between 2026-01-01 and 2026-12-01. Visits after 2026-12-01 are excluded so the follow-up window can close inside the measurement year. Each qualifying visit is counted separately."

Yes, 2026-12-09 is after 2026-12-01. The member is not eligible.

One more check: is there any ambiguity about whether the visit is "excluded" vs "not_eligible"? 
- The visit after 2026-12-01 means it doesn't meet the event criterion for the denominator. The spec lists this under "Eligible Population (denominator)". The "Required Exclusions" are E1 and E2 only. The date restriction is part of the denominator definition, not an exclusion. So "not_eligible" is correct, not "excluded".

Also check age: 6 years or older. Member is 34. Fine.
Enrollment: continuous through 30 days after? Visit on 2026-12-09, 30 days after is 2026-01-08 (2027), but enrollment ends 2026-12-31. So actually, they are NOT continuously enrolled for 30 days after because the enrollment ends before the 30-day window closes. But we already know the event date disqualifies them. However, if I had to check enrollment: "from the date of the emergency department visit through 30 days after, with no gaps." Enrolled through 2026-12-31. 30 days after 2026-12-09 is 2027-01-08. So there is a gap from 2027-01-01 to 2027-01-08. Actually, the enrollment ends 2026-12-31. The requirement is continuous enrollment through 30 days after the visit. Since the measurement year is through 2026-12-31, is the enrollment requirement only within the measurement year? The spec says "Continuous enrolment: from the date of the emergency department visit through 30 days after, with no gaps." It doesn't say the enrollment must extend beyond the measurement year, but logically if the 30-day window extends beyond the measurement year and enrollment ends at 12-31, there could be a question. But the spec explicitly says visits after 2026-12-01 are excluded so the follow-up window can close inside the measurement year. This implies that for visits on or before 2026-12-01, the 30-day window (ending on or before 2026-12-31) closes inside the measurement year. For a visit on 2026-12-09, the window extends to 2027-01-08, outside the measurement year. But the reason for the 2026-12-01 cutoff is specifically to keep the follow-up window inside the measurement year. So the visit on 2026-12-09 fails the event date criterion.

Even if we ignored the date cutoff, the enrollment might not be continuous through 30 days after if the plan only covers through 2026-12-31. But the task says "Enrolment: 2026-01-01 through 2026-12-31, continuous." This is given as the member's enrollment. If the denominator requires continuous enrollment from the ED visit through 30 days after, and the enrollment ends at 12-31, then for a 12-09 visit, the 30 days after ends 1-8-2027, so there is a gap. But again, the date cutoff makes this moot.

Actually, looking at the prompt again: "Each qualifying visit is counted separately." But the visit on 2026-12-09 is not qualifying because of the date.

So my answer is solid.

Let me check the exact wording constraints for the reason: "one sentence, under 30 words, naming the specific criterion or date that decided it".

"ED visit date 2026-12-09 falls after 2026-12-01." - 9 words. Perfect.

Final check on JSON format:
- Exactly one fenced JSON code block
- No preamble or commentary
- Keys: status, reason, met_7_day, met_30_day
- Values: string, string, boolean, boolean

Looks good.

The user wants me to evaluate a member against the QM-FUM measure specification.

Let me break down the member record:
- Member 40406
- DOB: 1992-08-14
- Enrollment: 2026-01-01 through 2026-12-31, continuous
- History:
  - 2026-12-09: ED visit, principal diagnosis F32.9 (Major depressive disorder, single episode, unspecified). Discharged home.
  - 2026-12-12: Office visit with a psychiatric nurse practitioner.
- Alive throughout.

Now let me check the measure QM-FUM criteria:

Denominator:
1. Age: 6 years or older as of the date of the ED visit.
   - DOB: 1992-08-14. ED visit: 2026-12-09.
   - Age on 2026-12-09: 2026 - 1992 = 34 years old. Definitely ≥ 6 years.

2. Event: ED visit with principal mental health diagnosis (F01-F99, excluding F17.-) between 2026-01-01 and 2026-12-01.
   - ED visit date: 2026-12-09.
   - Wait, the event must be between 2026-01-01 and 2026-12-01. Visits after 2026-12-01 are excluded so the follow-up window can close inside the measurement year.
   - 2026-12-09 is AFTER 2026-12-01.
   - Therefore, this ED visit does not qualify for the denominator because it is not between 2026-01-01 and 2026-12-01 inclusive? Let me re-read: "between 2026-01-01 and 2026-12-01. Visits after 2026-12-01 are excluded..."
   - The event window ends on 2026-12-01. The visit on 2026-12-09 is after 2026-12-01, so the 30-day follow-up window (ending 2027-01-08) would close outside the measurement year? Wait, the measurement year is through 2026-12-31. But the continuous enrollment requirement is from the date of the ED visit through 30 days after. The event specification says the visit must be between 2026-01-01 and 2026-12-01 so the follow-up window can close inside the measurement year. So 2026-12-09 is outside the allowed event window.

