Does Medicare Pay for Medicine: Parts A, B, and D

Yes, Medicare does pay for medicine, but which part of the program pays, and how much comes out of your pocket, depends on where and how the drug is given to you. Inpatient drugs during a hospital or skilled nursing stay are billed under Part A. Drugs a clinician administers in an office or outpatient setting are billed under Part B. Prescriptions you pick up at a pharmacy or receive by mail order are billed under Part D. Beginning in 2026, a $2,100 annual ceiling on Part D out-of-pocket costs and newly negotiated prices on ten widely used drugs make the coverage more generous than it has been in years.¹

Drugs During a Hospital or Nursing Facility Stay

When you are formally admitted as an inpatient, every medication given to you during the stay is bundled into the hospital’s lump payment from Medicare. You won’t see a line item for each pill or injection. Federal regulations treat drugs, supplies, and equipment as included inpatient services.² What you owe is the Part A deductible, which is $1,736 per benefit period in 2026, rather than a per-drug charge.³

The same bundling covers medications during a skilled nursing facility stay after a qualifying hospital admission. Part A pays through day 100, but the cost-sharing shifts along the way. Days 1 through 20 cost you nothing beyond the deductible you already paid. Days 21 through 100 carry a daily coinsurance of $217 in 2026. After day 100, Medicare stops paying for the stay.⁴ The drugs covered are limited to what your recovery requires, not maintenance prescriptions for unrelated conditions.

Drugs a Clinician Administers

Part B pays for medications a healthcare provider gives you in a clinical setting when the drug is not designed to be self-administered. The common examples are chemotherapy infusions, injectable biologics, and drugs delivered through durable medical equipment like a nebulizer or infusion pump.⁵ Certain vaccines also sit here: flu, pneumonia, hepatitis B for people at elevated risk, and COVID-19. The distinguishing feature is that a medical professional delivers the drug rather than handing you a bottle to take home.

Part B excludes drugs patients normally give themselves, with narrow exceptions for items such as blood clotting factors and certain kidney dialysis drugs.⁶ It also covers immunosuppressive drugs for organ transplant recipients, including a dedicated benefit for kidney transplant patients whose regular Medicare eligibility has ended.⁷

For a Part B drug, you pay 20% coinsurance after meeting the annual deductible of $283 in 2026. The standard Part B premium is $202.90 per month, and higher earners pay more.⁸

Prescriptions From a Pharmacy

Most of what people picture when they hear “prescription” is a Part D drug: pills, capsules, patches, and self-injectables picked up at a retail pharmacy or delivered by mail. Part D plans are run by private insurers approved by Medicare, and you choose a plan based on the monthly premium, the pharmacy network, and which drugs are covered.

No plan may charge a Part D deductible higher than $615 in 2026, and many charge less or waive it.⁹ Every plan must cover a broad range of categories, including protected classes such as cancer, HIV/AIDS, and mental health medications, where restricted access could be dangerous.¹⁰ Federal rules also require every formulary to include at least two drugs in each therapeutic category, so you have alternatives if one medication doesn’t work for you.¹¹

Part D also pays for commercially recommended adult vaccines at no cost to you. Shingles is the notable example, since Part B does not cover it, and there is no copay and no deductible.¹²

Plans use several tools to manage costs and steer you toward cheaper options. Prior authorization requires your doctor to get the plan’s approval, typically by documenting medical necessity. Step therapy makes you try a less expensive drug first before the plan will cover a pricier one. Quantity limits cap how much of a drug you can get per fill or per month.¹³

What You’ll Pay for Part D in 2026

The Inflation Reduction Act eliminated the old coverage gap and created a hard ceiling on Part D out-of-pocket spending. In 2026, that ceiling is $2,100. Once you hit it, you pay nothing for covered drugs for the rest of the year.¹ The redesigned benefit moves through three phases:

Deductible phase. You pay full price until you have spent up to your plan’s deductible, which can be no more than $615.
Initial coverage phase. You pay 25% coinsurance for covered drugs, with the plan, manufacturers, and Medicare splitting the rest. This continues until your out-of-pocket costs reach $2,100.
Catastrophic phase. You pay $0 for the rest of the year.

If paying up to $2,100 in the first months of the year would strain your budget, every Part D plan is now required to offer a monthly payment option that spreads your out-of-pocket costs across the calendar year instead of collecting them at the pharmacy counter. If you opted in for 2025, enrollment automatically renews for 2026 unless you opt out.¹⁴

For the first time, Medicare has negotiated prices directly with drug manufacturers for ten widely prescribed Part D medications. These Maximum Fair Prices took effect January 1, 2026, and if you take one of the listed drugs your copay or coinsurance is now calculated from the lower negotiated price.¹⁵ Additional drugs will be selected for negotiation in future years.

Insulin has its own protection. The Inflation Reduction Act capped covered insulin at $35 per month under both Part D and Part B. The cap applies regardless of which plan you’re in and regardless of whether you’ve met your deductible, and you don’t need to apply for it.

