The Centers for Medicare and Medicaid Services has recalculated the quality star ratings for 2026 Medicare Advantage plans, a new government memo shows, after the health insurance industry filed yet another legal challenge targeting its scores. The revision adds another layer of uncertainty to a program whose bonus pool now stands at $16 billion for the current year — roughly the full annual budget of the Centers for Disease Control and Prevention, and a figure that has doubled since 2020.
What Star Ratings Are and Why They Control the Money
Medicare Advantage is the private-insurance alternative to traditional Medicare, sold by commercial health insurers to eligible beneficiaries. The federal government scores each plan on a five-star quality scale administered by CMS. Plans that earn at least four stars qualify for bonus payments funded by taxpayers. Those bonuses are not a rounding error: at $16 billion, they represent a substantial transfer from the federal treasury to the insurance industry, contingent entirely on where a plan lands on the rating scale. A plan that slips below the four-star threshold loses its bonus entirely — which gives insurers a powerful financial incentive to contest any score they believe is wrong, or that they can argue was calculated incorrectly.
A Pattern of Legal Challenges and Forced Recalculations
Over the past several years, health insurance companies selling Medicare Advantage plans have filed a sustained campaign of lawsuits against CMS challenging lower star ratings. The legal pressure has been largely unsuccessful — many insurers have lost their cases — but a handful of companies have won, and those victories have had system-wide consequences. Two years ago, federal judges ruled that CMS had erred in its original rating calculations, forcing the agency to redo the scores for the entire program. The current recalculation follows that same pattern: a legal action from the industry prompts a government review, and the ratings shift.
Who Sits Long, Who Sits Short
The practical flow is straightforward: insurers with plans hovering near the four-star cutoff have the most at stake, because crossing that line in either direction determines whether bonus payments arrive or disappear. CMS sits on the other side of that ledger, administering a bonus structure whose total cost has climbed sharply — doubling in five years — without a corresponding public accounting of whether the quality improvements the ratings are designed to measure have kept pace. The recalculation does not resolve that underlying question. It adds volatility to a program already under scrutiny, and it signals that the legal channel remains an effective lever for insurers seeking to move their scores.
What Comes Next
The core design tension is unchanged: bonus payments large enough to motivate aggressive litigation will continue to generate aggressive litigation. CMS has now been forced to recalculate Medicare Advantage star ratings at least twice in recent years under legal pressure. Whether the revised 2026 scores hold, or whether further challenges push the agency toward another revision, will depend on how courts evaluate the methodology behind this latest round of calculations — and on how many insurers decide the legal math still favors filing suit.