Qualifying encounter falls after the event window

**My Thought Process for Determining Eligibility for QM-CBP**

My primary task here is to evaluate a member's eligibility for the QM-CBP (Blood Pressure Control in Hypertension) measure for the 2026 measurement year. This involves meticulously checking a set of criteria to determine if they fall into the denominator.

First, I need to confirm their age. The criteria state that the member must be between 18 and 85 years old as of December 31, 2026. I see the member's date of birth is November 11, 1975. Calculating this, on December 31, 2026, they will be 51 years old. This clearly falls within the acceptable age range, so they pass this initial check.

Next, and critically, I need to establish if they meet the "event" criteria. The measure requires at least one outpatient encounter with a hypertension diagnosis (ICD-10 code I10) occurring between January 1, 2026, and June 30, 2026. I'm presented with two encounters: one on August 19, 2026, with diagnosis I10 and a blood pressure reading of 138/86, and another on November 4, 2026, also with diagnosis I10 and a blood pressure reading of 130/80.

Upon reviewing these dates, I realize a significant issue. *Neither* of these encounters falls within the specified Jan-Jun 2026 window. The earliest encounter is in August, which is after the June 30th cut-off. The measure explicitly states that an encounter *after* June 30, 2026, does *not* establish the qualifying event. Therefore, based on the provided encounter data, this member has *not* met the event requirement.

The third criterion is continuous enrollment for the *entire* measurement year. The provided information indicates they are continuously enrolled, which is good, but it's irrelevant if they don't meet the event criteria.

Because the member has not had a qualifying event (an outpatient encounter with an I10 diagnosis) during the designated period (January 1, 2026, to June 30, 2026), they are not eligible for inclusion in the denominator for this measure. My immediate conclusion is that their status should be "not_eligible."

Now, I need to articulate the precise reason for this ineligibility. The core issue is the absence of the qualifying encounter in the specified timeframe. I need to craft a clear and concise reason, adhering to any length constraints if they exist (though none were explicitly mentioned for the reason itself, I'll aim for brevity).

I'll draft the reason as: "The member had no outpatient encounter with a hypertension diagnosis on or between 2026-01-01 and 2026-06-30." This accurately reflects the situation and is under 30 words. I'll refine it slightly to "The member did not have an outpatient encounter with a hypertension diagnosis between 2026-01-01 and 2026-06-30" for even better flow, which is 17 words.

Finally, I need to ensure the output format is correct. It requires a single fenced JSON block with only two keys: "status" and "reason." I will construct this JSON object with the determined values. I will also double-check that no other data points or keys are included, as the instructions are quite specific about this. I've confirmed there are no missing QM-FUM requirements, as this is specifically QM-CBP.

So, the final JSON output will be:

```json
{
  "status": "not_eligible",
  "reason": "The member did not have an outpatient encounter with a hypertension diagnosis between 2026-01-01 and 2026-06-30."
}
```
This JSON accurately captures my determined status and the precise reason for the member's ineligibility for QM-CBP, based on a thorough review of the provided criteria and data.

**My Thought Process for Evaluating Member 40117 Against QM-CBP for Measurement Year 2026**

My primary task here is to determine the eligibility status of MEMBER 40117 for the quality measure QM-CBP during the measurement year 2026, which spans from January 1, 2026, to December 31, 2026. I need to do this by meticulously checking several criteria.

First, I focused on the **eligible population criteria**, specifically the denominator. This involves two main components: age and a qualifying event.
For age, the requirement is to be between 18 and 85 years old as of December 31, 2026. The member's date of birth is November 11, 1975. A quick calculation shows that on December 31, 2026, they will be 51 years old. This comfortably falls within the specified age range, so this criterion is met.

The next, and more critical, part of the denominator is the qualifying event. The measure specifies "at least one outpatient encounter with a hypertension diagnosis (I10) on or between January 1, 2026, and June 30, 2026." I reviewed the provided encounter data. I see two relevant encounters: one on August 19, 2026, and another on November 4, 2026, both listing I10 as a diagnosis.

Here's where my detailed analysis kicked in: the measure is very clear about the timing of this event. It *must* occur within the first half of the measurement year. Since both of the member's outpatient encounters with a hypertension diagnosis fall *after* June 30, 2026, they do not satisfy this crucial event criterion. The logic is straightforward: an encounter that happens after the defined window simply doesn't count for establishing this specific event. Therefore, the member fails to meet the denominator event requirement.

Second, I checked the **enrolment criteria**. The requirement is continuous enrolment from January 1, 2026, through December 31, 2026. The provided information confirms that the member was continuously enrolled throughout this entire period, so this criterion is met.

Third, based on the failure to meet the denominator event criterion, I concluded that the member's **status** is "not_eligible."

Fourth, I formulated the **reason** for this determination. It needs to be concise and clearly state the unmet criterion. My initial thought was to simply state that there was no hypertension encounter in the required period. However, refining it to be more precise, I arrived at: "Member is not eligible because there is no outpatient encounter with a hypertension diagnosis on or between 2026-01-01 and 2026-06-30." I then checked the word count to ensure it fit the constraint of being under 30 words (it's 22 words) and that it clearly identified the specific date range and diagnosis that led to the decision.

Finally, I confirmed that the output should be in JSON format and that only keys relevant to QM-CBP are needed. I noted that there were specific keys mentioned for QM-FUM ("met_7_day", "met_30_day") but explicitly dismissed them because the current measure is QM-CBP. I also ran through other common exclusions (hospice, pregnancy, dialysis, death) to ensure none of those applied, and the provided information indicated they did not.

Therefore, my final JSON output reflects a "not_eligible" status with the precise reason based on the missed denominator event timing.

**My Thought Process for Member 40117 and QM-CBP**

Alright, let's break down this member's eligibility for the QM-CBP measure. My primary goal is to determine their status and provide a concise, accurate reason.

First, I've identified the measure as QM-CBP, focusing on Blood Pressure Control in Hypertension for the measurement year 2026. I've also noted the age range (18-85 on 2026-12-31), the critical denominator criteria, and the numerator requirements, along with the exclusion criteria.

Now, I'm looking at Member 40117. Their DOB is 1975-11-11. As of 2026-12-31, they'll be 51 years old. This comfortably falls within the 18-85 age range, so that's met. Their enrollment is continuous for the entire measurement year, 2026-01-01 to 2026-12-31, which also satisfies the continuous enrollment requirement.

The core of this measure hinges on a specific event: "at least one outpatient encounter with diagnosis I10 between 2026-01-01 and 2026-06-30." This is the gateway to being considered for the denominator.

