The HEDIS gap closure workflow that holds up in a busy practice has five steps: plan the visit before the patient arrives, prompt the clinician at the point of care, call patients who are not scheduled, document and code the result so the payer can see it, and send supplemental data for anything claims will miss. The work is not finding gaps, since payers send lists. It is getting each closed gap into the payer's data before the measurement year's deadlines. A practice that runs these steps every week, with an owner for each, closes more gaps than one that runs a chart-chase push in December.
What is HEDIS, and what is a care gap?
The Healthcare Effectiveness Data and Information Set (HEDIS) is a set of performance measures maintained by the National Committee for Quality Assurance (NCQA). NCQA says it includes more than 90 measures across 6 domains of care, and that more than 235 million people are enrolled in plans that report HEDIS results. Health plans report HEDIS, but many measures, such as cancer screenings, blood pressure control and diabetes care, depend on what happens in the practice.
A care gap is a patient who is in a measure's denominator but has no record of the service that satisfies it. In one payer's words, a gap closes only when the member receives the required service or has evidence of a contraindication that the NCQA specification recognizes, so practices should send both, according to Carolina Complete Health's closing care gaps guide. Many "open" gaps are care that happened but never reached the payer.
Medicare Advantage raises the stakes. The Centers for Medicare & Medicaid Services (CMS) uses HEDIS as the data source for Part C Star Ratings measures such as breast cancer screening, colorectal cancer screening, controlling blood pressure and glycemic status, per the CMS 2027 Star Ratings technical notes.
Where do gap lists come from?
Practices usually work from two kinds of list, and they rarely match.
| Payer gap list | Practice's own list | |
|---|---|---|
| Built from | Claims, pharmacy, labs and supplemental data the plan has received | The EHR: visits, results, problem lists, documents |
| Strength | It is what the plan will actually score | Current, and covers every patient regardless of plan |
| Weakness | Lags behind care, and misses care that never reached a claim | Can count care the payer cannot see yet |
| Who it covers | That plan's attributed members only | All patients |
The difference between the two lists is the work. A patient open on the payer list but closed in your EHR needs a submission, not a visit. A patient open on both needs outreach. A patient closed on the payer list but open in your EHR may point to an outside result to file in the chart. A practice with several payers needs one combined list, with the payer next to each patient, so staff do not work five portals.
The five-step workflow
- Pre-visit planning. A day or two before each visit, a medical assistant or care coordinator checks scheduled patients against the combined gap list and notes which gaps can close at that visit: a blood pressure recheck, an A1c draw, a screening order or referral. Orders that can be pended are pended.
- Point-of-care prompts. The clinician sees the open gaps during the visit, in the chart and in the huddle sheet. The aim is that no patient with an open gap leaves without the service, an order, or a documented reason it does not apply.
- Outreach lists. Patients with open gaps and no upcoming visit go on a call list, sorted by what can close fastest and which payer deadline is nearest. Track attempts and outcomes in one place so the next caller can see them.
- Documentation and coding. Record results in the structured fields measures read, not in free text or a scanned document. Add CPT Category II codes where they apply. The American Medical Association (AMA) describes these as optional codes for performance measurement, and one plan notes they reduce how many records it requests for HEDIS chart review and are updated each year to follow NCQA specifications, per BCBSTX. They go alongside, never instead of, the visit's regular CPT codes.
- Supplemental data submission. For care that claims will not show, such as an outside colonoscopy report, an exclusion or a result recorded after the visit, send supplemental data. Carolina Complete Health describes a standard supplemental file as a one-time setup that can then be sent monthly, and treats medical records as nonstandard data that must pass a yearly audit, which delays their effect on rates.
Each step needs a named owner and a weekly time slot. Without that, steps 3 and 5 slip until year-end.
What does the measurement year timing look like?
Payer guidance treats the measurement year as the calendar year. One plan, for example, lists the end of the 2025 measurement period as December 31, 2025, per Blue Cross NC. The deadlines that matter to a practice come after that date and differ by payer:
- Payer supplemental data cutoffs. For measurement year 2025, the same Blue Cross NC guide set nonstandard production files due February 6, 2026, standard files due February 27, 2026, and an early submission date of November 30, 2025 to reduce chart requests.
- NCQA audit cutoffs. NCQA's measurement year 2026 audit timeline has plans stop all nonstandard supplemental data collection in late February 2027, with no exceptions.
- Final results. Plans submit finalized measurement year 2026 results to NCQA by June 15, 2027, per the NCQA data submission timeline.
Claims take time to land too. Carolina Complete Health says closures from claims and standard files show up in 30 to 45 days or less. A gap closed in late December may not reach the payer in time, which is why the work belongs in spring and summer.
How do you know the workflow is working?
Year-end rates arrive too late to steer by. We track a few leading measures monthly, by payer and by site:
- Gaps closed per month, split by how they closed: visit, outreach, or supplemental data.
- Visit capture rate: of patients seen with an open, closable gap, the share who left with it closed or ordered.
- Outreach yield: calls made, visits scheduled, and gaps closed from those visits.
- Payer lag: days from the service to the gap showing closed on the payer list. Rising lag points to a coding or file problem.
- List agreement: patients closed in your EHR but open on the payer list. This should shrink each month as submissions land.
Put two or three of these on the leadership practice KPI scorecard so quality sits next to access and revenue. The same routine serves Medicare reporting, as we cover in how MIPS quality reporting works for athenahealth practices.
How we approach this
Ben Miller built a v1 ambulatory quality measure engine and its Tableau reporting layer, then scaled it with engineering, operations and clinical teams to HEDIS, MIPS and clinician-level reporting for 2M+ primary care patients across about 2,600 sites of care in 19 states. For independent practices, we build the measure logic on your athenaOne data through our analytics and BI architecture service, reconcile it with payer lists, and set up prioritized daily lists for staff. Where it helps, an AI-assisted analyst can sort and draft the outreach work, as described in our AI operations analyst article and our AI operations transformation service.
Where to start
This week, download the current gap list from your largest payer, pick one measure, and compare 25 open patients against their charts. Count how many already had the service. That number tells you whether your first fix is outreach or getting data to the payer. If you want help building the full workflow, book a free strategic assessment.