Wait, actually, if the visit is on 2026-12-09, the 30-day follow-up window ends on 2027-01-08 (if counting day after as day 1: Dec 10 is day 1, Dec 11 day 2, ..., Jan 8 is day 30). But the measurement year ends 2026-12-31. However, the continuous enrollment requirement says "from the date of the emergency department visit through 30 days after, with no gaps." The member is enrolled through 2026-12-31, but 30 days after Dec 9 is Jan 8, which is outside the enrollment period? Actually, the enrollment record says 2026-01-01 through 2026-12-31. The continuous enrollment requirement requires enrollment through 30 days after the visit. Since the visit is Dec 9, 30 days after is Jan 8, 2027. But enrollment ends Dec 31, 2026. So there would be a gap in enrollment from Jan 1 to Jan 8? The prompt says "Enrolment: 2026-01-01 through 2026-12-31, continuous." So from the date of the visit (Dec 9) through 30 days after (Jan 8), there IS a gap because enrollment ends Dec 31.

Wait, but the event criterion itself excludes visits after 2026-12-01. The visit is on 2026-12-09. So the member is not eligible because the ED visit is outside the specified event window. The prompt says: "Event: an emergency department visit with a principal mental health diagnosis (F01-F99, excluding F17.-) between 2026-01-01 and 2026-12-01. Visits after 2026-12-01 are excluded so the follow-up window can close inside the measurement year."

So the visit on 2026-12-09 is not within the date range [2026-01-01, 2026-12-01]. Therefore, the member never enters the denominator.

Status should be "not_eligible".
Reason: something like "ED visit occurred after 2026-12-01." or "ED visit on 2026-12-09 is outside the measurement window."
Wait: "not_eligible" is for never entering the denominator. This is because the event date is outside the required window. The date that decided it is 2026-12-09, or the fact that it is outside the window.

Actually, let me double-check the exact wording: "Event: an emergency department visit with a principal mental health diagnosis ... between 2026-01-01 and 2026-12-01."
"Visits after 2026-12-01 are excluded so the follow-up window can close inside the measurement year." 
This means visits after Dec 1 are not eligible events.

Also, enrollment: "Continuous enrolment: from the date of the emergency department visit through 30 days after, with no gaps." Since the visit is Dec 9, the 30 days after would be Jan 8. Enrollment ends Dec 31. So there is a gap. But the event criterion already disqualifies the visit, so the enrollment issue is moot.

Since the member doesn't enter the denominator, they are "not_eligible".
For QM-FUM, for excluded or not_eligible, report both met_7_day and met_30_day as false.

Let me verify if there's any trick. The date 2026-12-09 is after 2026-12-01. So the event criterion fails. This makes the member "not_eligible". Even though the member has a follow-up visit on Dec 12 (which would be within 7 days if the ED visit counted), it doesn't matter because the denominator entry failed.

So:
status: "not_eligible"
reason: "ED visit on 2026-12-09 occurred after the allowed event window ending 2026-12-01." 
Wait, I need to keep it under 30 words.
"ED visit on 2026-12-09 falls outside the eligible event window ending 2026-12-01." Let's count: 1-ED 2-visit 3-on 4-2026-12-09 5-falls 6-outside 7-the 8-eligible 9-event 10-window 11-ending 12-2026-12-01. 12 words. Good.

Keys required:
"status": "not_eligible"
"reason": "ED visit on 2026-12-09 falls outside the eligible event window ending 2026-12-01."
"met_7_day": false
"met_30_day": false

Is the psychiatric nurse practitioner a "mental health practitioner"? The measure says "follow-up visit with a mental health practitioner". This usually includes psychiatric nurse practitioners. But it doesn't matter because the member is not eligible.

Wait, the prompt explicitly says: "A member who never enters the denominator is 'not_eligible' even if a compliance event is present in the record." Here, the compliance event (follow-up visit) is present, but the denominator entry event (ED visit) is outside the window. So not_eligible is correct.

One final check: Age is fine. Diagnosis F32.9 is in F01-F99 and not F17. But date is wrong.

What about continuous enrollment gap? The enrollment ends 2026-12-31. The visit is 2026-12-09. 30 days after is 2027-01-08. So there is a gap in enrollment from 2027-01-01 to 2027-01-08. The measure says "Continuous enrolment: from the date of the emergency department visit through 30 days after, with no gaps." Since enrollment is only through 2026-12-31, there is a gap. So even if the date were eligible (e.g., Dec 1), continuous enrollment through Jan 1-30 would fail? Actually, if ED visit was Dec 1, 30 days after is Dec 31. Enrollment through Dec 31 would satisfy it. But for Dec 9, it fails both event date and continuous enrollment. However, the event date is the more direct reason. I'll cite the event date as the deciding factor.

The prompt asks for the specific criterion or date that decided it. I should mention both?
"ED visit on 2026-12-09 is after the latest eligible date of 2026-12-01."
That's 11 words. Good.

Double check: "not_eligible" status. Yes.

JSON format required exactly.

```json
{
  "status": "not_eligible",
  "reason": "ED visit on 2026-12-09 is after the latest eligible date of 2026-12-01.",
  "met_7_day": false,
  "met_30_day": false
}
```

Wait, is it possible that "between 2026-01-01 and 2026-12-01" is inclusive? Yes, typically "between" in these measures is inclusive. But Dec 9 is after Dec 1, so definitely outside.

Alright, this looks solid.