Medicare Advantage enrollment has grown rapidly over the past decade, and Medicare Advantage plans have taken on a larger role in the Medicare program. More than 24 million Medicare beneficiaries (36%) are enrolled in Medicare Advantage plans in 2020. This data analysis provides updated information about Medicare Advantage enrollment trends, premiums, and out-of-pocket limits. It also includes analyses of Medicare Advantage plans’ extra benefits and prior authorization requirements. The analysis also highlights changes pertaining to Medicare Advantage coverage that have occurred in 2020 in response to the COVID-19 crisis.