Routing seniors into HMOs: Medicare is losing ground.
D000368:Aged; D006279:Health Maintenance Organizations / Q000706:statistics & numerical data*; D006299:Health Services for the Aged / Q000458:organization & administration*; D006801:Humans; D006278:Medicare / Q000458:organization & administration*; D012051:Reimbursement Mechanisms / Q000331:legislation & jurisprudence; D014481:United States