Medicare Advantage Star Ratings: What They Mean and Why They Matter

Medicare Advantage plans are sold by private insurance companies. That's a problem from a consumer protection standpoint — without external accountability, there's no mechanism to distinguish a well-run plan that actually delivers good care from one that markets aggressively, collects premiums, and then makes accessing care as difficult as possible.

The star rating system is CMS's attempt to create that accountability. It launched in 2008 as a simple bonus payment mechanism and evolved into the most comprehensive quality measurement system in private insurance. Today, a plan's star rating determines how much bonus money it receives from CMS — which in turn directly affects how many extra benefits it can afford to offer you.

The system isn't perfect. Critics have raised valid concerns about rating inflation, methodological changes that made ratings less meaningful, and the fact that some metrics measure what's easy to measure rather than what actually matters. But it's the best independent quality signal available to Medicare Advantage enrollees, and understanding it makes you a dramatically better plan consumer.

For 2026, the average Medicare Advantage star rating is 3.66 — essentially flat from 3.65 in 2025. About 40% of contracts earned 4+ stars, qualifying for maximum bonus payments. Eighteen contracts achieved 5 stars, up from seven in 2025.

Each Medicare Advantage contract gets a single overall star rating that's a weighted average of performance across multiple measure domains.

For MA-PD contracts (plans that include prescription drug coverage, which is most plans), CMS rates performance on up to 40 separate measures. MA-only contracts (no drug coverage) are rated on up to 30 measures. Standalone Part D drug plans get up to 12 measures.

The measures fall into several categories:

Chronic condition management: How well does the plan manage patients with diabetes, heart disease, osteoporosis, and other chronic conditions? This includes measures like diabetes HbA1c control, cholesterol management for cardiovascular patients, and breast cancer screening rates.

Patient experience and member satisfaction: CMS uses CAHPS surveys (Consumer Assessment of Healthcare Providers and Systems) to measure member satisfaction with the plan, their doctors, drug plan customer service, and care coordination. These surveys are conducted annually with a sample of enrollees.

Access and availability: Can members get appointments with PCPs and specialists in a timely way? Are care gaps being addressed? Are preventive services being delivered?

Customer service: Response times for coverage decisions, appeals processing, accuracy of plan information, drug pricing accuracy.

Medication safety and adherence: For Part D, measures like medication adherence for chronic conditions (statins, diabetes medications, hypertension medications) and high-risk medication avoidance in seniors.

For each measure, CMS establishes performance thresholds (called cut points) that determine whether a contract scores 1–5 stars on that individual measure. The overall contract rating is a weighted average, with patient experience and access measures weighted more heavily than some administrative measures.

The weighting was overhauled in recent years. Patient experience measures and outcomes measures now carry more weight than pure process measures, which was the right call — whether members actually feel cared for matters more than whether the plan sent a care gap notification letter.

The star threshold that matters financially is 4 stars — specifically, the difference between 3.5 and 4.0 stars.

Plans with 4+ stars qualify for a quality bonus payment from CMS — currently up to 5% above their base benchmark payment. This is real money at scale. A plan with 500,000 enrollees receiving an extra 5% in capitation payments has potentially hundreds of millions of additional dollars to work with. That money goes into benefits: lower premiums, better cost-sharing, richer supplemental benefits, more extra services.

The gap between a 3.5-star plan and a 4.5-star plan can directly translate to hundreds of dollars per year in real value to the consumer.

5-star plans have additional significance. CMS grants a continuous Special Enrollment Period for 5-star plans — from December 8 of the prior year through November 30 of the plan year, you can switch to a 5-star plan at any time, no qualifying life event required. This is one of the only ways to switch Medicare Advantage plans outside the standard enrollment windows.

For 2026, there are 18 contracts at 5 stars. They're geographically scattered — you may or may not have one available in your area. But if you do, and your current plan is underperforming, the 5-star SEP gives you a midyear exit.

The 2026 star ratings story has a few major plotlines.

