CMS released draft 2027 Star Ratings cutpoints to plans through the preview process in September. An analysis by the Newton Smith Group found roughly half of cutpoints moved harder, concentrated in HEDIS. Final ratings post in early October. The mechanic worth modeling is not bonus eligibility but the rebate percentage step between 4.5 and 4.0 stars.
The number that already happened is more useful than the one being forecast. In 2026, 68% of Medicare Advantage enrollees are in plans that qualify for the quality bonus program, down from 75% in 2025 — the lowest share since 2018, on KFF's analysis of CMS enrollment and star ratings files. The mechanism was cutpoints. 209 Medicare Advantage contracts achieved at least a 4-star rating for 2026, against 261 the prior year. Total quality bonus program spending still rose, to at least $13.4 billion from $12.7 billion, because enrollment and qualifying contracts are concentrated among large MA sponsors — but the count of qualifying contracts fell by a fifth.
That is the base rate against which to read this month's draft 2027 cutpoints.
CMS released draft cutpoints to plans through the second plan preview in September. They are not public. According to a Newton Smith Group analysis, as reported by Healthcare Dive, roughly 50% of cutpoints moved harder, about a third held flat, and 17% eased — with the tightening concentrated in HEDIS measures and the flat third concentrated in CAHPS.
Two measures moved far enough to reshape a contract on their own. Kidney Health Evaluation for Patients with Diabetes rose 7 to 10 points depending on the star threshold. Colorectal Cancer Screening tightened 4 to 11 points, according to RISE Health's review of the draft preview materials. One structural detail: KED is a newer measure with fewer than three years of data in the Star Ratings program, so the normal guardrail limiting year-over-year cutpoint movement did not apply in this preview cycle.
Sell-side work is already circulating. Leerink's Whit Mayo, applying last year's performance to the draft grid, projected that UnitedHealthcare's largest contract could slip from 4.5 to 4.0 stars absent performance gains, with Humana's ratings relatively stable.
A 4.5-to-4.0 move reads like a rounding error, because most coverage of star ratings treats the 4.0 line as the only cliff. For qualifying contracts, a 4.0-or-higher rating generally triggers a quality-bonus increase to the benchmark. That is the eligibility cliff, and a contract moving from 4.5 to 4.0 does not cross it.
What it crosses is the rebate percentage: the share of the difference between the benchmark and the plan's bid that the plan keeps to fund supplemental benefits, reduced premiums, or lower member cost-sharing. That share is 70% at 4.5 stars and above, 65% from 3.5 up to 4.5, and 50% below 3.5. A contract sliding from 4.5 to 4.0 keeps its benchmark bonus and loses five percentage points of the benchmark-bid spread.
Consider a simplified illustration: a $1,000 benchmark, a 5% quality-bonus adjustment, and a bid $200 below the resulting $1,050 benchmark. At 4.5 stars, the 70% rebate is $140 per member per month. At 4.0 stars, the 65% rebate is $130 per member per month. Those rebate dollars support supplemental benefits, reduced premiums, or lower member cost-sharing — so the impact appears in competitive benefit design as much as in plan economics.
That is the sensitivity the draft file is actually testing. Not how many contracts fall below 4.0, but how many sit at 4.5 with a HEDIS measure moving 7 to 10 points underneath them.
On KFF's 2026 figures, UnitedHealth Group holds 26% of MA enrollment and receives 29% of quality bonus program spending — $3.9 billion. Humana holds 20% of enrollment and receives 11% of bonus spending — $1.5 billion, following a prior-year drop when one of its largest contracts fell from 4.5 to 3.5. At the far end, Centene's average bonus-driven payment increase is $23 per enrollee; Kaiser's is $577.
Following litigation brought by Clover Health, CMS recalculated certain 2026 Star Ratings. KFF estimated that the recalculation would increase federal quality-bonus spending by roughly $600 million in 2027, with UnitedHealth Group expected to see the largest increase.
CMS is expected to release final 2027 Star Ratings in early October. The work inside plans between now and then is verification: reconciling submitted rates against the preview file, checking enrollment and contract crosswalks, and filing corrections.
Two things to watch once ratings post: contract-level movement at the 4.5 boundary specifically, not the count above and below 4.0 — the rebate step is where the dollars move for carriers that already have bonus status. And any carrier commentary on 2028 benefit design and bid assumptions.
Sources: KFF, "Medicare Will Spend More Than $13 Billion on the Medicare Advantage Quality Bonus Program in 2026," August 12, 2026; Healthcare Dive, "Half of Medicare Advantage stars thresholds harder to reach in 2027," September 10, 2026; RISE Health, September 11, 2026; KFF, Medicare Advantage Quality Bonus Payments data.
This is analysis, not investment advice. Continuum does not make recommendations to buy or sell securities.
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