What Medicare 5 stars really means
5 star rating mistakes to avoid before choosing a Medicare plan.
A high star rating is a good sign — but treated the wrong way, it can also lead you to a plan that doesn’t fit. Here are the mistakes people make most often, and a quick checklist to sidestep them.
Each October, CMS publishes a fresh set of Medicare star ratings for every Medicare Advantage and Part D plan on the market — a score from one to five stars built from quality data collected across the year. 5 star Medicare Advantage plans represent the top of that scale, and they’re worth paying attention to.
Where people run into trouble isn’t the rating itself — it’s how they use it. Below are the most common Medicare star rating mistakes, each paired with a simple fix.
None of this is a knock against star ratings as a tool. They’re one of the better shortcuts Medicare offers for judging plan quality at a glance, built from real performance data rather than marketing copy. The mistakes below aren’t about distrusting the number — they’re about understanding exactly what it does and doesn’t measure, so it gets used the way it was actually designed to be used.
The mistakes people make most often
Treating the star rating as the entire decision
A 5 star Medicare Advantage plan measures quality and member satisfaction — not whether your own doctors are in its network or your prescriptions are priced reasonably on its formulary. It’s entirely possible for a plan to be the highest-rated option in your county and still be a poor personal fit.
Use the rating to shortlist plans, then check network and formulary before deciding.
Assuming last year’s rating still applies
How often do Medicare star ratings change? Every year, without exception. A plan that earned 5 stars previously isn’t guaranteed to hold that score going forward, and a plan that dips low for several years running even gets flagged separately by CMS as a low performer.
Check the current year’s rating directly rather than relying on memory.
Not checking whether a 5-star plan is even sold near you
Availability of Medicare Advantage 5 star plans varies significantly by county. Some areas have several; others have none at all — which means a national “best plans” list can point you toward options you can’t actually enroll in.
Search by ZIP code on the Medicare Plan Finder before assuming one is available.
Overlooking the Medicare 5 star special enrollment period
Many people don’t realize that if a top-rated plan becomes available in their area, they can switch into it once a year outside the standard Annual Enrollment window — a genuinely useful option that goes unused simply because people don’t know it exists.
Ask specifically about the 5-star special enrollment period if a new top-rated plan shows up mid-year.
Ignoring cost in favor of the rating alone
Medicare star rating vs cost is a real trade-off some people miss. A top-rated plan with a network or formulary mismatch can quietly cost more than a slightly lower-rated plan that actually fits — the rating says nothing about what you’ll actually pay out of pocket over the year.
Compare total yearly cost — premium, deductible, and copays — not just the star count.
What the rating is actually measuring
Curious how Medicare star ratings work under the hood? CMS pulls together dozens of individual performance measures — things like how well a plan helps members manage chronic conditions, how satisfied members are with their care, how responsive the plan is to complaints, and how its customer service performs — and rolls all of it into one overall score from one to five stars.
That’s genuinely useful information. It just isn’t personal information. The rating tells you how a plan performs on average across its entire membership, not how it will perform specifically for your doctors, your prescriptions, or your health situation. Both things can be true at once: a plan can have excellent average performance and still be a mismatch for your specific needs.
A quick 5-star Medicare plan checklist
Before choosing a 5-star Medicare plan, run through these five checks.
- Confirm your doctors and specialists are in-network
- Check your prescriptions against the plan’s formulary and pricing tiers
- Add up total yearly cost, not just the premium
- Verify the plan’s service area actually covers where you live and travel
- Double-check this year’s rating directly, rather than trusting last year’s
Where this fits with your other coverage
A star rating is just one input — here’s how it connects to the rest of your options.
Medicare Supplement
Not part of the star rating system, since it isn’t a care-delivery plan.
Learn more →A few common questions
What does a 5 star Medicare plan mean?
It means CMS placed that plan in its top quality tier for the year, based on member satisfaction and performance data — a strong signal, not a guarantee it fits your specific situation.
How do I compare Medicare Advantage star ratings properly?
Pull up each plan’s rating on the Medicare Plan Finder, then set it beside your actual doctors, prescriptions, and total cost before making a decision — the rating alone isn’t enough.
What makes a Medicare Advantage plan earn 5 stars?
Strong, consistent performance across CMS’s quality measures — preventive care, chronic condition management, customer service, and complaint handling — combined into one overall score.
Is a lower-rated plan ever the better choice?
Yes, fairly often. If a 4-star plan includes your doctors and prices your prescriptions better than the 5-star option in your area, the 4-star plan can be the smarter pick in practice.
How far in advance should I start checking star ratings?
As soon as they’re published each October, right before Annual Enrollment opens. Starting early gives you enough time to actually run a plan’s network and formulary against your needs, rather than rushing a decision in the final days before the deadline.
The bottom line
None of these mistakes come from carelessness — they come from treating a single number as the whole story. A star rating is a genuinely useful filter for narrowing a long list of plans, but the final decision still depends on details the rating was never built to capture.
Use the checklist above as your actual decision-maker, and let the star rating do the job it’s good at: narrowing a long, confusing list down to a handful of plans worth a closer look in the first place.
If you’d rather not run that comparison alone, a licensed agent can check which 5-star Medicare Advantage plans are actually available where you live, and how they stack up against your specific doctors and prescriptions — at no cost to you.