Medicare Supplement insurance does not cover prescription drugs you pick up at a pharmacy. Every standard Medigap plan sold since January 1, 2006 excludes outpatient prescription coverage by federal law.1Centers for Medicare & Medicaid Services. Announcement Deductible Amount for Medigap High Deductible Options for Calendar Year 2006 Medigap does help pay for drugs a doctor or nurse administers in a clinical setting, because those are billed under Medicare Part B. For anything you fill at the pharmacy counter and take at home, you need a separate Medicare Part D plan or a Medicare Advantage plan that includes drug benefits.2Medicare. Learn What Medigap Covers
What Medigap Does Pay Toward Medications
The pharmacy exclusion is narrow. Drugs administered in a doctor’s office, hospital outpatient department, or infusion center are billed under Part B, not Part D. Chemotherapy infusions, injectable biologics for autoimmune conditions, dialysis drugs, and certain vaccines fall into this group. So do medications used with durable medical equipment, like nebulizer solutions.3Centers for Medicare & Medicaid Services. Part B Drugs
Under Original Medicare, you owe 20% coinsurance on Part B drugs after meeting the annual Part B deductible, which is $283 in 2026.4Medicare.gov. Prescription Drugs (Outpatient)5Centers for Medicare & Medicaid Services. 2026 Medicare Parts A and B Premiums and Deductibles On expensive treatments, that share is painful. A $10,000 chemotherapy session leaves you with a $2,000 coinsurance bill. Medigap pays that coinsurance for you. For anyone receiving ongoing infusions or injections, this is the part of a Medigap policy that does the heavy lifting.
Why Pharmacy Drugs Are Excluded
Before 2006, a handful of Medigap plans offered limited drug benefits. The Medicare Modernization Act of 2003 created Part D and barred insurers from selling new Medigap policies with any drug coverage after December 31, 2005.1Centers for Medicare & Medicaid Services. Announcement Deductible Amount for Medigap High Deductible Options for Calendar Year 2006 Part D was built to handle outpatient drugs; Medigap kept its original role of covering cost-sharing gaps in Part A and Part B. Your Medigap card will not work at a retail pharmacy, and assuming otherwise leads to surprise bills.
Grandfathered Plans H, I, and J
A small number of people still hold legacy Plan H, I, or J policies bought before the cutoff. Those plans were allowed to include limited drug coverage, and if you’ve kept one continuously since the original purchase date and never enrolled in Part D, you can keep the benefit under grandfathered status.1Centers for Medicare & Medicaid Services. Announcement Deductible Amount for Medigap High Deductible Options for Calendar Year 2006 Premiums on these plans have climbed, partly because the pool keeps shrinking and no new enrollees can join. Drop the policy and you cannot get it back. If you hold one, the honest comparison is whether its drug benefit beats what a modern lettered Medigap plan plus a standalone Part D plan would cost.
How to Actually Get Pharmacy Coverage: Part D
Most people with Original Medicare and a Medigap policy add a standalone Part D plan. Part D is sold by private insurers, carries its own monthly premium, and sits alongside your Medigap coverage.6Medicare. Learn How Medigap Works
Each plan maintains a formulary, the list of drugs it covers. Formularies organize medications into tiers that set your cost-sharing at the pharmacy. Generics sit on lower tiers with the smallest copayments; brand-name and specialty drugs land on higher tiers with larger ones.7Medicare. How Do Drug Plans Work Before choosing a plan, check that your specific medications appear on the formulary and see which tier they fall into. Two plans with the same premium can produce very different pharmacy bills.
Part D Costs in 2026
- Monthly premium. The national base beneficiary premium for 2026 is $38.99. Your actual premium depends on the plan you choose, and higher-income beneficiaries pay an income-related surcharge on top.8Centers for Medicare & Medicaid Services. 2026 Medicare Part D Bid Information and Part D Premium Stabilization Demonstration Parameters
- Annual deductible. No plan can charge more than $615 in 2026. Many set the deductible lower or waive it for certain tiers.9Medicare. How Much Does Medicare Drug Coverage Cost
- Copayments and coinsurance. After the deductible, you pay a copay or percentage for each prescription based on its formulary tier.
- Annual out-of-pocket cap. Once your out-of-pocket drug spending reaches $2,100 in 2026, you pay nothing more for covered Part D drugs for the rest of the year. Premiums don’t count toward the cap.10Centers for Medicare & Medicaid Services. Draft CY 2026 Part D Redesign Program Instructions Fact Sheet
The out-of-pocket cap is new. It began at $2,000 in 2025 and adjusts upward with drug cost growth. Before the cap existed, people on expensive specialty medications could spend thousands each year with no ceiling.
The Part D Late Enrollment Penalty
Skipping Part D at 65 because you feel healthy is where this gets expensive. If you go 63 or more consecutive days without creditable drug coverage after becoming eligible, Medicare adds a permanent penalty to your Part D premium when you eventually enroll.11Medicare. Avoid Late Enrollment Penalties Creditable coverage means a drug plan, through an employer, union, or TRICARE for example, that pays at least as much as standard Part D on average.12Centers for Medicare & Medicaid Services. Creditable Coverage
The penalty is 1% of the national base beneficiary premium for every month you went without coverage. In 2026, that works out to roughly $0.39 per uncovered month. Someone who delayed 24 months would pay about $9.36 extra per month on top of their regular premium, for life. The penalty recalculates each year as the base premium shifts, but it never ends.13Centers for Medicare & Medicaid Services. Information Partners Can Use on the Part D Late Enrollment Penalty A diagnosis five years into retirement means enrolling with a 60-month penalty baked into every premium going forward.
Extra Help for Lower-Income Beneficiaries
If Part D premiums and copays feel out of reach, the Extra Help program (the Low-Income Subsidy) sharply reduces drug costs. In 2026, individuals with income below $23,940 and resources below $18,090 can qualify. For couples, the limits are $32,460 in income and $36,100 in resources.14Medicare. Help With Drug Costs
Under Extra Help, you pay no Part D premium, no deductible, and no more than $5.10 per generic or $12.65 per brand-name prescription. Once your total drug costs reach $2,100 for the year, your copays drop to $0. Extra Help also waives the late enrollment penalty entirely.14Medicare. Help With Drug Costs Social Security handles the application and can tell you whether you qualify.
Medicare Advantage as the Other Route
Medicare Advantage takes a different approach. One private plan bundles hospital, medical, and usually drug coverage, often with a low or $0 premium beyond the standard Part B premium. The tradeoff: federal law does not let you hold a Medigap policy and a Medicare Advantage plan at the same time.6Medicare. Learn How Medigap Works Advantage plans use networks, often require referrals, and set their own deductibles and copays. If you want to keep Medigap, Part D is your drug-coverage path. If you want everything on one card, Medicare Advantage with built-in drug coverage is the alternative, and Medigap is off the table.