Employer and union Medicare Advantage plans collect an extra $466 per enrollee this year under the quality bonus program, individual plans $381, and special needs plans $318 (KFF, July 2026). Only 209 MA contracts cleared the 4-star cutoff that triggers those payments in 2026, down from 261 in 2025, a bonus that flows entirely through the benchmark and never arrives as a separate check.
Aggregate program spending still climbed to $13.4 billion in 2026 from $12.7 billion in 2025, more than quadruple the $3.0 billion the program cost in 2015 (KFF, July 2026). What changed is who is left qualifying. The share of Medicare Advantage's 35.4 million enrollees (KFF, June 2026) sitting in a bonus-qualified contract fell to 68%, about 24 million people, from 75% a year earlier, the lowest qualifying share since 2018. A seven-point drop in the qualifying rate against a growing enrollment base means roughly 2.5 million more enrollees are now in plans locked out of the benchmark bump, even as the dollars flowing to the plans that remain qualified keep rising.
The Benchmark Mechanic: A Bonus That Never Arrives as a Check
The Affordable Care Act created the quality bonus program in 2010 to reward Medicare Advantage contracts rated 4 stars or higher, and the payment mechanism it chose was structural rather than transactional. A qualifying contract's county benchmark, the ceiling CMS sets on what it will pay a plan per enrollee, rises by 5 percentage points, or by 10 points in designated double-bonus counties, dense urban markets with historically low traditional Medicare spending (KFF, July 2026). New contracts and low-enrollment plans get a flat 3.5-point bump regardless of star performance, a separate provision meant to give newly entered plans room to build a quality track record before they are judged on it.
That benchmark increase only becomes money once it interacts with a second CMS mechanism: the rebate. If a plan's bid for covering Part A and B benefits comes in below its benchmark, CMS pays the plan its bid and returns a share of the gap as a rebate the plan must spend on supplemental benefits, reduced cost-sharing, or premium buydowns. The share of that gap a plan keeps is itself graduated by star rating: 50% for contracts at 3 stars or below, 65% for 3.5 and 4 stars, and 70% for 4.5 stars and above (KFF, 2026). A 4-star contract benefits twice over, from both the higher benchmark and the higher rebate share, while a 3.75-star contract gets the 65% rebate share with no benchmark bump at all.
| Star Rating Tier | Quality Bonus Benchmark Bump | Rebate Share of Bid-Benchmark Gap |
|---|---|---|
| Below 3.5 stars | None | 50% |
| 3.5 to 3.99 stars | None | 65% |
| 4.0 to 4.49 stars | +5 pts (+10 in double-bonus counties) | 65% |
| 4.5 stars and above | +5 pts (+10 in double-bonus counties) | 70% |
Per-Enrollee Value Diverges by Plan Type
The average annual bonus value per enrollee is not uniform across the three broad Medicare Advantage plan categories. Employer and union group plans gain $466 per enrollee, individual market plans gain $381, and special needs plans gain $318 (KFF, July 2026). The employer and union figure sits highest because those group waiver plans are concentrated among a small number of large national carriers that have invested heavily in the clinical and operational infrastructure star ratings reward, from HEDIS clinical measures to member experience surveys. Individual market plans span a wider quality distribution because they compete on price and benefit design across thousands of county-level bids, so the average blends strong performers with plans that never cleared 4 stars in the first place.
Special needs plans carry the lowest per-enrollee bonus value even as dual-eligible special needs plan enrollment has tripled in recent years, because SNPs serve populations with higher social risk and more fragmented care histories that make the underlying HEDIS and patient experience measures harder to move. That gap matters for benefit design. Rebate dollars fund the extra items Medicare Advantage members shop for: dental, vision, hearing, over-the-counter allowances, and transportation. A plan sitting at the SNP tier's lower average bonus has less room to compete on supplemental richness than an employer plan operating in the same county. The widening spread between what MA plans advertise in benefits and what the underlying bonus economics can actually fund is the same tension KFF's 2026 premiums and benefits analysis flagged from the member-facing side.
Why the Qualified Share Fell to 68% From 75%
The qualifying share did not fall because plans got worse at delivering care. It fell because CMS moved the goalposts. Most of the cut points that separate one star tier from the next kept rising: 63% of the thresholds needed to hit 4 stars got harder to clear in 2026, following 70% that rose in 2025, so a plan had to improve on the same measure two years running just to hold a rating it already had (Wakely, 2026).
CMS layered two structural changes into that rising bar. First, the weight assigned to patient experience, complaints, and access measures dropped from 4 to 2, shifting the overall score toward clinical outcomes measures that are harder for a plan to move quickly through member-facing service investments (RISE, 2026). Second, the phased-in Tukey outlier deletion methodology, which strips statistical outliers before setting a cut point, continued migrating toward full implementation, while the guardrails that had capped how far 2 and 3-star cut points could move in a single year kept tapering. The combined effect pushed cut points to the highest levels in the program's history, and 209 contracts cleared the resulting 4-star bar in 2026, down from 261 in 2025, 52 fewer contracts (KFF, July 2026). Elevance's litigation over its own prior-year cut points shows how contested that measurement has become for carriers on the wrong side of a threshold.
Bonus Dollars Concentrate at Scale
A shrinking qualified base does not shrink evenly across carriers. UnitedHealth Group receives the largest total increase from the program, $3.9 billion, representing 29% of all quality bonus spending while UnitedHealth enrolls 26% of the MA population (KFF, July 2026). Humana receives $1.5 billion, or 11% of the total, against a 20% enrollment share. Kaiser Foundation Health Plans post the highest per-enrollee average bonus value in the industry at $577, reflecting that essentially all of Kaiser's MA enrollees sit in qualifying contracts. Centene sits at the opposite end, averaging just $23 per enrollee, because only 6% of its MA enrollees are in a plan that clears 4 stars.
