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Part D Prescription Coverage

Formularies, tiers, the yearly out-of-pocket cap and the late-enrollment penalty — how Part D drug plans work and how to compare them on your own medications.

Part D is Medicare's prescription drug benefit, delivered only through private plans — either a standalone drug plan beside Original Medicare or built into a Medicare Advantage plan. Each plan keeps its own list of covered drugs, its own tiers and its own pharmacies, and each list changes every January.

Two people on the same plan can pay very different amounts because they take different drugs. The only comparison that matters is the one run on your own prescriptions. The guides below show you how, and what the penalty is for going without coverage.

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Part D Prescription

Medicare Part D: Your Prescription Drug Coverage Choices

Understand Medicare Part D: prescription drug coverage, costs, and enrollment periods. Compare plans, manage expenses, and find the right drug plan for your needs in 2026.

Part D Prescription

Medicare Part D: Avoiding Late Enrollment Penalties

Learn about the Medicare Part D late enrollment penalty, how it's calculated, the importance of creditable drug coverage, and how Medicare Advantage plans impact your drug coverage choices.

Part D Prescription

Medicare Part B or Part D: Which Pays for Your Drugs?

Understand whether Medicare Part B or Part D covers your prescription drugs, including infusions, insulin, and vaccines. Learn about cost-sharing and plan differences.

Part D Prescription

Managing High Drug Costs: The Medicare Prescription Payment Plan

Learn about the Medicare Prescription Payment Plan, a new option to spread your Part D prescription drug costs over monthly payments and avoid large upfront bills.