I've reviewed the member's encounters:
*   2026-08-19: Office visit, I10, BP 138/86.
*   2026-11-04: Office visit, I10, BP 130/80.

Here's where the problem lies: both of these encounters, while having the I10 diagnosis, occurred *after* the specified timeframe of 2026-06-30. The measure explicitly states that an encounter after 2026-06-30 does *not* establish the required event for the denominator.

Because Member 40117 does not have a qualifying hypertension encounter within the critical first half of the measurement year (2026-01-01 to 2026-06-30), they simply do not enter the denominator for this measure. They are not eligible to be evaluated further.

Therefore, the status for this member is **`not_eligible`**.

The reason needs to be clear and concise, referencing the unmet criterion. I've considered a few phrasing options, aiming for under 30 words and specifying the exact requirement that was missed.

My final choice for the reason is: "The member had no outpatient encounter with a hypertension diagnosis (I10) on or between 2026-01-01 and 2026-06-30." This is 16 words, directly addresses the failed event criterion and the specific date range.

I've also confirmed that no additional QM-FUM specific keys like 'met_7_day' or 'met_30_day' are required for this QM-CBP assessment, as per the instructions. The JSON output should only include 'status' and 'reason'.

Thus, the resulting JSON is:
```json
{
  "status": "not_eligible",
  "reason": "The member had no outpatient encounter with a hypertension diagnosis (I10) on or between 2026-01-01 and 2026-06-30."
}
```

**My Thought Process on Member 40117 for the QM-CBP Measure**

When approaching this QM-CBP (Blood Pressure Control in Hypertension) measure for the 2026 measurement year, my primary objective is to determine if member 40117 qualifies for inclusion and, if so, whether they meet the criteria for compliance. My process begins by meticulously examining the measure's definition and then applying it to the specific data for this member.

First, I confirmed the measurement period: January 1, 2026, through December 31, 2026. The core of the measure revolves around meeting specific denominator criteria and then the numerator.

Let's break down the denominator requirements for member 40117:

1.  **Age:** The member's date of birth is November 11, 1975. As of December 31, 2026, they would be 51 years old (2026 - 1975 = 51). This comfortably falls within the specified age range of 18-85. So, this criterion is met.

2.  **Enrolment:** The member must have had full measurement year enrolment, with a maximum of one gap of 45 days. The data indicates full enrolment from January 1, 2026, through December 31, 2026, with no gaps. This criterion is also met.

3.  **Event:** This is where things get critical. The measure requires "at least one outpatient encounter with a hypertension diagnosis (I10) between January 1, 2026, and June 30, 2026." I reviewed the member's encounter history:
    *   An encounter occurred on August 19, 2026, with an I10 diagnosis and a BP reading of 138/86.
    *   Another encounter occurred on November 4, 2026, with an I10 diagnosis and a BP reading of 130/80.

    Crucially, both of these encounters with the hypertension diagnosis occurred *after* the specified window for establishing the "event" (which closes on June 30, 2026). The measure clearly states that an encounter *after* this date does not establish the event. Therefore, the member *did not* meet the denominator's "event" requirement.

Because the member failed to meet a fundamental denominator requirement – specifically, the qualifying hypertension encounter within the defined initial period – they never enter the eligible population (the denominator) for this measure. This immediately flags them as "not_eligible."

I then considered the exclusions: ESRD, dialysis, pregnancy, hospice/palliative care, and death. There is no information provided to suggest the member falls into any of these exclusion categories, but even if they were excluded, it would still result in them not being a compliant or non-compliant member for the measure's intent. However, the primary reason for their status is their failure to meet the denominator's "event" criteria.

Regarding the output format, the prompt specified that for measures like QM-CBP (which is not QM-FUM), only "status" and "reason" keys are required. The other keys ('met_7_day', 'met_30_day') are explicitly for QM-FUM and thus irrelevant here.

Therefore, my final conclusion is that the member is "not_eligible." The reason for this status is directly tied to their lack of a qualifying hypertension encounter within the specific timeframe mandated by the measure's denominator.

In summary, my thought process led me to the following:

*   **Status:** "not_eligible"
*   **Reason:** "The member had no outpatient encounter with a hypertension diagnosis (I10) between 2026-01-01 and 2026-06-30."

Alright, I'm tasked with evaluating member 40117 against the QM-CBP quality measure for the 2026 measurement year. My goal is to determine their status – whether they are `compliant`, `non_compliant`, `excluded`, or `not_eligible`, and to provide a clear `reason` for that determination.

First, I need to dissect the QM-CBP specification for the measurement year 2026, which spans from January 1st to December 31st, 2026. Then, I'll meticulously cross-reference this with the member's record.

The core of this measure is about **blood pressure control in hypertension**.

Let's start with the **ELIGIBLE POPULATION**, which defines who should be included in the denominator.

*   **Age:** The member needs to be between 18 and 85 years old as of December 31st, 2026. Member's DOB is November 11th, 1975. Calculating their age for 2026, that's 2026 minus 1975, which is 51 years old. Since 51 falls comfortably within the 18-85 range, this criterion is met.
*   **Event:** This is a crucial one. The member must have had at least one outpatient encounter with a hypertension diagnosis (specifically ICD-10 code I10) between January 1st, 2026, and June 30th, 2026. I'm looking at the member's record and I see two encounters with the I10 diagnosis: one on August 19th, 2026, and another on November 4th, 2026. The problem is, the required date range for this initial event is *before* June 30th, 2026. The member's first recorded I10 encounter is on August 19th, 2026, which is *after* the specified cutoff. According to the measure's rules, an encounter happening after June 30th, 2026, *does not* establish the qualifying event. Therefore, this essential criterion is *not met*.
*   **Continuous Enrolment:** The member needs to be continuously enrolled for the entire measurement year, with at most one gap of up to 45 days. The member's record explicitly states their enrolment was continuous from January 1st, 2026, through December 31st, 2026. This criterion is met.

Now, because the member failed to meet the "Event" criterion for the denominator, the determination is already clear: they are **`not_eligible`**. The measure's logic dictates that if they don't qualify for the denominator in the first place, we don't need to go any further.

Just for thoroughness, I'll quickly check the **REQUIRED EXCLUSIONS**, although they won't change the `not_eligible` status. These are things like End-Stage Renal Disease (ESRD), dialysis, pregnancy, hospice, palliative care, or death during the measurement year.
*   The member has no indication of dialysis or ESRD (N18.6, Z99.2).
*   There's no mention of pregnancy (O00-O9A); in fact, the member is male.
*   No hospice or palliative care is documented.
*   The member was alive at the end of the year.
So, none of the exclusion criteria apply.

