How to spot a bad Medicare Advantage plan: five red flags before you enroll

Short answer

There is no single “worst” Medicare Advantage plan — but there are plans that are wrong for you. The plans that get called “worst” in one article get 5-star ratings in another because they perform well for a different population. What matters is whether the plan fits your specific health needs, provider list, and geography. This article gives you five red flags you can check against any plan before enrolling.

Why “worst Medicare Advantage plans” is the wrong question

Articles that name specific “worst” Medicare Advantage plans are trying to answer the wrong question. The right question is not “which plans are bad” but “which plans are wrong for me.”

A Medicare Advantage plan that struggles for someone with multiple chronic conditions may perform very well for a healthy low-utilizer who just wants dental and vision benefits. A plan that gets criticized in one region for a narrow specialist network may have a broad network in another region. A plan with a middling star rating may have the specialist you need on its formulary in your ZIP code. If you want the foundational comparison between the two Medicare categories before you shop any plan, see our Medicare Advantage vs Medicare guide. For the seven category-level trade-offs that come with any Medicare Advantage plan, see our Medicare Advantage limitations guide.

The framework below flips the frame. Instead of a static list of plans to avoid, it gives you five red flags you can check against any plan you are considering. Where the plan you are looking at triggers two or more flags, keep looking.

Red flag 1 — A star rating below 3.5 with a declining trend

CMS publishes updated star ratings each October, and any plan below 3.5 stars is designated a “low performer” — CMS itself flags these plans and sends warning letters to the carrier. Below-3.5 is worth avoiding unless a specific reason applies (an SNP you qualify for, a plan uniquely available for your condition). For a full explanation of how star ratings work — the five domains they measure and what changed for 2026 — see our Medicare Advantage star ratings guide.

A static number is only half the picture. A plan holding at 3.5 stars year after year is different from a plan that was 4.5 stars two years ago and 3.5 today. Trend direction is often more informative than the current number.

How to check trend data

• CMS Part C and D Performance Data page — historical star ratings for every Medicare Advantage contract, going back several years.
• Medicare.gov Plan Finder — current rating alongside links to the underlying measure scores.

Compare this year’s overall rating against the prior 2 to 3 years. A declining plan is a plan whose underlying operations are getting worse — a warning sign that the current year’s rating may be lower than the trend suggests.

Red flag 2 — A high prior-authorization denial rate

Not all denials are wrong, and not all approvals are right. But a plan whose denial rate sits materially above peer plans in the same market is worth scrutinizing.

CMS-0057-F begins requiring public reporting of prior-authorization metrics in phased implementation through 2026 and 2027. As data phases in, you will be able to compare plans in your market on approval rates, denial rates, decision times, and overturn-on-appeal rates. When public data is available for a plan you are considering, look at the denial rate alongside the overturn-on-appeal rate.

What “materially above peers” means in practice

• Peer-group comparison within your county or state. A 15% denial rate looks different in a market where the median is 8% than in a market where the median is 14%.
• Overturn rate as a signal. A high overturn-on-appeal rate suggests the initial denials were procedurally rather than clinically driven — the plan is denying and then reversing rather than deciding accurately the first time.

Red flag 3 — A narrow network in your ZIP code

The plan’s national reputation matters less than whether your primary doctor and any specialist you rely on are in-network in your ZIP code. Medicare.gov Plan Finder lets you search by ZIP and by provider name.

If the plan looks good on paper but your cardiologist is not in-network, it is the wrong plan for you. Network breadth is plan-specific and geography-specific — the same plan can have a broad network in one county and a narrow one in the next.

How to check network breadth

• Search your primary doctor by name in Plan Finder — confirm the plan has them in-network.
• Search each specialist you rely on — every plan you are considering, every specialist by name.
• Check hospital networks by county — confirm your preferred hospital is in-network.
• Look at specialist density — one dermatologist in-network across the entire county is a red flag even if the plan has your primary doctor.

Red flag 4 — A high out-of-pocket max relative to peers

Every Medicare Advantage plan has an in-network out-of-pocket maximum, capped by CMS but set individually below the ceiling. Plans that sit near the maximum ceiling — with similar premium to plans that sit lower — are worth extra scrutiny.