More 5-star plans, but the same average: Eighteen contracts earned 5 stars in 2026, up from 7 in 2025. That sounds like a big improvement, but the average rating barely moved (3.66 vs 3.65). The distribution changed without the median changing — more plans at the top, without meaningful improvement in the middle. About 40% of contracts are at 4+ stars.

Devoted Health leads among national carriers at 5-star: Three Devoted Health contracts earned 5 stars for 2026. For a company that's been around less than a decade, this is extraordinary. Their model — smaller scale, more personalized, concierge navigation — appears to produce genuinely better member outcomes on the measures CMS tracks.

Alignment Healthcare, 100% at 4+ stars: Alignment Healthcare had 100% of its contracts at 4+ stars and earned two 5-star ratings. Alignment operates primarily in California and Sun Belt markets. If you're in their service area, they're worth checking.

Kaiser maintains 100% at 4+ stars: Kaiser Permanente continued its streak of 100% plan performance at 4 stars or above, with most plans at 4 or 4.5 stars. In California and D.C., Kaiser's HMO plans tied for the highest ratings in the market. This is the most consistent quality story in the industry.

Aetna leads large national carriers: CVS Health's Aetna has over 81% of MA members in 4+ star plans and over 63% in 4.5-star plans — the best numbers among the big national carriers. Aetna's scale and quality investment appear to be paying off in measurable outcomes.

UnitedHealthcare holds at 78%: UHC maintains 78% of members in 4+ star plans, 40% in 4.5-star plans. Solid for a plan of UHC's size but trailing Aetna's concentration.

Elevance (Anthem) improving: Elevance has 55% of members in 4+ star plans, up from 40% a year ago. Significant improvement, suggesting their quality investments are working.

Humana mixed: Humana's ratings vary by contract. Some are strong; others are below the 4-star threshold. This is a function of their geographic footprint — strong in some markets, weaker in others. Their pullback from 194 counties may be partly a strategic decision to exit markets where their star ratings weren't competitive.

CMS doesn't keep the star rating methodology static. They update measures, add new ones, retire others, and adjust weightings. Some of the notable changes going into 2026:

Enhanced patient experience weighting: CMS has continued shifting weight toward CAHPS survey measures — what members actually report about their experience. This is good. It reduces the ability of plans to game quality scores through purely administrative compliance while letting member experience deteriorate.

Health equity adjustments: CMS introduced health equity adjustments to the bonus payment calculation. Plans that enroll and care for socioeconomically disadvantaged populations may receive adjusted ratings that account for the additional challenges of serving these populations. The intent is to prevent plans from gaming ratings by cherry-picking healthier, wealthier enrollees.

Cut point changes: The thresholds that separate star levels shift annually based on the distribution of plan performance. This means a plan that scored exactly at the 4-star threshold last year might find itself at 3.5 stars in 2026 even with identical performance — because the rest of the industry performed better, raising the bar. This is partly responsible for the year-to-year volatility in star ratings.

Prior authorization measures: CMS has added and strengthened measures related to prior authorization timeliness and accuracy. Plans that deny too many prior auth requests, take too long to respond, or have high overturn rates on appeals are dinged on these measures. This is a direct response to documented abuse of prior authorization in the MA industry.

A significant methodology change is coming for 2027 and beyond — CMS has signaled intent to revamp the measurement system more substantially, potentially consolidating measures and shifting further toward outcomes-based evaluation. Plans are aware this is coming, which may be influencing investment decisions in quality infrastructure.

Here's the chain of causation: Star rating → bonus payment → benefit budget → what the plan offers you.

A plan at 3.5 stars gets no bonus. Working with tighter margins, it has fewer options. Some of that revenue shortfall ends up transferred to members through higher cost-sharing, fewer benefits, or tighter prior authorization.

This is why star rating is a reasonable proxy for plan quality even for beneficiaries who don't care about the methodology details. The financial incentive structure means higher-rated plans genuinely tend to offer better value.

One important nuance: star ratings are assigned at the contract level, not the individual plan level. A single carrier contract might include multiple plans (an HMO and an HMO-POS, for example). All plans under that contract share the contract's star rating. So a plan that seems comparable to another might have different star ratings because they're filed under different contracts.