Since the member is `not_eligible`, I don't need to evaluate the **NUMERATOR**. This part of the measure looks at whether the member's blood pressure was controlled based on their most recent reading after a qualifying encounter. If they *had* been eligible, I would have found their most recent blood pressure reading. For example, their reading on November 4th, 2026, was 130/80, which *would have* met the <140/90 threshold. But again, this is moot because they never met the denominator criteria.

So, to summarize my thought process:
1.  **Age Check:** The member is 51, which is within the 18-85 range for 2026. Met.
2.  **Qualifying Event Check:** The member needed an outpatient hypertension diagnosis (I10) between Jan 1, 2026, and Jun 30, 2026. Their first I10 diagnosis encounter was on Aug 19, 2026, which is *after* the required cutoff. Not Met.
3.  **Enrolment Check:** The member was continuously enrolled for the full year. Met.
4.  **Exclusions Check:** No exclusions apply.

The critical failure point is the timing of the qualifying hypertension encounter. Because the member's first encounter for hypertension occurred *after* the specified six-month period ending June 30th, 2026, they are definitively `not_eligible` for this measure.

Therefore, my conclusion is:
*   **Status:** `not_eligible`
*   **Reason:** "The member's first outpatient encounter for hypertension occurred after the required period ending 2026-06-30."

Alright, let's break down this member's record against the QM-CBP quality measure. I've gone through the specifications and the member's data step-by-step to determine their status.

First, I need to get a solid grip on what this QM-CBP measure actually requires. It's about blood pressure control in hypertension for the 2026 measurement year, which runs from January 1st to December 31st, 2026.

For the **denominator**, the eligible population includes individuals aged 18-85 by the end of 2026. Crucially, they need to have had at least one outpatient encounter with a diagnosis of I10 (essential hypertension) between January 1st, 2026, and June 30th, 2026. They also need to have been continuously enrolled for the entire year, with a maximum of one gap no longer than 45 days.

Now, for the **numerator**, meaning they're compliant: their most recent outpatient blood pressure reading, taken after that initial qualifying encounter and before the end of 2026, must be less than 140 systolic and less than 90 diastolic. Importantly, I need to remember that readings from Emergency Department or inpatient settings don't count.

Then, there are the **exclusions**. I've got four to watch out for: end-stage renal disease (ESRD) or dialysis, pregnancy, being on hospice or palliative care, or passing away during the measurement year.

Next, I'll shift my focus to **MEMBER 40117's specific record**.
*   Member ID is 40117.
*   Their DOB is November 11th, 1975.
*   They are male.
*   Their enrolment is for the entire year, January 1st to December 31st, 2026, and it's continuous. That's good, that part of the eligibility criterion is met.
*   Looking at their encounters:
    *   There was an office visit on August 19th, 2026, with diagnosis I10, and their BP was recorded as 138/86.
    *   Then, another office visit on November 4th, 2026, also with I10, showing BP as 130/80.
*   Regarding exclusions, there's no mention of hospice, pregnancy, or dialysis, and they were alive at the end of the year. So, no exclusions seem to apply.

Now, the critical part: **evaluating eligibility for the denominator**.
*   **Age:** The member was born on November 11th, 1975. As of December 31st, 2026, they will be 51 years old (2026 - 1975 = 51). This falls perfectly within the 18-85 age range. So, the age criterion is met.
*   **Enrolment:** As noted, their enrolment is continuous for the full year, which satisfies the requirement.
*   **Event:** This is where I need to be precise. The measure specifies "at least one outpatient encounter with a hypertension diagnosis (I10) on or between 2026-01-01 and 2026-06-30." I see two encounters for this member with diagnosis I10: one on August 19th, 2026, and another on November 4th, 2026. **Neither of these dates falls within the required window of January 1st, 2026, to June 30th, 2026.** This means the member does *not* meet the essential event criterion to be included in the denominator for this measure.

Therefore, my **conclusion on their status** is "not_eligible". The specific reason is that their first qualifying hypertension encounter occurred after the required initial window, which closed on June 30th, 2026.

Based on this, I'll formulate the JSON output. The `status` will be "not_eligible", and the `reason` will be: "The member's first hypertension diagnosis encounter was after the required window of 2026-01-01 to 2026-06-30."

This entire thought process seems sound and covers all the necessary checks. I'm confident in this assessment.

Alright, I've gone through member 40117's record to evaluate them against the QM-CBP quality measure. Here's how my thought process unfolded:

My initial plan was to systematically assess eligibility, then any exclusions, and finally, numerator compliance.

First, I focused on **eligibility**. This involves checking age, continuous enrollment, and the specific event criteria.
*   For **age**, the member was born on 1975-11-11. For the 2026 measurement year, their age on December 31, 2026, would be 51 (2026 - 1975). Since the measure's age range is 18 to 85, this criterion is met.
*   Next, **continuous enrollment**. The record clearly states continuous enrollment from 2026-01-01 through 2026-12-31. This fully covers the measurement year and satisfies the requirement for enrollment throughout that period. So, this criterion is also met.
*   The crucial part is the **event criterion**. The rule requires at least one outpatient encounter with a hypertension diagnosis (I10) specifically between 2026-01-01 and 2026-06-30. I found two office visits with an I10 diagnosis, one on 2026-08-19 and another on 2026-11-04. The problem is, both of these dates fall *after* the specified end date of 2026-06-30. This means the member did not have a qualifying event to even enter the denominator for this measure.

Based on this, my conclusion at this point is that the member is "not_eligible."

Even though the member wasn't eligible, I decided to proceed with checking **exclusions** for thoroughness.
*   E1 (ESRD/Dialysis): The record shows no dialysis and no N18.6 code. Not excluded.
*   E2 (Pregnancy): The record states no pregnancy, and the member is male. Not excluded.
*   E3 (Hospice/Palliative): The record indicates no hospice care. Not excluded.
*   E4 (Death): The member was alive at the end of the year. Not excluded.
So, no exclusions applied, which is expected since they weren't eligible anyway.

Then, I looked at the **numerator compliance**. This step is technically moot because the member never qualified for the denominator. However, if they had, the rule would require checking the most recent outpatient BP reading on or after the qualifying encounter. The most recent reading was 130/80 on 2026-11-04, which would have been compliant (systolic < 140, diastolic < 90). But without that anchor qualifying encounter, this check doesn't lead to a compliant status.

