Risk adjustment matters more in MA than anywhere else, because it sets the payment for 35 million people. This lesson covers how it works here.
The introductory course explained risk adjustment as the machinery that makes payment and comparison fair. Medicare Advantage is where that machinery carries the most money, and therefore where its imperfections matter most.
How it works here
MA uses the CMS Hierarchical Condition Category model covered in the intro course: recorded diagnoses map to weighted condition categories, which sum with demographic factors into a risk score normalized so the average beneficiary is 1.0. The plan’s payment for each enrollee scales with that score. A member scoring 2.0 brings roughly twice the payment of an average member.
Worth remembering: in MA the risk score is a multiplier on the payment for every one of roughly 35 million people. A shift of a few percentage points in average scores across that population is worth billions of dollars. That is the entire reason risk adjustment in MA is so heavily scrutinized, litigated, and audited. The stakes are not academic.
Why the design invites pressure
The structural problem from the intro course applies here with full force. Payment follows recorded diagnoses, and those diagnoses are recorded by, or on behalf of, the organizations whose revenue depends on them. Documenting a condition more completely raises the score and the payment.
Complete documentation is legitimate and clinically valuable. Documentation pursued primarily to raise scores is not. The line between them is genuinely blurry, and an entire industry operates along it, which the next lesson quantifies.
The v28 model
CMS has revised the model to reduce that pressure. The current version, known as v28, restructured the condition categories around ICD-10 and removed a number of diagnoses associated with coding variation from risk-adjusted payment. It was phased in over three years, reaching full weight in 2026.
The intent was to make the model harder to game by taking the most easily manipulated codes out of it. Whether it succeeded is a measurable question, and the next lesson reports what the measurements show.
Key takeaways
- MA risk scores multiply the capitation payment for each enrollee, so small average shifts move billions of dollars.
- Payment follows recorded diagnoses recorded by parties whose revenue depends on them, which is the structural source of coding pressure.
- The v28 model restructured categories and removed diagnoses prone to coding variation, reaching full phase-in in 2026.
Sources
Check your understanding
Why does risk adjustment carry more financial weight in Medicare Advantage than in most other programs?
In MA the risk score multiplies the payment for each of roughly 35 million enrollees. A small average shift in scores translates into billions of dollars, which is what makes coding practices so consequential.