Medicare Star Ratings, Decoded: What 3.5 vs. 5 Stars Means Before You Switch
Medicare gives every Advantage and Part D plan a star rating from 1 to 5. Learn what the ratings measure, where to find them, and when they should influence your AEP decision.
Every fall, right before Annual Enrollment opens, Medicare publishes updated star ratings for every Medicare Advantage and Part D plan in the country. The scale runs from 1 to 5 stars, and those little gold stars carry more weight than most people realize.
What the stars measure
Star ratings are not about price. They are CMS's measure of plan quality and customer experience, drawn from dozens of indicators:
- How well the plan manages chronic conditions like diabetes and heart disease
- Whether members get recommended screenings and vaccines
- Customer service responsiveness and complaint rates
- How often members leave the plan
- For drug plans, how well the formulary covers common medications and how many members report problems at the pharmacy
A 5-star plan is rare. Most plans land between 3.5 and 4.5 stars.
Why the ratings matter to you
Three practical reasons:
- First, quality signal. A low-rated plan is often low-rated for reasons you would care about: slow prior authorizations, pharmacy headaches, or poor chronic care management
- Second, special enrollment right. Medicare lets you switch out of a plan rated below 3 stars into a plan rated 3.5 or higher at any time, not just during AEP. That is a meaningful escape hatch if your plan slips in quality
- Third, stability. Plans that consistently rate well tend to keep their benefits, networks, and drug coverage steadier year over year
Where to find a plan's rating
The official Medicare Plan Finder at medicare.gov shows star ratings next to every plan when you search by ZIP code. Each plan's rating is broken into categories, so you can see whether a plan scores well on drug coverage but poorly on customer service, or the reverse. Ratings refresh in October, so always check the current year's numbers rather than a brochure from last spring.
How much weight should the stars get?
Think of the rating as a tiebreaker and a red flag, not the deciding factor. Two plans can both be 4 stars while one covers your specific prescriptions at a fraction of the cost. The right order of operations is:
- First, confirm your doctors and prescriptions are covered at a cost you can live with
- Second, compare total annual cost across your realistic options
- Third, use star ratings to break ties and to rule out plans rated below 3.5 stars
One caution: a shiny 5-star plan marketed heavily on TV may still have a network that excludes your doctors. The stars measure quality of care and service, not whether the plan happens to fit your life.
If you want, I will pull the star ratings alongside costs and networks for every plan in your county during a free AEP review. It takes one appointment and you will see the full picture, not just the marketing.
Have questions about your specific situation?
Talk to Elie directly. Licensed in 15 states, based in the Midwest.