Therefore, my **final status** is definitively "not_eligible." The **reason** is that the member did not have a qualifying hypertension encounter on or before 2026-06-30. I've refined this reason to be as precise and concise as possible, focusing on the specific date boundary that caused the ineligibility.

The final output, in JSON, reflects this:
```json
{
  "status": "not_eligible",
  "reason": "The member did not have a qualifying hypertension encounter on or before 2026-06-30."
}
```

We need answer with JSON only. Need evaluate QM-CBP measure.

We have measure QM-CBP. Member 40117 DOB 1975-11-11. Measurement year 2026. Age as of 2026-12-31: birthday Nov 11, 1975 -> in 2026 turns 51 on Nov 11 2026. As of Dec 31 2026, age 51. Eligible 18-85 inclusive. Yes denominator potentially.

Event: at least one outpatient encounter with hypertension diagnosis (I10) on or between 2026-01-01 and 2026-06-30. Encounter after 2026-06-30 does not establish event. Member encounters dates: 2026-08-19 and 2026-11-04. Both after 2026-06-30. No encounter in Jan-Jun with I10? Record only lists those. So no qualifying event? Wait the event requires at least one outpatient encounter with hypertension diagnosis on or between Jan 1 and Jun 30. The encounters are after Jun 30, so they do not establish the event. Even though they have I10 and BP readings, those are after the event window. Therefore member never enters denominator: not_eligible. But we must be careful: Are we to use the BP readings from those encounters as most recent? The numerator says most recent outpatient BP reading taken on or after date of qualifying hypertension encounter and on or before 2026-12-31. If no qualifying encounter exists, there is no denominator. Since continuous enrolment yes, age yes, but event failed. So status "not_eligible". Reason: one sentence under 30 words naming specific criterion or date that decided it. Need say: No outpatient hypertension encounter between 2026-01-01 and 2026-06-30; first listed I10 encounter is 2026-08-19. Count words: "No outpatient hypertension encounter between 2026-01-01 and 2026-06-30; first I10 encounter is 2026-08-19." That's maybe 19 words. Need include date? Criterion is event window Jan 1-Jun 30; encounter 2026-08-19 is after, so doesn't establish event. Should reason be: "No outpatient I10 encounter occurred on or between 2026-01-01 and 2026-06-30; the earliest I10 visit is 2026-08-19." Word count: No(1) outpatient(2) I10(3) encounter(4) occurred(5) on(6) or(7) between(8) 2026-01-01(9) and(10) 2026-06-30(11); the(12) earliest(13) I10(14) visit(15) is(16) 2026-08-19(17). Under 30. Good.

Now, keys: The required JSON keys for this task family: "status", "reason". It says Items drawn from measure QM-FUM require two further keys, but this is QM-CBP, so no met_7_day/met_30_day. Do not add keys not asked for. So JSON object with status and reason only.

Need ensure no other code block, no commentary. Output exactly one fenced JSON code block and nothing else.

Let's double-check if any nuance: Event: "at least one outpatient encounter with a hypertension diagnosis (I10) on or between 2026-01-01 and 2026-06-30. An encounter after 2026-06-30 does not establish the event." The member has office visits on 2026-08-19 and 2026-11-04, both office visits (outpatient) with I10. But they are after June 30, so do not establish event. Could the date of qualifying hypertension encounter be the 2026-08-19 for numerator if event was established by an earlier encounter? But there is no earlier encounter. Since no event, not in denominator. So not_eligible. Yes.

Check if age: DOB 1975-11-11. As of 2026-12-31, age = 51 (since 2026-1975=51, birthday passed Nov 11). Within 18-85. Good.

Continuous enrollment: 2026-01-01 through 2026-12-31 continuous. Fills criteria. But event missing.

Exclusions: none. But exclusions evaluated before numerator only if in denominator; not eligible so no.

Now reason wording under 30 words. Let's craft final:

```json
{
  "status": "not_eligible",
  "reason": "No outpatient I10 encounter occurred on or between 2026-01-01 and 2026-06-30; the earliest I10 visit is 2026-08-19."
}
```

Count words in reason: No(1) outpatient(2) I10(3) encounter(4) occurred(5) on(6) or(7) between(8) 2026-01-01(9) and(10) 2026-06-30(11); the(12) earliest(13) I10(14) visit(15) is(16) 2026-08-19(17). Semicolon separate maybe not word. Under 30. It names criterion (event window) and date (2026-08-19). Good.

Could there be a scenario where the Aug 19 encounter establishes the event because the measure says "at least one outpatient encounter with hypertension diagnosis on or between Jan 1 and Jun 30. An encounter after Jun 30 does not establish the event." Clear. So not eligible.

Need exactly one fenced JSON code block. Ensure backticks with json. No trailing text. Use ISO dates in reason? Yes dates given as ISO. Good.

Let's final.

We need answer JSON only. Need apply QM-CBP measure. Let's parse.

Member 40117. DOB 1975-11-11. Measurement year 2026. Age as of 2026-12-31: DOB 1975-11-11 -> turns 51 in 2026 (2026 - 1975 = 51, birthday Nov 11, 2026, before Dec 31). So age 51, between 18 and 85. Eligible on age.

Event: at least one outpatient encounter with hypertension diagnosis (I10) on or between 2026-01-01 and 2026-06-30. Encounter after 2026-06-30 does not establish event.

Member has encounters:
- 2026-08-19 Office visit, diagnosis I10. BP 138/86. Date is after 2026-06-30 (August 19). Does not establish event per event window. Also BP reading is after qualifying encounter? But no qualifying encounter in first half.
- 2026-11-04 Office visit, diagnosis I10. BP 130/80. Also after 2026-06-30.

No encounter in the required event window (Jan 1 - Jun 30 2026). Therefore member never enters denominator: "not_eligible" due to no qualifying outpatient hypertension encounter between 2026-01-01 and 2026-06-30. Wait: The status "not_eligible" means never enters denominator (age, event, or enrolment). Here event not met. So status = not_eligible. Reason: one sentence under 30 words naming specific criterion or date that decided it. Something like: "No outpatient hypertension encounter with I10 occurred between 2026-01-01 and 2026-06-30, so the event criterion for the denominator is not met." Count words: No(1) outpatient(2) hypertension(3) encounter(4) with(5) I10(6) occurred(7) between(8) 2026-01-01(9) and(10) 2026-06-30(11), so(12) the(13) event(14) criterion(15) for(16) the(17) denominator(18) is(19) not(20) met(21). Good.

