1. Medicare advantage: CMS should use data on disenrollment and beneficiary health status to strengthen oversight : report to Congressional Requesters Publication: Washington, D.C. : U.S. Government Accountability Office, April 2017 Subject(s): Health StatusInsurance Selection BiasMedicare Part C -- statistics & numerical dataGovernment RegulationRiskHumansUnited StatesUnited States. Department of Health and Human Services.Centers for Medicare & Medicaid Services (U.S.)