Enrollment in Medicare Advantage (MA) plans, measured
either as an overall count or as a proportion of eligible
Medicare beneficiaries continues to climb with one in
three Medicare beneficiaries enrolled in an MA plan in
March 2017. Among non-metropolitan enrollees, nearly one
in four (23.5%) beneficiaries is enrolled in an MA plan.
The majority of all MA enrollees are in Health
Maintenance Organization (HMO) plans but that is largely
driven by metropolitan enrollees. The majority of
non-metropolitan MA enrollees are in preferred provider
organization (PPO) plans, either local PPOs (38.5%) or
regional PPOs (17.7%).