1. Improving the Medicare Part D program for the most vulnerable beneficiaries Publication: New York, NY : Commonwealth Fund, [2007] Subject(s): Frail ElderlyInsurance, Pharmaceutical ServicesMedicareVulnerable PopulationsAgedAged, 80 and overDrug Prescriptions -- economicsEligibility DeterminationFormularies as TopicHealth Services AccessibilityLong-Term CareMedicaidPovertyProgram EvaluationQuality Indicators, Health CareUnited States