Eighteen contracts earned 5 stars for 2026, available in 14 states and Puerto Rico. The carriers with 5-star contracts include:

Devoted Health: Three 5-star contracts, available across select markets in states where Devoted operates. This is the highest single-carrier count among carriers with 5-star plans in 2026.

Alignment Healthcare: Two 5-star contracts, primarily in California and Sun Belt markets.

Kaiser Permanente: Several Kaiser contracts in California, Colorado, and other Kaiser markets are at or near 5-star. The exact 5-star count varies — Kaiser's consistent 4–4.5 star performance sometimes tips to 5 in specific regions.

Various regional and local carriers: A number of smaller regional plans earned 5 stars in specific state markets. These vary year to year and are often local insurers without national brand recognition — Blue Shield of California, Zing Health, and others depending on the year.

The 5-star special enrollment period means: if any of these plans is available in your county and your current plan is underperforming, you can switch any time from December 8 through November 30 of the 2026 plan year. You don't need to wait for fall enrollment.

To check what 5-star plans are available in your zip code: Medicare.gov's Plan Finder lets you filter by star rating. Set the minimum to 5 stars and enter your location. If none show up, 5-star plans aren't available in your area for 2026.

I want to be honest about the limitations of the star rating system, because relying on it exclusively will lead you wrong sometimes.

Star ratings are backward-looking. The 2026 star ratings reflect performance measured during 2024–2025. A plan that had great outcomes two years ago may have changed — new management, network cuts, benefit reductions for 2026. The star rating gives you a quality trajectory, not a current snapshot.

Star ratings are average performance across the entire contract. A contract with 300,000 enrollees has members with wildly different experiences. The average 4.5-star rating might be driven by excellent chronic disease management in urban areas masking mediocre performance in rural counties on the same contract.

Star ratings don't measure network breadth or provider availability. A plan can score 4.5 stars on the quality measures CMS tracks and still have a network where you can't get a specialist appointment for 3 months.

Star ratings don't directly measure what matters to you specifically. If you take 12 medications and the relevant measure is adherence to 3 specific drug classes, the star rating might tell you nothing about how your specific drug regimen is covered.

Star ratings can be gamed. Plans have learned what measures drive stars and have optimized for them. HEDIS-targeted interventions, CAHPS survey outreach campaigns, and coding optimization can all improve star ratings without necessarily improving actual member experience. CMS is aware of this and keeps adjusting the methodology in response.

Use star ratings as a screening tool, not the final word. Four-star minimum as a filter is reasonable. Within the 4+ star universe, use plan-specific information — your doctors, your drugs, the MOOP, the specific benefits — to make the final call.

Practical application:

Use Medicare.gov Plan Finder and filter for 4+ stars as a starting point. This immediately reduces your comparison set to plans that have demonstrated quality performance on CMS measures.

If a 5-star plan is available in your area, use the 5-star SEP to keep your options open year-round — not just during AEP.

When comparing two plans with similar stars, go deeper: look at which specific measures one outperforms the other on. If you have diabetes, a plan that scores particularly high on diabetes management measures may be worth prioritizing over a plan with a slightly higher overall rating but mediocre chronic disease management.

Watch for year-over-year changes. A plan that dropped from 4.5 to 3.5 stars is telling you something about trajectory. Plans don't usually fall that far without operational problems. Conversely, a plan rising from 3 to 4 stars over two years suggests an insurer investing in quality — often a good signal.

Ask your State Health Insurance Assistance Program (SHIP) counselor about local plan performance. SHIP counselors are funded by CMS to provide free, unbiased Medicare counseling. They often have on-the-ground knowledge about which local plans perform well for specific populations that isn't captured in the aggregate star rating.

Look at the CMS plan contract performance data, which is more detailed than the star rating alone. CMS publishes individual measure scores for every contract — you can see exactly where a plan excels and where it underperforms. If you're serious about this research, the CMS Medicare Advantage Plan Performance data downloads are freely available.