Does Medigap Cover Prescription Drugs? 2026 Guide

Table of Contents

• Does Medigap Cover Prescription Drugs?
• What Medigap Is and How It Works with Original Medicare
• What Medigap Does and Does Not Cover
• Medicare Part D with Medigap: Getting Prescription Drug Coverage
  • Step-by-step: enrolling in Part D after choosing Medigap
  • How to compare Part D plans for your specific medications
  • Enrollment timing and late-enrollment penalties
  • Drugs covered under Part B, not Part D
  • Help with Part D costs
• Medigap Plans That Cover Prescriptions: The Historical Exception
  • Is your old Medigap drug benefit 'creditable coverage'?
  • What happens if you switch
  • A practical way to decide
• Medigap vs Medicare Advantage Prescription Coverage
• Enrollment Timing and Late-Enrollment Penalties
• Conclusion
• Frequently Asked Questions

Last Updated: October 6, 2026

Does Medigap Cover Prescription Drugs?

Does Medigap cover prescription drugs? No. Most Medigap policies sold today exclude prescription drug coverage, so if you have Original Medicare with a Medigap supplement, you'll need a separate Medicare Part D plan for your medications.

Many people turning 65 assume their Medigap policy handles everything. It doesn't. We explain exactly what Medigap does and doesn't pay for.

What Medigap Is and How It Works with Original Medicare

A Medigap policy pays some or all of those out-of-pocket costs while you keep Original Medicare as your base coverage.

Medigap works alongside Original Medicare, not Medicare Advantage. You cannot use Medigap with a Medicare Advantage plan.

Medigap policies are standardized by the federal government: Plan A from one insurer covers the same benefits as Plan A from another (Medigap (Medicare Supplement Health Insurance)).

What Medigap Does and Does Not Cover

Medigap helps with costs Original Medicare doesn't pay:

• Hospital deductibles and coinsurance
• Doctor visit copayments
• Blood transfusion costs

What Medigap does NOT cover includes:

• Prescription drugs
• Dental care
• Vision care

The prescription drug gap is the biggest one for most seniors: Original Medicare doesn't cover outpatient prescriptions, and Medigap doesn't fill that gap. You need Part D.

Medicare Part D with Medigap: Getting Prescription Drug Coverage

If you choose Medigap, you must enroll in Medicare Part D separately for prescription coverage. Part D is optional, but skipping it without other creditable drug coverage triggers a late-enrollment penalty later.

How Part D works: You choose a plan from a private insurer. It covers outpatient prescriptions from participating pharmacies, with its own formulary, tier structure, and pharmacy network.

Part D plans include:

• Monthly premiums (varies by plan and region)
• Annual deductibles (if the plan includes one)
• Copayments or coinsurance for each prescription, usually tiered (generic, preferred brand, non-preferred brand, specialty)

Enrolling in Medigap does not auto-enroll you in Part D; you must actively choose a plan during your enrollment period.

Step-by-step: enrolling in Part D after choosing Medigap

Here is the actual enrollment sequence:

1. Confirm your enrollment window. Your Part D Initial Enrollment Period (IEP) is the same seven-month window as Part B: the three months before, the month of, and the three months after you turn 65. If an employer plan qualifies as creditable coverage, you may delay Part D without penalty, but confirm that in writing.
2. Gather your medication list. Write down every prescription, exact dosage, and fill frequency, the most important input for choosing a plan.
3. Use the Medicare Plan Finder. On Medicare.gov, enter your ZIP code, drugs, and preferred pharmacies to see each plan's estimated annual cost for your list, not just the premium.
4. Compare total annual cost, not premium. A $0-premium plan can cost more across a year than a modest-premium plan if its formulary puts your drugs on a high tier or excludes them.
5. Check the pharmacy network. A plan may cover your drug only at certain pharmacies, or charge more at one you don't use.
6. Enroll directly with the plan. Enroll online through Medicare.gov, by phone, or by paper application; coverage generally starts the first day of the month after you enroll.
7. Re-shop every fall. Formularies and premiums change annually; the Annual Enrollment Period (October 15 - December 7) lets you switch Part D plans without underwriting.

How to compare Part D plans for your specific medications

A plan that looks cheap on premium can be expensive at the counter. Compare these four numbers for each drug:

• Tier placement, which tier the plan assigns to each drug
• Cost-sharing, the copay or coinsurance for that tier
• Prior authorization or step therapy, whether the plan requires extra approvals before it will cover the drug

Two plans with identical premiums can differ by hundreds of dollars a year for the same drug list, purely because of tier placement and pharmacy network, which is why the Plan Finder's estimated annual cost matters more than the advertised premium.

Enrollment timing and late-enrollment penalties

Enrollment timing matters. Miss the Part D window without creditable coverage and you'll pay a permanent penalty of 1% of the national average Part D premium per month for every month you went without coverage.

The Part D IEP runs three months before, during, and after the month you turn 65. Miss it and you can only enroll during the Annual Enrollment Period (October 15 - December 7) or a Special Enrollment Period.