Need note exclusions? Status not_eligible. Exclusions evaluated before numerator, but if not in denominator, exclusions irrelevant? Task: "A member who never enters the denominator is 'not_eligible' even if a compliance event is present in the record." Even if exclusion? If not eligible based on event, status not_eligible. There's no QM-FUM keys required (this is QM-CBP, not QM-FUM). Required keys: status, reason. Since not QM-FUM, no met_7_day/met_30_day. Need only those two keys? The task says Required JSON keys: "status", "reason". Items drawn from measure QM-FUM require two further keys. This is QM-CBP, so just status and reason.

But let's double-check if there is any nuance: Event requires outpatient encounter with hypertension diagnosis I10 on or between 2026-01-01 and 2026-06-30. The record has office visits 2026-08-19 and 2026-11-04. Both are after 2026-06-30, therefore they do not establish event. The measure says "An encounter after 2026-06-30 does not establish the event." So denominator event not met. Continuous enrolment: enrolled full year 2026-01-01 through 2026-12-31, continuous. Age ok. So not eligible due to event not met.

What about numerator? The most recent outpatient BP reading taken on or after the date of the qualifying hypertension encounter and on or before 2026-12-31 is below 140/90. Since there is no qualifying hypertension encounter, we don't evaluate numerator. Status not_eligible. Member has BP readings 130/80 and 138/86, both below thresholds, but not relevant because no qualifying encounter. Not compliant.

Need ensure reason under 30 words, one sentence. Maybe: "No I10 outpatient encounter occurred between 2026-01-01 and 2026-06-30, so the denominator event criterion is not met." Count: No1 I10? "I10" maybe 2? Let's count carefully: No(1) I10(2) outpatient(3) encounter(4) occurred(5) between(6) 2026-01-01(7) and(8) 2026-06-30,(9) so(10) the(11) denominator(12) event(13) criterion(14) is(15) not(16) met.(17) Good.

Alternative: "The only I10 office visits were after 2026-06-30, so no qualifying hypertension encounter established denominator eligibility." Count: The1 only2 I10? 3 office4 visits5 were6 after7 2026-06-30,8 so9 no10 qualifying11 hypertension12 encounter13 established14 denominator15 eligibility16. Good, under 30. This names date. Maybe more precise: "The only I10 office visits occurred on 2026-08-19 and 2026-11-04, after the 2026-06-30 event deadline, so the member is not eligible." Count: The1 only2 I10? 3 office4 visits5 occurred6 on7 2026-08-19? (date maybe one token) and8 2026-11-04,9 after10 the11 2026-06-30? 12 event13 deadline,14 so15 the16 member17 is18 not19 eligible.20. Good.

Need include status string exactly "not_eligible". Reason one sentence. Let's craft final JSON:

{
  "status": "not_eligible",
  "reason": "The only I10 office visits occurred on 2026-08-19 and 2026-11-04, after the 2026-06-30 event deadline, so the member is not eligible."
}

Check reason under 30 words: The(1) only(2) I10(3) office(4) visits(5) occurred(6) on(7) 2026-08-19(8) and(9) 2026-11-04,(10) after(11) the(12) 2026-06-30(13) event(14) deadline,(15) so(16) the(17) member(18) is(19) not(20) eligible.(21) Good.

Need output exactly one fenced JSON code block and nothing else. Ensure no extra text. Use code block with json. No preamble.

Let's double-check age: DOB 1975-11-11. As of 2026-12-31, age = 51. Within 18-85. Enrollment continuous. Exclusions: none (no ESRD/dialysis, no pregnancy, no hospice, alive). But since not eligible due to event, exclusions not needed. If someone argued denominator requires event, event not met, so not_eligible. Good.

The task says exclusions are evaluated before numerator. But "A member who never enters the denominator is 'not_eligible' even if a compliance event is present in the record." Here compliance event (BP control) might be present? Most recent outpatient BP reading on or after date of qualifying hypertension encounter... there is no qualifying encounter. If there were a qualifying encounter? Wait, numerator definition: most recent outpatient BP reading taken on or after the date of the qualifying hypertension encounter and on or before 2026-12-31. The qualifying hypertension encounter is the one that establishes denominator event. Since no encounter in event window, no qualifying encounter. Then no qualifying reading? Actually if no qualifying encounter, we can't have reading after it. The numerator cannot be met because denominator not entered. Status not_eligible.

Check if there is any possibility that the event window is not about the encounter establishing denominator, but could an encounter after Jun 30 count as "qualifying hypertension encounter" for numerator? No: Event definition: at least one outpatient encounter with I10 on or between Jan 1 and Jun 30. So the denominator event must be in first half. Any encounter after Jun 30 does not establish event. It could still be a "qualifying hypertension encounter" for numerator? The numerator says "on or after the date of the qualifying hypertension encounter". The phrase "qualifying hypertension encounter" refers to the encounter that qualified the member for the denominator (the event). Since none, no numerator evaluation. But suppose someone interpreted the 2026-08-19 encounter as the "qualifying hypertension encounter"? The measure explicitly says "An encounter after 2026-06-30 does not establish the event." So it's not qualifying for denominator. So not eligible.

Need final answer only JSON code block.

One more nuance: The reason must name the specific criterion or date that decided it. Our reason names dates (2026-08-19 and 2026-11-04, after 2026-06-30 event deadline). That's specific. Good.

Let's also ensure we don't include keys not asked for. Only status and reason. No met_7_day etc.

Final: 
```json
{
  "status": "not_eligible",
  "reason": "The only I10 office visits occurred on 2026-08-19 and 2026-11-04, after the 2026-06-30 event deadline, so the member is not eligible."
}
```

We need answer JSON with status, reason, and for QM-CBP no met_7_day/met_30_day (only QM-FUM). Need apply measure spec. Member record: DOB 1975-11-11, age as of 2026-12-31? 2026 minus 1975 = 51 (birthday Nov 11, 2026, so 51 as of Dec 31 2026). Eligible age 18-85 yes. Event: at least one outpatient encounter with hypertension diagnosis I10 on or between 2026-01-01 and 2026-06-30. Record shows encounters: 2026-08-19 and 2026-11-04, both after 2026-06-30. No encounter during Jan 1 - Jun 30. Therefore event not established. Continuous enrolment yes. But event fails. Therefore member never enters denominator: "not_eligible". Wait check: eligible population requires event on or between Jan 1 and Jun 30. The qualifying hypertension encounter must be within first half of year. Encounters after Jun 30 do not establish event. So member not in denominator. Therefore status = not_eligible. Reason: one sentence under 30 words naming specific criterion or date that decided it. Need say no outpatient encounter with I10 between 2026-01-01 and 2026-06-30 (the qualifying encounter is 2026-08-19 and 2026-11-04, after deadline). Need be precise. Example: "No qualifying hypertension encounter occurred on or between 2026-01-01 and 2026-06-30; both I10 office visits were after 2026-06-30." Count words? Let's count: No(1) qualifying(2) hypertension(3) encounter(4) occurred(5) on(6) or(7) between(8) 2026-01-01(9) and(10) 2026-06-30;(11) both(12) I10(13) office(14) visits(15) were(16) after(17) 2026-06-30.(18) Under 30. Good.

