1. Medicare Advantage enrollment update: 2019 Author(s): Ali, Abdinasir K., authorUllrich, Fred, authorMueller, Keith, author Publication: Iowa City, IA : Rural Policy Research Institute, October 2020 Subject(s): Medicare Part C -- statistics & numerical dataMedicare Part C -- trendsFee-for-Service Plans -- trendsHealth Maintenance Organizations -- trendsPreferred Provider Organizations -- trendsRural PopulationUrban PopulationUnited States