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Does Medicare cover prescription drugs?

Not under Parts A and B in the way you would expect. Drug coverage is its own decision, and skipping it has a permanent cost.

Updated August 17, 2026 · 3 min read

Original Medicare covers almost nothing you pick up at a pharmacy counter. Prescription coverage is a separate piece you have to add, and choosing not to add it carries a penalty that never goes away.

What Parts A and B do cover

• Drugs given to you while admitted as a hospital inpatient, under Part A
• Drugs administered in a clinic that you could not give yourself, under Part B, such as infusions and most chemotherapy
• A small set of specific medications under Part B, including some immunosuppressants after a covered transplant and certain injectables

That is the whole list. Everything you fill at the pharmacy falls outside it.

Two ways to get drug coverage

• A standalone Part D plan, which you add alongside Original Medicare and usually a Medigap policy
• A Medicare Advantage plan that includes drug coverage built in, which most of them do

You pick one or the other. Joining a standalone Part D plan while enrolled in a drug inclusive Advantage plan will typically get you disenrolled from the Advantage plan, which is rarely what anyone intends.

The part that costs people money

Every drug plan has its own formulary, meaning its own list of covered medications sorted into tiers. Two plans with the same monthly premium can price your specific prescription completely differently.

If you take no medications

This is the most common reason people skip Part D, and it is usually the wrong call.

The late enrollment penalty accrues for every month you go without creditable drug coverage, whether or not you needed any. It is roughly 1 percent of a national base premium per month, and it stays attached for as long as you have Part D.

A low cost plan now is nearly always cheaper than the surcharge later, and health changes faster than the arithmetic. See how the penalty works.

The out of pocket cap

There is now an annual limit on what you pay out of pocket for covered drugs under Part D. Once you reach it, your covered prescriptions cost you nothing for the rest of the year.

This replaced the old coverage gap that everyone knew as the donut hole. For anyone on expensive medication it changed the math entirely, and it is worth revisiting a decision you made under the old rules.

Coverage that counts instead

You are not penalized for time you had coverage at least as good as Part D. That includes:

• VA prescription benefits
• TRICARE
• Most employer and union drug plans, which must send you a creditable coverage notice each year
• Some retiree drug plans

Keep those annual notices. They are what you produce if a penalty is applied by mistake.