
The share of Medicare beneficiaries enrolled in Medicare Advantage varies widely across counties.More than half (51%) of eligible Medicare beneficiaries are enrolled in Medicare Advantage in 2023.A second, companion analysis describes Medicare Advantage premiums, out-of-pocket limits, cost sharing, extra benefits offered, prior authorization requirements, and star ratings in 2023. To better understand trends in the growth of the program, this brief provides current information about Medicare Advantage enrollment, by plan type and firm, and shows how enrollment varies by state and county. The average Medicare beneficiary in 2023 has access to 43 Medicare Advantage plans, the largest number of options ever. In 2023, 30.8 million people are enrolled in a Medicare Advantage plan, accounting for more than half, or 51 percent, of the eligible Medicare population, and $454 billion (or 54%) of total federal Medicare spending (net of premiums). After a period of some instability in terms of plan participation and enrollment, The Medicare Modernization Act of 2003 created stronger financial incentives for plans to participate in the program throughout the country and renamed private Medicare plans Medicare Advantage. Medicare Advantage enrollment has been on a steady climb for the past two decades following changes in policy designed to encourage a robust role for private plan options in Medicare.
