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.