Your Stars Problem Isn't Member Engagement. It's Documentation.
Most Medicare Advantage plans address the wrong end of the quality pipeline — and pay for it at the cut point.
- The Stars gap most plans aren't addressing isn't member engagement — it's documentation. CMS calculates HEDIS Stars measures from administrative claims, not clinical notes.
- Five systematic documentation failures account for most "missed" Stars events: CPT II codes not added at the point of care, insufficient ICD-10 specificity, incomplete AWVs, lab results disconnected from encounter submission, and adherence gaps that surface only after data lock.
- The financial stakes are concrete: a mid-size plan with 100,000 members can see $40 million in annual revenue swing on a 0.5-star difference. Quality bonus payments to MA plans exceeded $12.7 billion in 2025.
- The same documentation behaviors drive both Stars gaps and risk adjustment undercapture. Plans that run quality and risk adjustment as separate programs pay twice to fix the same root cause.
- Three diagnostic questions separate the four-star plans from the rest — most plans can't answer any of them.
Every Medicare Advantage plan knows the end-of-year Stars scramble. Member outreach campaigns surge in the fall. Call centers work through lists of open care gaps. Nurse case managers chase physicians to close colonoscopy orders and HbA1c labs. And then the data locks, and the results come back — and the plan is still one-tenth of a star short of the cut point that would have unlocked the quality bonus.
The financial stakes are not theoretical. Quality bonus payments to Medicare Advantage plans totaled more than $12.7 billion in 2025, and plans that cross the four-star threshold receive a 5 percent quality bonus adjustment that translates directly into premium dollars, richer benefits, and enrollment growth.1 For a mid-size plan with 100,000 members, the difference between 3.5 and 4.0 stars can represent $40 million or more in annual revenue. Humana's drop from 4.5 to 3.5 stars for its largest contract — affecting 1.6 million members — prompted an 8-K filing and subsequent lawsuit against CMS.2
I have spent years working inside this problem with MA plans, ACOs, and provider groups. What I can tell you is that the outreach-first model is not failing because of execution. Most plans execute it reasonably well. It is failing because it is solving the wrong problem.
The Stars gap most plans are not addressing is not a member engagement gap. It is a documentation gap. And it is hiding in the data layer that sits between the physician's exam room and CMS's quality measurement system.
Care has been provided. The patient has been evaluated. The HbA1c test was performed. The outcome was recorded. The Stars measure still shows a gap — because the clinical event was never captured in a way CMS could see.
The Pipeline Nobody Talks About
CMS calculates Star Ratings for HEDIS measures primarily using administrative claims data — the same encounter records that flow through a plan's Encounter Data Processing System (EDPS) and appear on medical and pharmacy claims.3 This means the path from a physician visit to a Stars numerator event runs through billing, coding, and submission — not through the clinical note alone.
CPT Category II supplemental codes are the specific mechanism designed to capture clinical activity within that administrative pathway.4 When a provider adds code 3044F to an encounter record, it signals to the HEDIS administrative pull that the patient's HbA1c was at goal. Without it, the administrative system has no way to credit the visit — regardless of what the clinical note says.
What breaks in that pipeline is predictable and well-documented, but most plans treat it as a back-office operations problem rather than a quality strategy problem. That frame is expensive. The five most common failures are not technical glitches. They are systematic documentation behaviors that play out at the provider level, in every practice, every week.
