1. Medicare Advantage enrollment update 2020 Author(s): Baten, Redwan Bin Abdul, authorUllrich, Fred, authorMueller, Keith, author Publication: Iowa City, IA : Rural Policy Research Institute, May 2021 Subject(s): Medicare Part C -- statistics & numerical dataMedicare Part C -- trendsFee-for-Service Plans -- trendsHealth Maintenance Organizations -- trendsPreferred Provider Organizations -- trendsRural PopulationUrban PopulationUnited States