Medicare Advantage Part C Benchmark Rates, Star Ratings Rebate Percentages & Risk Adjustment Scores
A healthcare actuarial analysis of CMS Medicare Advantage county benchmark payment rates, HCC risk adjustment scores, and quality bonus rebate percentages.
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Empirical Analysis & Findings
## Medicare Advantage Capitation Rate Architecture
Private Medicare Advantage (Part C) plans are compensated through CMS monthly capitation payments determined by competing bids submitted against statutory county benchmarks, adjusted for individual beneficiary Hierarchical Condition Category (HCC) risk scores.
### 1. Bid vs Benchmark Economics and Plan Rebate Percentages
When an MCO submits a bid below the county benchmark, the plan receives its bid plus a statutory percentage of the difference as a 'rebate' that must be returned to enrollees as supplemental benefits (dental, vision, hearing, lower Part B copays):
| Quality Star Rating | Statutory Rebate Percentage | Quality Bonus Adjustment | Mean Supplemental Benefit Allocation |
|:--------------------|:---------------------------:|:------------------------:|:-------------------------------------|
| 5.0 Stars | 70% of Savings | +5.0% Benchmark Increase | $185 / member / month |
| 4.5 Stars | 65% of Savings | +5.0% Benchmark Increase | $152 / member / month |
| 4.0 Stars | 65% of Savings | +5.0% Benchmark Increase | $140 / member / month |
| 3.5 Stars | 50% of Savings | 0.0% Bonus | $84 / member / month |
| 3.0 Stars or Below | 50% of Savings | 0.0% Bonus | $55 / member / month |
### 2. HCC Risk Adjustment Coding Intensity
CMS applies the CMS-HCC risk adjustment model to calibrate monthly plan disbursements. Every documented chronic condition adds an incremental risk coefficient (e.g. Type 2 Diabetes with complications adds +0.312, congestive heart failure adds +0.368), multiplying baseline county benchmarks by the aggregate beneficiary risk score.
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Frequently Asked Questions
How are Medicare Advantage plans funded by the government?
CMS pays Medicare Advantage plans a monthly capitation payment per member based on the plan's annual bid relative to county benchmark costs, multiplied by each enrollee's clinical risk score (HCC score).
What is the significance of the 4-star threshold in Medicare Advantage?
Plans achieving 4.0 stars or higher receive a 5.0% quality bonus increase to their county benchmark payment and capture higher rebate percentages (65% to 70%), dramatically increasing their budget for zero-dollar premiums and rich supplemental benefits.
Technical Tradeoff References
Compare architectural characteristics, performance benchmarks, and mathematical formulas side-by-side:
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