Drugs covered under Part B, not Part D

Not every drug is a Part D drug. Drugs administered in a medical setting, infusions, doctor's-office injections, and certain hospital outpatient drugs, are generally covered under Part B, not Part D. Part B drugs run through Original Medicare (and may be affected by your Medigap plan), while retail pharmacy prescriptions run through Part D. If unsure, ask your prescriber's office before you fill it.

Help with Part D costs

If Part D costs strain your budget, several programs can help:

• Extra Help (Low-Income Subsidy), a federal program that helps pay Part D premiums, deductibles, and copays for people with limited income and resources. Apply through the Social Security Administration.
• State Pharmaceutical Assistance Programs (SPAPs), many states run their own programs to help residents with drug costs. Check your state's program through Medicare.gov.
• Manufacturer patient assistance programs, many drugmakers offer direct help for specific medications.

These can be layered on top of a Part D plan, so check eligibility before assuming a plan is unaffordable.

Medigap Plans That Cover Prescriptions: The Historical Exception

Before January 1, 2006, some Medigap policies included prescription drug coverage. These older plans, often Plan H, Plan I, or Plan J, are no longer sold to new enrollees, but existing coverage continues as long as you pay the premium.

If you own a Medigap policy sold before January 1, 2006 that includes drug benefits, you have a choice:

• Keep your current plan and its drug coverage
• Switch to a new Medigap plan (which won't include drugs) and enroll in Part D
• Keep your old plan and also enroll in Part D for additional coverage

Many people hold onto these older plans specifically for the drug benefit, since switching to a newer Medigap plan means losing that built-in coverage.

Is your old Medigap drug benefit 'creditable coverage'?

This determines whether you can delay Part D without a penalty.

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You can delay Part D without a late-enrollment penalty only with creditable prescription drug coverage, coverage expected to pay, on average, at least as much as standard Part D.

Your Medigap insurer must tell you each year whether your drug coverage is creditable, usually via a fall notice. If you can't find it, call the insurer for written confirmation.

• If the notice says creditable: you can generally keep the old plan and delay Part D without a penalty, as long as the coverage remains creditable.
• If the notice says non-creditable: you should enroll in Part D during your enrollment window. Delaying Part D while holding non-creditable coverage exposes you to the 1%-per-month late-enrollment penalty.

What happens if you switch

Drop the old Medigap plan and you lose the built-in drug benefit, so you'll need Part D, and timing matters. Enroll within the allowed window after losing creditable coverage to avoid a penalty; let the window lapse and the penalty applies.

Also, switching Medigap plans outside your initial enrollment window may require medical underwriting in most states, so an insurer can charge more or decline you based on health history.

A practical way to decide

Run the numbers both ways each fall:

1. Add up what you pay now: the old Medigap premium plus your out-of-pocket drug costs under its benefit.
2. Estimate what you'd pay if you switched: a new Medigap premium (which may be higher due to underwriting) plus a Part D premium plus your Part D copays for the same drug list.
3. Compare the totals, factoring in the risk that the old plan's drug benefit could be reduced or its creditable status could change.

If the totals are close, modern Medigap plus Part D is often more durable, since Part D plans can be re-shopped every year while an old Medigap drug benefit cannot.

Medigap vs Medicare Advantage Prescription Coverage

Medigap and Medicare Advantage are fundamentally different paths, and prescription coverage is one major difference.

Medigap with Original Medicare requires you to add Part D separately for prescription coverage.

Which is better depends on your situation:

Medicare Advantage often bundles prescription coverage, simplifying enrollment, one plan, everything included, but your drug formulary is locked into that plan's choices.

With Medigap and Part D, you choose your Medigap plan based on medical costs and your Part D plan based on your medications.

Enrollment Timing and Late-Enrollment Penalties

Getting the timing right protects you from penalties and coverage gaps:

Initial Enrollment Period (IEP): Your first eligibility window, running three months before, during, and after the month you turn 65. If eligible due to disability or End-Stage Renal Disease (ESRD), your IEP starts three months before coverage begins.

During your IEP, you can enroll in Medigap and Part D without waiting periods or medical underwriting (with limited exceptions).

Special Enrollment Period (SEP): Losing employer-sponsored coverage, commonly through retirement, may qualify you for extra time to enroll without penalties.

Annual Enrollment Period (AEP): October 15 - December 7 each year, you can enroll in, switch, or drop Medicare Advantage, Part D, or Medigap plans, effective January 1.

Late-enrollment penalties: Miss your IEP or SEP and you'll face:

• Part D penalty: 1% of the national average Part D premium per month, permanently added to your premium
• Medigap penalty: Some states allow insurers to charge higher premiums if you enroll outside your IEP

These penalties stick for life, so correct timing saves money for years.

Conclusion

Does Medigap cover prescription drugs? No, but that's just the starting point. Original Medicare with a Medigap supplement gives flexibility and predictable costs, but requires you to actively enroll in Medicare Part D for prescription coverage.

We break down exactly what each plan covers and when you need to act. Whether you're approaching 65, losing employer coverage, or switching plans during the Annual Enrollment Period, we provide clear guidance on avoiding coverage gaps and enrollment penalties.