| # | The Gap | What Gets Missed | Stars Measure Impact |
|---|---|---|---|
| 1 | CPT II codes not added at point of care | Services performed but not captured in HEDIS administrative pull; care gaps remain open despite clinical completion | Direct Stars numerator misses across CDC, CBP, SPC, COL-E measures; plan loses credit for care already delivered |
| 2 | ICD-10 codes documented at insufficient specificity | Diagnosis codes present but too generic (e.g., E11.9 vs E11.65); administrative data cannot confirm measure eligibility or exclusion | Members incorrectly included or excluded from measure denominators; HEDIS rates distorted |
| 3 | Annual Wellness Visit components incomplete | AWV billed (G0438/G0439) but clinical documentation missing functional status, ACP, pain, or med rec components | COA Stars domain miss; AWV does not satisfy HEDIS Care for Older Adults measure requirements |
| 4 | Lab results not linked to encounter submission | HbA1c, eGFR, LDL performed and documented in EHR, but lab claim rejected or missing from EDPS | CDC (HbA1c control, LDL) and KED measures not credited; plan loses Stars numerator for tests already run |
| 5 | Medication adherence gaps not surfaced until data lock | PDC calculations running below 80% threshold but not identified until CMS data lock — no intervention window | MAD, SAA, SUPD Part D Stars measures — among the highest-weighted in the Star Ratings formula — fall below cut point |
Look at gap number one carefully. A physician sees a diabetic patient, reviews the most recent HbA1c result, documents it in the note, and sends the patient home. That visit is a clinical care gap. But if the encounter record submitted to EDPS does not include CPT II code 3044F alongside the E&M visit code, CMS has no administrative signal that the quality event occurred. The gap remains open. The numerator has been omitted. The Stars measure does not move.
Gap five deserves equal attention. The medication adherence measures — Statin Adherence (SAA), Medication Adherence for Diabetes (MAD), and Statin Use in Persons with Cardiovascular Disease (SPC-E) — carry some of the highest weights in the Star Ratings formula.5 A plan that is not running monthly proportion of days covered (PDC) tracking at the member and provider level will not discover it has a problem until the measurement year has closed and intervention is impossible.
Why Plans Keep Missing It
The reason this gap persists is structural. Most Medicare Advantage plans design their quality improvement programs to focus on member interactions — finding out who hasn't had a colonoscopy, who needs to fill a statin prescription, or who missed their Annual Wellness Visit. Those programs are visible, measurable, and feel like action.
Documentation infrastructure is invisible. It lives in the billing module, the EHR configuration, and the encounter submission workflow. It requires working with providers on coding behavior, not with members on appointment scheduling. And it requires data integration across the EHR, the EDPS submission pipeline, and the claims system — three separate environments that rarely talk to each other in real time.
Because of this, most plans become aware of documentation gaps only after the fact — often during HEDIS chart reviews or when they discover that supplemental data submissions are incomplete. By then, the measurement year is usually already closed or almost finished. The intervention window is gone.
The average MA plan runs its Stars quality program and its risk adjustment program as two separate functions, often with two separate vendors. But the root cause of both problems — underdocumented clinical activity and insufficient diagnosis specificity — is identical. Treating them separately doubles the cost and halves the impact.
The Upstream Fix
Closing the documentation gap requires working at the provider level, prospectively, with a feedback loop that surfaces problems in months rather than quarters. It means measuring three things that most quality programs do not track: CPT II supplemental code capture rates by provider, ICD-10 diagnosis specificity scores by provider, and the delta between what the EHR contains and what actually appears in the EDPS submission.
The plans that consistently perform at four stars and above tend to share a common characteristic that has nothing to do with their member population or geography. Each month, they use a structured approach to track, at the provider level, whether care is documented in a manner visible to CMS. In 2025, only 40 percent of MA prescription drug plans achieved four stars or higher — a significant decline from 68 percent as recently as 2022.7 The plans maintaining consistent four-star performance are not doing something exotic. They measure documentation performance as carefully as they measure clinical outcomes.
| What Most Plans Do | What the Documentation Gap Requires |
|---|---|
| Chase HEDIS gaps with member outreach — letters, calls, reminders to schedule appointments | Fix the documentation pipeline so care already delivered gets credited — outreach is the last resort, not the first |
| Measure Stars performance at the plan level, quarterly | Measure documentation performance at the provider level, monthly — identify which physicians are creating gaps before they compound |
| Run retrospective HEDIS chart reviews to find missed numerator events after the fact | Establish prospective CPT II capture at point of care — eliminate the need for retrospective rescue by getting it right the first time |
| Address risk adjustment and quality as separate programs with separate vendors | Integrate quality documentation and risk adjustment into a single provider-level performance framework — the root cause is the same in both cases |
| Notify the medical director when a Stars miss is expected, usually 60 to 90 days before data lock | Operate a continuous documentation performance signal so issues surface 6–12 months before data lock, when intervention is still possible |
The Integration Advantage
There is a second dimension to this that rarely surfaces in Stars strategy conversations. The documentation behaviors that drive Stars gaps and the documentation behaviors that drive risk adjustment undercapture are the same behaviors. A physician who does not add CPT II code 3066F (urine protein testing for CKD) to an encounter is also the physician who is not coding the CKD diagnosis to its highest specificity — which means the HCC for chronic kidney disease is either missing or understated on the EDPS submission.