Medications Medicare Won’t Pay For

Federal law writes several categories out of Part D coverage entirely. Plans are prohibited from paying for:

Weight loss and weight gain drugs, even when prescribed for a condition like obesity. CMS is launching a payment demonstration in July 2026 for GLP-1 medications used for weight loss, which will operate outside the standard Part D benefit.¹⁶
Fertility drugs.
Cosmetic drugs and hair growth products.
Cough and cold remedies.
Over-the-counter medications, even when a doctor writes a prescription for one.
Prescription vitamins, except prenatal vitamins and fluoride preparations.
Erectile dysfunction drugs, unless prescribed for a different FDA-approved use.

These exclusions come from 42 U.S.C. § 1395w-102, which ties Part D’s excluded list to the one used by Medicaid, with a few carve-outs. Barbiturates are covered when used for epilepsy, cancer, or chronic mental health conditions, and benzodiazepines and smoking cessation drugs are covered despite being excluded under Medicaid rules.¹⁷

One more boundary is worth knowing. A drug covered under Part A or Part B cannot also be run through your Part D plan. If Medicare pays for your chemotherapy infusion through Part B, that same drug won’t be billed to Part D.

Help Paying for Drug Costs

Medicare’s Extra Help program pays for most or all of your Part D premiums, deductibles, and copays if your income and savings fall below set thresholds. For 2026, the resource limits for the full benefit are $16,590 for an individual and $33,100 for a married couple. Those limits rise to $18,090 and $36,100 respectively if you have set money aside for burial expenses.¹⁸ Income thresholds are tied to the federal poverty level and will be published separately in early 2026. You apply through Social Security. If you qualify, copays often drop to a few dollars per prescription.

Enrolling On Time to Avoid a Penalty

Your initial enrollment period runs for seven months around your 65th birthday, starting three months before the month you turn 65 and ending three months after. The annual open enrollment period runs October 15 through December 7, with changes taking effect January 1. From January 1 through March 31, a separate Medicare Advantage open enrollment period lets you switch between Advantage plans or return to Original Medicare and pick up a standalone Part D plan. Special enrollment periods apply if you lose employer coverage, move out of your plan’s service area, qualify for Extra Help, or experience other qualifying life changes.¹⁹

If you go without Part D or equivalent drug coverage for more than 63 continuous days after you’re first eligible, Medicare tacks a permanent penalty onto your monthly premium. The penalty is 1% of the national base beneficiary premium, which is $38.99 in 2026, multiplied by the number of full months you went uncovered.⁹ Someone who waited two full years before enrolling would owe 24% of $38.99, roughly $9.36 per month, added to the premium going forward. The amount gets recalculated each year with the current base premium, so it compounds over time.

The only way to avoid the penalty is to keep creditable coverage the whole time, meaning drug coverage expected to pay at least as much as a standard Part D plan. Employer plans, TRICARE, and VA coverage usually qualify. Discount cards, free clinic samples, and drug discount websites do not.²⁰

1
Centers for Medicare & Medicaid Services (CMS). Draft CY 2026 Part D Redesign Program Instructions Fact Sheet
2
eCFR. 42 CFR Part 409 – Hospital Insurance Benefits
3
Centers for Medicare & Medicaid Services (CMS). 2026 Medicare Parts A and B Premiums and Deductibles
4
Medicare.gov. SNF Care Coverage
5
CMS. Medicare Drug Coverage Under Part A, Part B, and Part D
6
eCFR. 42 CFR 410.29 – Limitations on Drugs and Biologicals
7
Centers for Medicare & Medicaid Services. Medicare Part B Immunosuppressive Drug Benefit
8
Medicare.gov. Costs
9
Medicare.gov. How Much Does Medicare Drug Coverage Cost
10
Medicare.gov. What Do Drug Plans Cover
11
Centers for Medicare & Medicaid Services (CMS). Medicare Prescription Drug Benefit Manual – Chapter 6 – Part D Drugs and Formulary Requirements
12
Medicare.gov. Shingles Shots
13
Medicare.gov. Drug Plan Rules
14
Centers for Medicare & Medicaid Services. Contract Year 2026 Policy and Technical Changes to the Medicare Advantage Program, Medicare Prescription Drug Benefit Program
15
Centers for Medicare & Medicaid Services. Medicare Drug Price Negotiation Program: Negotiated Prices for Initial Price Applicability Year 2026
16
Centers for Medicare & Medicaid Services. CMS Launches Voluntary Model to Expand Access to Life-Changing Medicines
17
Office of the Law Revision Counsel. 42 US Code 1395w-102 – Prescription Drug Benefits
18
Centers for Medicare & Medicaid Services (CMS). Calendar Year 2026 Resource and Cost-Sharing Limits for Low-Income Subsidy
19
Medicare.gov. Your Guide to Medicare Drug Coverage
20
Medicare.gov. Creditable Prescription Drug Coverage