Medicare Advantage Star Ratings: What They Mean and How to Use Them

Every fall, the Centers for Medicare and Medicaid Services publishes star ratings for every Medicare Advantage and Part D plan in the country. Plans are rated on a scale of one to five stars based on dozens of quality measures covering clinical outcomes, member experience, administrative performance, and plan management. Star ratings matter for two reasons: they give you a signal about plan quality beyond premium and benefit comparisons, and five-star plans carry a special enrollment privilege that no other plan has.

Bryce's Take

I use star ratings as one input among several, not the deciding factor. A 5-star plan that does not include your oncologist in-network is not better for your situation than a 4-star plan that does. The special enrollment privilege for 5-star plans is useful if your circumstances change mid-year. But never let a star rating override the network and formulary check.

What star ratings measure

CMS calculates star ratings from data across several categories. Health outcomes measures cover how well the plan manages chronic conditions like diabetes, heart disease, and COPD, including medication adherence, blood pressure control, and preventive care utilization. Member experience measures capture how enrollees rate their plan, including satisfaction with care coordination, access to care, and customer service. Administrative measures assess how the plan handles appeals and grievances, accuracy of its information, and compliance with CMS requirements. Each measure is weighted, and the composite score produces the plan's overall star rating on the 1 to 5 scale.

What the star ratings indicate about plan quality

A 4 or 5 star plan generally reflects strong clinical performance, good member outcomes, and effective administration. A 2 or 3 star plan may indicate deficiencies in care management, poor member experience scores, or administrative problems. CMS provides financial bonuses to plans that achieve 4 stars or higher, which plans typically use to fund additional benefits. However, star ratings are retrospective measures based on the prior year's data, and a plan's rating in the fall publication reflects performance from the year before enrollment. A plan can improve or decline after its rating is published.

The 5-star special enrollment period

The most concrete planning value of the star ratings is this: if a 5-star Medicare Advantage plan or 5-star Part D plan is available in your area, you can switch to it at any time between December 8 and November 30 of the following year. This is the only enrollment period outside AEP and SEPs that allows plan switching for non-urgent reasons, and it requires only that the plan has achieved 5 stars. If you are dissatisfied with your current plan and a 5-star alternative is available in your area, you do not have to wait for AEP. You can make the switch immediately.

How to find and compare star ratings

CMS publishes star ratings annually in October. The Medicare Plan Finder at medicare.gov displays star ratings alongside premium, benefits, and formulary information when you compare plans in your area. You can filter by star rating to see only highly rated plans. Third-party resources including Medicare Interactive and Plan Finder alternatives also display ratings. Note that not every plan in your area will be rated, new plans in their first year of operation are not yet rated and display without stars.

Limitations of star ratings

Star ratings are not a complete picture of plan quality for your specific situation. A plan can have 5 stars overall but have a limited network that does not include your preferred physicians. A 3-star plan might have the only in-network orthopedic surgeon you need. Star ratings reflect average performance across a broad population, not specifically how the plan performs for someone with your conditions and utilization patterns. Use star ratings as one input in plan evaluation alongside network verification, formulary review, and total cost analysis.

Bryce Casson

Licensed Independent Medicare Broker

Bryce Casson is an independent Medicare insurance broker who works with every major carrier. He does not represent any single insurer, which means his recommendations are based on what actually fits each client's situation, not on commissions or quotas.