That spread is the actuarial story behind the aggregate $13.4 billion figure. A national total that keeps climbing while the qualifying enrollee share falls is consistent with dollars concentrating in fewer, larger, higher-scale contracts rather than spreading across the market. Carriers whose MA book sits disproportionately in newly non-qualifying contracts, the Centene pattern rather than the Kaiser pattern, lose rebate-funded benefit capacity precisely as their peers gain it, widening the competitive gap in supplemental benefit richness heading into 2027 bids.
For carriers whose enrollment sits heavily in newly non-qualifying contracts, the read-through extends beyond next year's benefit design. Medicare Advantage plans must meet an 85% medical loss ratio floor, and rebate dollars that fund supplemental benefits or premium buydowns count as plan revenue subject to that floor. Losing them does not just shrink the benefit package; it compresses the margin cushion a plan holds against MLR rebate exposure to CMS. A carrier managing quarterly risk-based capital targets across a multi-state MA book needs the qualifying-contract mix as an input to statutory surplus projections, not just to marketing collateral, since a contract that drops out of the bonus tier changes both its revenue base and the loss ratio denominator against which regulators measure it.
MedPAC's Critique and the Coding Intensity Overlay
The Medicare Payment Advisory Commission has flagged the program's design for years, and its March 2026 report to Congress restated the concern in blunt terms. The commission "continues to be concerned that the MA quality-bonus program and star-rating system are not adequate to assess the quality of care that MA enrollees can expect to receive" (MedPAC, March 2026). MedPAC's recommendations call for replacing the bonus program with more equitable benchmarks and better encounter data, arguing the current structure rewards contract-level scale and administrative capacity as much as clinical quality.
KFF's own estimates suggest the bonus program does not operate in isolation from a separate benchmark distortion. Total MA payments in 2026 run $76 billion higher than traditional Medicare would have spent covering the same beneficiaries, and KFF attributes $28 billion of that gap specifically to coding intensity, the tendency of MA risk adjustment to capture more diagnoses per beneficiary than fee-for-service Medicare does for comparable patients (KFF, "Decoding Medicare Advantage Coding Intensity," 2026). Because both the quality bonus and coding intensity operate through the same risk-adjusted benchmark, a contract that is both highly rated and aggressively coded compounds the two effects rather than experiencing them separately. KFF's July analysis notes its $13.4 billion bonus estimate is itself a lower bound because it assumes enrollees have average health status when actual coded risk scores run higher.
What a Lost Bonus Star Does to Rebate Dollars and 2027 Bids
The mechanics compound in a way that is easy to underweight in a bid model built around star rating as a pass or fail input rather than a continuous margin variable. Take a contract with a $1,050 risk-adjusted county benchmark at 4 stars and a $950 bid, a $100 gap. At the 65% rebate share, that contract nets $65 per member per month in rebate dollars, about $780 per enrollee annually, in the range of the $466 to $318 per-enrollee figures KFF reports across plan types. Drop that same contract to 3.75 stars, and it loses the 5-point benchmark bump. If the benchmark reverts to $1,000, the bid-benchmark gap narrows to $50, and even holding the 65% rebate share, since 3.5 to 4 stars still qualifies for that tier, the rebate falls to $32.50 per member per month, or roughly $390 annually, half the prior value. The star cutoff does not move revenue in a straight line. Losing the benchmark bump alone can cut rebate dollars in half before the rebate-share tier itself changes.
That nonlinearity is what makes the star cutoff a bid-margin variable rather than a quality department's scorecard. 2027 bids were filed against a 2.48% CMS effective rate that already runs below medical cost trend, and a contract that models its supplemental benefit richness off a 4-star rebate assumption before CMS finalizes cut points is exposed twice, once to the rate environment and again to a star recalculation that could reclassify the contract below the bump after benefit design is locked. Plans absorbing enrollees from carrier exits and forced disenrollment already face a similar timing mismatch; a lost bonus star adds a second lever moving in the same direction on the same bid cycle. The practical response is treating the star cutoff probabilistically in bid development, building a range of rebate scenarios around the cut-point uncertainty CMS's technical notes disclose each year, rather than assuming the prior year's rating carries forward unchanged.
The CY2027 Overhaul Waiting Behind the Current Tightening
The tightening trend running through 2026 is not the last word on how CMS scores Medicare Advantage quality. CMS finalized a separate overhaul eliminating 11 star rating measures, including call center performance, appeals, and provider complaint metrics, and removing the health equity index bonus program introduced under the prior administration (Healthcare Dive, 2026). CMS estimates the changes will cost the federal government more than $18 billion over the next decade, largely by reinstating a more generous bonus structure than the health equity index would have produced. The rule takes effect for the 2027 measurement year, meaning it first shows up in star ratings released in 2029, not the 2027 or 2028 cycles plans are pricing now.
That gap matters for how far forward actuaries should extrapolate the current cut-point trend. The 2026 tightening, the weight shift toward clinical measures, and the Tukey methodology migration are all playing out under the measurement framework that predates the CY2027 overhaul. A plan's 2027 and 2028 bids should assume the tightening trend documented here continues, but a five-year rebate revenue projection built on a straight-line extrapolation of 2024 to 2026 cut-point movement needs a discontinuity built in for the 2029 ratings, when fewer measures and a different bonus calculus take over.
The number that led every headline out of KFF's July release was $13.4 billion, a record for the program. The number that changes how a plan actuary should build a 2027 rebate assumption is 68%, the share of enrollees whose plans still clear the bar that turns a star rating into benchmark dollars. A contract sitting at 3.75 stars this year is one measure-level cut point away from either side of that line, and the dollars attached to which side it lands on no longer round to a rounding error in the bid.