Medicare Advantage in 2021: Enrollment Update and Key Trends

Medicare Advantage enrollment has steadily increased both nationally and within most states since 2005, with more than 40 percent of Medicare beneficiaries enrolled in Medicare Advantage plans in 2021. The share of Medicare Advantage enrollees varies across the country: in 26 states and Puerto Rico, at least 40 percent of Medicare beneficiaries are enrolled in Medicare Advantage plans in 2021, and at least 50 percent in Florida, Minnesota and Puerto Rico. In a growing number of counties, more than half of all Medicare beneficiaries are in a Medicare Advantage plan, in lieu of traditional Medicare. Enrollment continues to be highly concentrated among a handful of firms, both nationally and in local markets, with UnitedHealthcare and Humana together accounting for 45 percent of enrollment in 2021.