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Medicare Part D – Prescription Drug Coverage

Medicare Part D helps beneficiaries pay for prescription medications. It’s offered through private insurance companies approved by Medicare, either as:

  • A standalone plan added to Original Medicare (Parts A & B).
  • Included within a Medicare Advantage plan (Part C) that bundles medical and drug coverage.

  • Generally covers both brand-name and generic medications.
  • Each plan has a list of covered drugs organized into tiers (generic, preferred brand, specialty, etc.).
  • Plans often have preferred pharmacies where costs are lower.
  • Many plans allow 90-day supplies delivered to your home.

Coverage varies by plan, so it’s essential to check whether your medications are covered.


  • Monthly costs vary by plan and income (higher-income beneficiaries may pay an IRMAA surcharge).
  • Some plans require you to pay a set amount before coverage begins (up to $615 in 2026).
  • What you pay for each prescription, depending on the drug tier.
  • Once out-of-pocket costs reach a high threshold, your costs drop significantly for the rest of the year.

  • Eligibility: You must be enrolled in Medicare Part A and/or Part B, reside in the plan’s service area, and be a U.S. citizen or a lawfully present resident to purchase a Part D prescription drug plan.
  • Enrollment: You can enroll during your Initial Enrollment Period (IEP) or the Annual Enrollment Period (AEP) from Oct 15 – Dec 7. You can also enroll if you qualify for a Special Enrollment Period (SEP).
  • Late Enrollment Penalty: If you go 63+ days without Part D or other creditable drug coverage, you’ll pay a permanent penalty added to your monthly premium.

Example:
If you go 20 months without coverage, your penalty is 20% of the national base premium added permanently.


  • Protects against high drug costs.
  • Ensures access to needed medications.
  • Provides flexibility with multiple plan options tailored to your prescriptions and pharmacy preferences.

Medicare Part D is your prescription drug coverage. It’s essential for anyone taking medications, and choosing the right plan requires balancing premiums, deductibles, copays, and formulary coverage. Enrolling on time avoids penalties and ensures affordable access to prescriptions.