1. Doors to extra help: boosting enrollment in the Medicare Part D low-income subsidy Publication: Washington, D.C. : AARP Public Policy Institute, c2007 Subject(s): Medicare Part DInsurance, Pharmaceutical ServicesCommunity-Institutional RelationsEligibility DeterminationHealth Services AccessibilityCommunication BarriersFederal GovernmentMedicaidPovertySocial SecurityState GovernmentHumansUnited States