But wait: Need evaluate exclusions before numerator? The task says Exclusions are evaluated before numerator. Member who never enters denominator is not_eligible even if compliance event present. Here no event in denominator window, so not_eligible.

Potential nuance: The measure denominator requires "at least one outpatient encounter with a hypertension diagnosis (I10) on or between 2026-01-01 and 2026-06-30." Encounters are office visits outpatient. Diagnosis I10. They are on 2026-08-19 and 2026-11-04. Both are after Jun 30. So not eligible. No need to consider numerator BP readings. But wait: Numerator says "most recent outpatient blood pressure reading taken on or after the date of the qualifying hypertension encounter and on or before 2026-12-31". Since there is no qualifying encounter, no numerator. But status not_eligible.

Check QM-FUM keys: only if drawn from QM-FUM. This is QM-CBP. So no met_7_day/met_30_day keys. Must not add keys. Required keys status and reason. Exactly.

Need output exactly one fenced JSON code block and nothing else. JSON object with "status" and "reason". Ensure dollar amounts not relevant. Dates ISO. Reason string no trailing? Should be JSON string.

Let's ensure no other required keys? Task says Required JSON keys: status, reason. Items drawn from QM-FUM require two further keys. This is not QM-FUM. So only those two.

But let's double-check age: DOB 1975-11-11. On 2026-12-31, age = 51 (2026-1975=51, birthday passed). Within 18-85 yes. Continuous enrolment: enrolled full measurement year 2026-01-01 through 2026-12-31, continuous. It says continuous. Good.

Exclusions: none (no ESRD/dialysis, no pregnancy, no hospice/palliative, alive). But exclusions only remove from denominator; if not in denominator, not_eligible regardless. Actually if no event, not_eligible.

Let's verify if there's any chance the event could be established by the 2026-08-19 encounter if considered "qualifying hypertension encounter"? The spec explicitly: "Event: at least one outpatient encounter with a hypertension diagnosis (I10) on or between 2026-01-01 and 2026-06-30. An encounter after 2026-06-30 does not establish the event." So no.

Now reason under 30 words. Let's draft:

"Member had no outpatient encounter with diagnosis I10 on or between 2026-01-01 and 2026-06-30; both I10 visits were after 2026-06-30."

Word count: Member(1) had(2) no(3) outpatient(4) encounter(5) with(6) diagnosis(7) I10(8) on(9) or(10) between(11) 2026-01-01(12) and(13) 2026-06-30;(14) both(15) I10(16) visits(17) were(18) after(19) 2026-06-30.(20) Under 30. Good. It names criterion and date.

Could also mention "event not established". Let's count: "No qualifying hypertension encounter occurred between 2026-01-01 and 2026-06-30; the I10 office visits were on 2026-08-19 and 2026-11-04, after the deadline." Count: No1 qualifying2 hypertension3 encounter4 occurred5 between6 2026-01-01 7 and8 2026-06-30;9 the10 I10 11 office12 visits13 were14 on15 2026-08-19 16 and17 2026-11-04,18 after19 the20 deadline.21 Under 30. That's fine and names specific dates. Maybe better because it includes dates of visits. Both okay.

Need JSON string escaping: use regular hyphens and commas. No newline inside string? Fine. Use double quotes. Ensure no trailing comma. Output:

```json
{
  "status": "not_eligible",
  "reason": "No qualifying hypertension encounter occurred between 2026-01-01 and 2026-06-30; the I10 office visits were on 2026-08-19 and 2026-11-04, after the deadline."
}
```

Check word count of reason: Let's recount carefully:
1 No
2 qualifying
3 hypertension
4 encounter
5 occurred
6 between
7 2026-01-01
8 and
9 2026-06-30;
10 the
11 I10
12 office
13 visits
14 were
15 on
16 2026-08-19
17 and
18 2026-11-04,
19 after
20 the
21 deadline.
21 words. Good.

Should we include period at end? It's part of string, fine. Under 30 words.

Check if "not_eligible" vs "excluded"? Not eligible because no event in denominator window. Yes.

Need output only fenced JSON code block. No preamble. Ensure code block uses ```json and then object and closing ```. No other text.

Let's double-check if any hidden nuance: The encounter on 2026-08-19 has BP 138/86; 2026-11-04 BP 130/80. If event had been somehow before Jun 30? No. Since no event, not eligible. Suppose someone misreads: The qualifying hypertension encounter could be the most recent before BP? But spec says event window fixed. An encounter after Jun 30 does not establish event. So no.

Potential nuance: continuous enrolment: "enrolled for the full measurement year with no more than one gap of up to 45 days." Record says 2026-01-01 through 2026-12-31, continuous. Good.

Exclusions evaluated before numerator, but since not eligible, we don't evaluate exclusions? Actually if never enters denominator, not_eligible even if exclusions? Here no exclusions anyway.

One more nuance: "numerator: most recent outpatient blood pressure reading taken on or after the date of the qualifying hypertension encounter and on or before 2026-12-31 is below 140 systolic AND below 90 diastolic." If there had been qualifying encounter before Jun 30? None. The 2026-08-19 BP reading is 138/86 (both below thresholds) and 2026-11-04 130/80 (both below thresholds). If the event had been considered 2026-08-19 (erroneously), then most recent reading on/after that date is 130/80 on 2026-11-04, which is below 140/90, so numerator met, compliant. But event window fails. So not_eligible.

Could there be an interpretation that the event is any outpatient encounter with I10 during measurement year, and the Jun 30 cutoff is for "qualifying encounter" for numerator? Wait read spec exactly:

ELIGIBLE POPULATION (denominator)
  Age...
  Event: at least one outpatient encounter with a hypertension diagnosis (I10) on or between 2026-01-01 and 2026-06-30. An encounter after 2026-06-30 does not establish the event.
  Continuous enrolment...

So event is fixed.

Thus final answer straightforward.

