Associations Between Annual Medicare Part D Low-Income Subsidy Loss and Prescription Drug Spending and Use

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Abstract
The Medicare Part D prescription drug program provides premium and cost-sharing assistance for beneficiaries who qualify for the Low-Income Subsidy (LIS) program. In 2023, 13.4 million beneficiaries (27% of Medicare Part D enrollees) received full or partial LIS benefits.1 For beneficiaries receiving the full subsidy, the LIS provides complete assistance with Part D plan premiums and annual deductibles and reduces beneficiary cost-sharing after the deductible. Receiving this assistance is associated with reductions in cost-related treatment nonadherence and financial stress among beneficiaries with low incomes.2-5

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