Home/Glossary/Low-Income Subsidy (Extra Help)Glossary · Part DLow-Income Subsidy (Extra Help)A federal program that helps pay Part D premiums, deductibles, and copays for enrollees with limited income and resources.Related TermsFormularyDrug TierStep TherapyDonut HoleCatastrophic CoverageCreditable CoverageFormulary ExceptionMedication Therapy Management (MTM)← Back to glossary index