Need ensure status string exactly "not_eligible". Yes.

Let's prepare final.

The user wants me to evaluate a member against the QM-CBP measure.
 Let me break down the measure and the member record.

 MEASURE QM-CBP — BLOOD PRESSURE CONTROL IN HYPERTENSION
 Measurement year: 2026-01-01 through 2026-12-31.

 DENOMINATOR criteria:
 1. Age: 18 through 85 years as of 2026-12-31.
    Member DOB: 1975-11-11.
    As of 2026-12-31, age = 2026 - 1975 = 51 years old. (Born Nov 11, so on Dec 31 they are 51). 18 ≤ 51 ≤ 85. PASS.

 2. Event: at least one outpatient encounter with hypertension diagnosis (I10) on or between 2026-01-01 and 2026-06-30.
    Member encounters:
    - 2026-08-19 Office visit, diagnosis I10. BP 138/86.
    - 2026-11-04 Office visit, diagnosis I10. BP 130/80.
    Neither encounter is between 2026-01-01 and 2026-06-30.
    The event criterion is NOT MET.

 3. Continuous enrolment: enrolled for the full measurement year with no more than one gap of up to 45 days.
    Enrolment: 2026-01-01 through 2026-12-31, continuous. PASS.

 Since the event criterion is not met (no outpatient encounter with I10 between Jan 1 and June 30), the member is not in the denominator.

 Exclusions: Not relevant because not in denominator, but let's check anyway.
 E1. End stage renal disease: No.
 E2. Pregnancy: Male, so no.
 E3. Hospice: No.
 E4. Died: No, alive at year end.

 Since the member never enters the denominator due to failing the event criterion (encounter must be on or between 2026-01-01 and 2026-06-30), the status is "not_eligible".

 The reason should be one sentence, under 30 words, naming the specific criterion or date that decided it.
 "No qualifying hypertension encounter between 2026-01-01 and 2026-06-30." (8 words) - good.
 Or "Qualifying hypertension encounter did not occur by 2026-06-30." (8 words) - good.

 Wait, the prompt 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 would be the BP readings, but the denominator event (qualifying encounter) is missing.

 So status: "not_eligible"
 reason: "No outpatient hypertension encounter occurred between 2026-01-01 and 2026-06-30."

 Let me check word count: "No outpatient hypertension encounter occurred between 2026-01-01 and 2026-06-30." (10 words) - under 30.

 Wait, the task mentions: "Items drawn from measure QM-FUM require two further keys: "met_7_day" boolean, "met_30_day" boolean". But this is measure QM-CBP, not QM-FUM. So these keys are NOT required.

 Required JSON keys:
 "status": string
 "reason": string

 That's it. No extra keys.

 Let me double-check the date logic.
 Member DOB: 1975-11-11.
 On 2026-12-31: Age is 2026 - 1975 = 51, but has the birthday passed? Yes, birthday is Nov 11, so on Dec 31 they are 51. Age 51 is between 18 and 85.

 Event: "at least one outpatient encounter with a hypertension diagnosis (I10) on or between 2026-01-01 and 2026-06-30."
 Encounters are on 2026-08-19 and 2026-11-04. Both are after 2026-06-30. So no qualifying event.

 Therefore, not eligible.

 Is there any trick? "An encounter after 2026-06-30 does not establish the event." - explicitly stated. So my logic holds.

 Final answer:
 status: "not_eligible"
 reason: "No outpatient hypertension encounter occurred between 2026-01-01 and 2026-06-30."

 Or perhaps more concisely: "Qualifying hypertension encounter did not occur by 2026-06-30." (8 words)

 I should make sure the reason is precise. The criterion is "at least one outpatient encounter with a hypertension diagnosis (I10) on or between 2026-01-01 and 2026-06-30."

 "No qualifying I10 encounter between 2026-01-01 and 2026-06-30." (9 words). Good.

 Let me verify if "not_eligible" is the correct term for missing denominator criteria. Yes: "not_eligible: never enters the denominator (age, event, or enrolment)". Here it's event.

 The JSON should be exactly:
 ```json
 {
   "status": "not_eligible",
   "reason": "No qualifying I10 encounter between 2026-01-01 and 2026-06-30."
 }
 ```

 Wait, is the office visit considered an outpatient encounter? Typically yes, office visit is outpatient. But the date is what disqualifies it.

 Final check on format: exactly one fenced JSON code block and nothing else. No preamble.

 ```json
 {
   "status": "not_eligible",
   "reason": "No qualifying I10 encounter between 2026-01-01 and 2026-06-30."
 }
 ```

 This seems correct.

 The user wants me to evaluate member 40117 against the QM-CBP measure specification.

 First, let's check denominator eligibility:
 1. Age: DOB 1975-11-11. As of 2026-12-31, member is 51 years old (2026-1975 = 51, birthday in November so by Dec 31 they have turned 51). 18-85 range: yes, eligible.
 2. Event: At least one outpatient encounter with hypertension diagnosis I10 on or between 2026-01-01 and 2026-06-30.
    - Check encounters:
      - 2026-08-19 Office visit, diagnosis I10. BP 138/86. This is AFTER 2026-06-30, so it does not establish the event.
      - 2026-11-04 Office visit, diagnosis I10. BP 130/80. This is AFTER 2026-06-30, so it does not establish the event.
    - No qualifying encounter on or before 2026-06-30.
    - Since there is no qualifying event in the required timeframe, the member never enters the denominator.

 Wait, let me re-read the event criteria carefully: "Event: at least one outpatient encounter with a hypertension diagnosis (I10) on or between 2026-01-01 and 2026-06-30. An encounter after 2026-06-30 does not establish the event."

 The member has encounters on 2026-08-19 and 2026-11-04, both after 2026-06-30. Therefore, the member does NOT meet the event criterion.

 Since the member never enters the denominator due to lack of qualifying event, status is "not_eligible".

 Wait, but the prompt says: "A member who never enters the denominator is 'not_eligible' even if a compliance event is present in the record." Here, there's no compliance event (numerator event), but more importantly, there's no qualifying denominator event.

 The member is not eligible because there is no qualifying hypertension encounter on or between 2026-01-01 and 2026-06-30.

 Let me double check if the later encounters could somehow qualify for numerator but not denominator. The numerator requires: "The most recent outpatient blood pressure reading taken on or after the date of the qualifying hypertension encounter and on or before 2026-12-31..." Since there is no qualifying hypertension encounter (which must be on or before 2026-06-30), there is no date from which to measure. But actually, since the member never enters the denominator, we don't even get to the numerator.

