Every October, CMS quietly posts a spreadsheet, and every October it moves more money into insurer earnings than most product launches ever will. The Medicare Advantage Star Ratings program grades every MA contract 1 to 5 stars on roughly 40 quality measures — screenings, complaints, call-center hold times, medication adherence. Score 4 stars or higher and CMS lifts your county benchmark payment rate by 5% (3.5% for double-bonus counties); score below 4 and you get nothing extra. Multiply that percentage across millions of enrollees and the "quality bonus" line becomes one of the largest standing subsidies in American healthcare. KFF pegs 2026 program spending at more than $13 billion, with 68% of MA enrollees sitting in bonus-qualifying plans. That check gets cut whether or not the insurer wins a single new member — it's a rate hike CMS applies to the book of business you already have.
Who cashes in. UnitedHealth (UNH) runs the largest MA book in the country and, per its own 2026 disclosures, keeps roughly 78% of members in 4-star-or-better plans — more scale in the bonus pool than any competitor, converting star performance into a durable per-member-per-month payment advantage few rivals can match. Elevance Health (ELV), still building out its Medicare book after the Wellpoint/Amerigroup consolidation, now has roughly 55% of its MA members in top-rated plans for 2026 — a steady climb that turns star ratings into real margin support just as its MA segment scales. CVS Health (CVS), through Aetna, has spent two years rebuilding stars after a 2024 collapse; any recovery back toward 4-star territory is a direct tailwind to a segment that's been the company's single biggest earnings drag, making incremental star improvement disproportionately valuable to the stock.