If a hospitalization is on the cards for your condition, the difference between an out-of-pocket max of $5,000 and $8,850 is real dollars. A plan with a $0 monthly premium and a maximum-ceiling out-of-pocket max is not necessarily cheaper than a plan with a $30 monthly premium and a $5,000 out-of-pocket max — the math depends on your expected utilization.

Compare out-of-pocket max against the plans in your ZIP with a similar premium tier. Outliers deserve a closer look.

Red flag 5 — A high complaint ratio in CMS data

CMS tracks complaints per 1,000 enrollees for every Medicare Advantage contract. Complaint volumes above the peer-group median are a signal — often about customer service, claim processing, or marketing practices, but sometimes about care denials.

The complaint ratio is published in the same data set that generates the star ratings. Star ratings summarize it into a domain score; the raw ratio adds context. Two plans with the same “member complaints” domain score can have quite different raw complaint volumes when you look at the underlying number.

CMS Part C and D Performance Data publishes the underlying numbers. If a plan has an unusually high complaint ratio in the current year, look at prior years — is it a persistent pattern, or a one-year anomaly?

Putting the framework together

No single red flag by itself makes a plan wrong for you. But two or more red flags together should slow you down.

Here is the working framework:

1. Use star ratings as your first filter. Rule out anything below 3.5 stars unless a specific reason applies.
2. Check network breadth for your specific providers. If your primary doctor or a specialist you rely on is not in-network, the plan is not for you regardless of its rating.
3. Look at out-of-pocket max relative to peers with similar premium. Outliers near the CMS ceiling need scrutiny.
4. Where public data exists, check prior-authorization denial rates. Public reporting phases in through 2026 and 2027.
5. Check complaint volume in CMS data. Persistently high complaint ratios are a warning sign.

If two or more flags trigger on the same plan, keep looking. Compare against other plans in your ZIP that do not trigger those flags.

What Baba does for you at the evaluation stage

A patient advocate runs the five-flag framework against every plan on your shortlist. We map your provider list to each plan’s network, compare out-of-pocket max exposure against your expected utilization from your condition list, check CMS complaint data, and assess the trend on star ratings.

You end up with a shortlist that fits your situation — not a shortlist that ranks best in someone else’s article.

Frequently asked questions

How do I check a Medicare Advantage plan’s star rating?

Two ways. Medicare.gov Plan Finder shows the current star rating for every plan available in your ZIP code, alongside underlying domain scores. The CMS Part C and D Performance Data page publishes historical ratings and detailed measure-level data for research or trend analysis.

What is a low-performing Medicare Advantage plan by CMS definition?

CMS designates plans below 3.5 stars as “low performers.” Plans that receive a low-performer designation for three consecutive years may face contract termination by CMS. The designation is published on Medicare.gov, and beneficiaries in a low-performer plan can switch out of it during a Special Enrollment Period.

How do I find out if my doctor is in a plan’s network?

Search Medicare.gov Plan Finder by ZIP code and by provider name. Every plan available in your ZIP appears alongside a link to check whether specific providers are in-network. You can also call the plan directly to confirm — network data on public sites can lag by weeks.

Where is prior authorization denial data published?

Under CMS-0057-F (the Interoperability and Prior Authorization Final Rule), public reporting of plan-level prior-authorization metrics phases in through 2026 and 2027. Data will include approval rates, denial rates, decision times, and overturn-on-appeal rates. Until public data is fully available for your market, KFF analyses and CMS complaint tracking are the closest proxies.

Are there Medicare Advantage plans I should avoid completely?

No plan is universally worth avoiding, but plans that trigger two or more of the five red flags above deserve a closer look — and are usually worth passing on if alternatives exist in your ZIP code. What matters is whether the plan fits your specific health needs, provider list, and geography — not what an article ranks it in a national list.

This information is for educational purposes and should not substitute for professional guidance. Healthcare coverage details vary by individual plan. Consult with Baba’s support team or your insurance provider for information specific to your situation.