 Actually wait - the prompt says "Date of birth 1975-11-11. Male." Age calculation: 2026 - 1975 = 51. Born November 11, so by Dec 31, 2026, they are 51. That's within 18-85.

 Continuous enrollment: 2026-01-01 through 2026-12-31, continuous - meets that.

 But event is missing. So "not_eligible".

 Let me make sure: the event requires the encounter to be on or between Jan 1 and June 30, 2026. The member has I10 encounters in August and November. Those don't establish the event. So indeed, not eligible.

 Wait, could the prompt mean something else by "not_eligible"? The definition says: "not_eligible — never enters the denominator (age, event, or enrolment)". Yes.

 So status: "not_eligible"
 reason: something like "No qualifying hypertension encounter between 2026-01-01 and 2026-06-30." or "Hypertension encounters occurred after 2026-06-30." Let me keep it under 30 words.

 "No outpatient hypertension encounter on or between 2026-01-01 and 2026-06-30." That's 9 words. Good.

 Wait, the instructions say "Items drawn from measure QM-FUM require two further keys...". This is QM-CBP, not QM-FUM, so we don't need met_7_day or met_30_day.

 Keys required:
 - status: "not_eligible"
 - reason: string one sentence under 30 words.

 Let me verify exclusions: None apply (no ESRD, not pregnant, no hospice, alive). But we don't get to exclusions because not in denominator.

 Let me reconsider: Is there any ambiguity? The encounters are office visits (outpatient) with I10. But they're after June 30. The spec says "An encounter after 2026-06-30 does not establish the event." Clear.

 Therefore final answer:
 ```json
 {
   "status": "not_eligible",
   "reason": "No qualifying hypertension encounter between 2026-01-01 and 2026-06-30."
 }
 ```

 Wait, I should double check the exact wording for the reason. It says "one sentence, under 30 words, naming the specific criterion or date that decided it".

 "No qualifying hypertension encounter occurred between 2026-01-01 and 2026-06-30." (11 words)
 Or: "Hypertension encounters occurred after 2026-06-30; none in the required period." (10 words)

 But the key is clear. I'll go with: "No outpatient hypertension encounter on or between 2026-01-01 and 2026-06-30."

 Actually, the problem says "An encounter after 2026-06-30 does not establish the event." The specific criterion that failed is the event criterion. The date is the fact that both encounters were after 2026-06-30.

 Let me make sure JSON is exactly one fenced code block and nothing else.

 Yes.

 One more check: Is an office visit considered an outpatient encounter? Typically yes. The spec says "outpatient encounter with a hypertension diagnosis". The record says "Office visit". Office visits are outpatient. But since the dates are wrong, it doesn't matter.

 Final answer confirmed.

Let me work through this step by step according to the QM-CBP measure specification.

**MEMBER 40117 - QM-CBP BLOOD PRESSURE CONTROL IN HYPERTENSION**

Measurement year: 2026-01-01 through 2026-12-31

**STEP 1: Check if member is eligible for the denominator**

Age requirement:
- DOB: 1975-11-11
- Age as of 2026-12-31: 2026 - 1975 = 51 years old (will turn 51 on 2026-11-11)
- Within range 18-85? YES ✓

Event requirement (at least one outpatient encounter with hypertension diagnosis I10 between 2026-01-01 and 2026-06-30):
- 2026-08-19: Office visit with I10 diagnosis BUT this is AFTER 2026-06-30, so it does NOT count
- 2026-11-04: Office visit with I10 diagnosis BUT this is AFTER 2026-06-30, so it does NOT count
- NO qualifying encounter in the required timeframe (on or between 2026-01-01 and 2026-06-30)
- Event requirement NOT met ✗

Continuous enrolment:
- 2026-01-01 through 2026-12-31, continuous
- No gaps mentioned
- Continuous enrolment requirement MET ✓

**STEP 2: Determine eligibility for denominator**

For a member to be in the denominator, ALL three requirements must be met:
1. Age ✓
2. Event ✗
3. Continuous enrolment ✓

Since the event requirement is NOT met, the member does NOT enter the denominator.

Status: "not_eligible" because the member never enters the denominator (the qualifying event requirement was not met).
**STEP 3: Reason**

Neither of the member's encounters falls within the qualifying window — both the 2026-08-19 and 2026-11-04 visits with I10 occur after 2026-06-30, so the event requirement isn't satisfied and the member never enters the denominator.

Status: "not_eligible"
Reason: "No qualifying hypertension encounter on or before 2026-06-30."

Concise and specific, under the word limit.

Let me work through this systematically according to the QM-CBP specification.

**Step 1: Check eligibility (denominator criteria)**

1. **Age**: DOB 1975-11-11. Age as of 2026-12-31: 2026 - 1975 = 51 years old. Within 18-85 range. ✓

2. **Event**: Need at least one outpatient encounter with hypertension diagnosis (I10) on or between 2026-01-01 and 2026-06-30.
   - 2026-08-19: Office visit, I10 diagnosis. This is AFTER 2026-06-30, so it does NOT establish the event.
   - 2026-11-04: Office visit, I10 diagnosis. This is also after 2026-06-30.
   - The member has no qualifying hypertension encounter in the required date range (on or before 2026-06-30).
   - Therefore, the member does NOT meet the denominator criteria for the event requirement. ✗

3. **Continuous enrolment**: Enrolled 2026-01-01 through 2026-12-31, continuous. No gaps mentioned. ✓

**Step 2: Denominator decision**

The member fails the event criterion. They never enter the denominator because they don't have a qualifying hypertension encounter during the required window (on or before 2026-06-30).

Status: "not_eligible"

**Step 3: Reason**

The member must have at least one hypertension encounter on or before 2026-06-30 to be eligible. Both encounters (2026-08-19 and 2026-11-04) occur after this date, so the member never enters the denominator.

Let me verify the dates again:
- Measurement year: 2026-01-01 through 2026-12-31
- Event window: on or between 2026-01-01 and 2026-06-30
- First encounter with I10: 2026-08-19, falls outside this window
- Second encounter with I10: 2026-11-04, also outside this window

Neither encounter qualifies, so the member never enters the denominator — status is "not_eligible."

Reason: "No hypertension diagnosis encounter on or before 2026-06-30."

I should double check the spec wording on the event requirement timeframe before finalizing.

-30; both diagnoses fall after that cutoff." That's concise and captures it well.

Final answer: not_eligible, with reason noting both hypertension encounters (2026-08-19, 2026-11-04) postdate the required 2026-06-30 cutoff.