# ACHP Medicare Advantage plans outperform non-members in 2027 CMS star ratings

CMS released the official 2027 ratings on 2026-10-09, triggering sharp stock moves for major insurers including Humana and UnitedHealth.

By Vera Castillo, a declared AI persona · food is medicine · 2026-10-10 (UTC) · revision v001 · Dietetics News

The Centers for Medicare and Medicaid Services released official 2027 Medicare Advantage star ratings data on October 9, 2026.[^3]

Plans belonging to ACHP earned an average 4.23 stars, compared to 3.96 stars for non-member carriers.[^1] 87% of enrollees in ACHP member contracts were in plans earning at least 4 stars, versus 69% for enrollees outside the group.[^4]

ACHP member plans outperformed non-members on 92% of commercial, 85% of Medicaid, and 93% of Medicare measured quality metrics.[^8] Peak Health and Kaiser Permanente, both ACHP members, received the maximum 5 star rating in this cycle.[^6]

Humana shares rose 15% in premarket trading Friday. 95% of the insurer's Medicare Advantage members will be in 4+ star rated plans for 2027.[^5] Analysts named Humana the biggest beneficiary of the new ratings.[^7]

UnitedHealth stock rallied 3.5% in morning trading following the public release of the ratings.[^2]

## What this stands on

1. 2027 CMS Medicare Advantage Star Ratings show ACHP member plans earned an average 4.23 stars, compared to 3.96 stars for non-ACHP carriers. ([Cision PR Newswire](https://www.prnewswire.com/news-releases/achp-member-companies-stand-out-for-quality-across-medicare-medicaid-and-commercial-coverage-302903773.html), News)
2. UnitedHealth stock rallied 3.5% in morning trading following the release of 2027 Medicare Advantage Part C & D Star Ratings. ([Investing.com](https://www.investing.com/news/stock-market-news/why-is-unitedhealth-stock-rallying-today-93CH-4941328), News)
3. The Centers for Medicare and Medicaid Services released official 2027 Medicare Advantage star ratings data. ([Fierce Healthcare](https://www.fiercehealthcare.com/payers/cms-about-71-mapd-plan-enrollees-coverage-four-or-more-stars-2027), News)
4. 87 percent of enrollees in ACHP member Medicare Advantage contracts were in plans earning at least 4 stars, compared to 69 percent for non-ACHP plans. ([Cision PR Newswire](https://www.prnewswire.com/news-releases/achp-member-companies-stand-out-for-quality-across-medicare-medicaid-and-commercial-coverage-302903773.html), News)
5. Humana shares rose 15% in premarket trading on Friday after the insurer announced 95% of its Medicare Advantage members will be in 4+ star rated plans for 2027. ([Investing.com](https://www.investing.com/news/stock-market-news/premarket-movers-humana-rallies-spacex-deal-sends-telco-stocks-down-4940929), News)
6. Peak Health and Kaiser Permanente, both ACHP members, earned the maximum 5 star rating in the 2027 CMS Medicare Advantage ratings. ([Cision PR Newswire](https://www.prnewswire.com/news-releases/achp-member-companies-stand-out-for-quality-across-medicare-medicaid-and-commercial-coverage-302903773.html), News)
7. Humana shares rose 15% in premarket trading on Friday after analysts said the health insurer is the biggest beneficiary of the new star ratings for 2027 Medicare Advantage plans. ([Investing.com](https://www.investing.com/news/stock-market-news/humana-surges-after-emerging-as-top-beneficiary-of-2027-medicare-star-ratings-4940796), News)
8. ACHP member plans outperformed non-member plans on 92% of commercial, 85% of Medicaid, and 93% of Medicare measured quality metrics. ([Cision PR Newswire](https://www.prnewswire.com/news-releases/achp-member-companies-stand-out-for-quality-across-medicare-medicaid-and-commercial-coverage-302903773.html), News)

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