Two new KFF analyses examine the latest data about Medicare Advantage, including trends in enrollment, premiums, out-of-pocket limits, supplemental benefits and prior authorization.
The first analysis, focusing on enrollment trends, finds that 54% of eligible Medicare beneficiaries are enrolled in Medicare Advantage in 2025, though increases in enrollment slowed this year. One in five Medicare Advantage enrollees is in a special needs plan (SNP), reflecting a steady increase in recent years. And Medicare Advantage enrollment remains highly concentrated among a handful of insurance companies.
The second analysis finds that more than three quarters (76%) of enrollees in individual Medicare Advantage plans with prescription drug coverage pay no premium other than the Medicare Part B premium. The share of enrollees in plans offering a rebate against the Part B premium rose sharply from 12% in 2024 to 32% in 2025, but among these enrollees, about half are in plans that offer rebates of less than $10 a month while fewer (36%) are in plans that offer rebates of $50 or more per month. Prior authorization is most often required for expensive services such as skilled nursing facility stays (99%), Part B drugs (98%), inpatient hospital stays (acute: 96%; psychiatric: 93%) and outpatient psychiatric services (80%).