This is not a coincidence. It reflects the same underlying gap: a provider culture and infrastructure that treats documentation as billing compliance rather than as a clinical communication channel that drives both quality measurement and risk-adjusted payment. Plans that address Stars and risk adjustment as integrated documentation challenges consistently outperform plans that treat them separately.
The quality bonus payment for achieving four stars is material. But the 2025 Star Ratings results — with the number of five-star contracts dropping from 38 to just 7, and the overall average falling to 3.92 — signal that the bar is rising and the gap between high performers and the field is widening.8 Most of that gap is not in the member population. It is in the documentation pipeline.
Plans that treat Stars as a member engagement problem will keep running the same fall outreach campaigns. Plans that treat it as a documentation problem will find that the gap closes faster, at lower cost, and with far less disruption to their provider relationships.
What Needs to Change
If you are a plan medical director or Stars lead reading this, there are three questions worth asking before the next measurement year opens.
First: do you have a provider-level CPT II capture rate report, updated monthly, showing which physicians are and are not adding supplemental quality codes on eligible encounters? NCQA's own HEDIS guidance explicitly notes that providers should "include CPT II codes to provide additional details and reduce medical record requests" — yet most plans have no system for measuring whether their network is doing so.9
Second: do you have a system that checks what is recorded in the EHR against what is present in your EDPS accepted encounters, identifying any discrepancies before data lock? If that comparison is only happening during retrospective chart review, you are always solving last year's problem.
Third: is your quality improvement team working from the same provider-level data as your risk adjustment team? If those two functions have different analytics platforms, different vendor relationships, and different reporting cadences, you are almost certainly paying twice to fix the same root cause.
The plans that close the Stars documentation gap are not doing something exotic. They are doing something systematically. And in an environment where a fraction of a star point separates a quality bonus from a revenue miss, that is the most valuable program most MA plans have not built yet.
Curious what your plan's provider-level CPT II capture rate actually looks like? IQRP can run a documentation gap diagnostic for your largest contract and identify your top intervention targets.
Request a Consultation →- Biniek JF, Freed M, Damico A, Neuman T. Medicare Advantage Quality Bonus Payments Will Total at Least $12.7 Billion in 2025. KFF. September 2025. kff.org
- Fierce Healthcare. Medicare Advantage star ratings dipped slightly once again in 2025. October 11, 2024. (Reporting on Humana's 8-K filing of October 2, 2024, and subsequent legal action against CMS.) fiercehealthcare.com
- Centers for Medicare & Medicaid Services. Medicare 2026 Part C & D Star Ratings Technical Notes. Updated September 25, 2025. (Describes HEDIS administrative data collection methodology and use of encounter/claims data for Stars measure calculations.) cms.gov
- National Committee for Quality Assurance (NCQA). HEDIS MY 2024 Quick Reference Guide and HEDIS Volume 2: Technical Specifications for Health Plans, MY 2024. ncqa.org
- Centers for Medicare & Medicaid Services. 2026 Part C & D Star Ratings Technical Notes, Attachment G: Weights Assigned to Individual Performance Measures. September 2025. (Medication adherence measures carry 3x weight in Part D Star Ratings calculations.) cms.gov
- Centers for Medicare & Medicaid Services. 2025 Quality Rating System Measure Technical Specifications. April 2024. (Describes supplemental data submission requirements, audit standards, and the distinction between administrative, hybrid, and ECDS reporting methods.) cms.gov
- Certifi. 2025 Medicare Advantage Star Ratings: How Insurers Fared. December 2024. certifi.com
- Cotiviti. 3 Takeaways for Medicare Advantage Plans from the 2025 Star Ratings. October 2024. cotiviti.com
- Health Options / NCQA. HEDIS MY 2024 Quick Reference Guide. (Direct quotation: "Include CPT II codes to provide additional details and reduce medical record requests.") healthoptions.org