Reentering M+COs forced to reenroll enrolled beneficiaries.
D000368:Aged; D014487:Centers for Medicare and Medicaid Services, U.S.; D006279:Health Maintenance Organizations / Q000706:statistics & numerical data*; D006801:Humans; D020398:Medicare Part C / Q000706:statistics & numerical data*; D009516:New Mexico; D014481:United States