Health Affairs October 1, 2025
Abstract
Medicare Advantage (MA) enrollment has grown rapidly over recent years, and enrollees may now choose from among a large number of MA plans. However, the market remains highly concentrated, with a few very large insurers. Using MA administrative data, we analyzed trends in insurer concentration during the period 2013–23 and its relation to MA payments and plan characteristics. We documented a significant shift toward less concentration, but concentration remained high. The average number of insurers per county increased, and the Herfindahl-Hirschman Index...
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