Increased Weights, Cut Points Likely Led to Drop in 2021 Stars

Although more than three-quarters of Medicare Advantage beneficiaries remain in highly rated plans, the percentage of MA Prescription Drug (MA-PD) plan enrollees estimated to be in contracts receiving 4 or more stars in 2021 fell by approximately 4 percentage points from 2020. That overall takeaway from the Oct. 8 release of the 2021 star quality ratings was somewhat surprising, given that there were no new measures for 2021 and CMS used some of the same data to ease reporting burden during the pandemic, but a deeper look at the results reveals several factors at play, industry experts tell AIS Health.

According to the CMS Fact Sheet released alongside the stars data, approximately 49% of MA-PD plans (194 contracts) that will be offered in 2021 earned overall star ratings of 4 or higher, compared with 52% of MA-PDs (210 contracts) offered in 2020. Weighted by enrollment, roughly 77% of MA-PD members are currently in contracts that will have 4 or more stars in 2021, down from about 81% in 2020, estimated CMS. And the average MA-PD star rating weighted by enrollment fell from 4.16 in 2020 to 4.06 for 2021.

© 2025 MMIT
Lauren Flynn Kelly

Lauren Flynn Kelly Managing Editor, Radar on Medicare Advantage

Lauren has been covering health business issues since the early 2000s and specializes in in-depth reporting on Medicare Advantage, managed Medicaid and Medicare Part D. She also possesses a deep understanding of the complex world of pharmacy benefit management, having written AIS Health’s Radar on Drug Benefits from 2004 to 2005 and again from 2011 to 2016. In addition to her role as managing editor of Radar on Medicare Advantage, she oversees AIS Health’s publications and manages the health editorial staff. She graduated from Vassar College with a B.A. in English.

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