Does Medicare Cover Prescriptions? Complete Drug Coverage Guide

The short answer to "does Medicare cover prescriptions" is yes, but only through specific parts of Medicare. Original Medicare (Parts A and B) does not cover most outpatient prescription drugs you fill at a pharmacy. To get prescription drug coverage, you need either a standalone Medicare Part D plan paired with Original Medicare or a Medicare Advantage plan that includes prescription drug coverage (called an MA-PD plan). The Inflation Reduction Act brought major changes that took full effect in 2025-2026. The 2026 out-of-pocket maximum for Part D drug spending is $2,100 (up from $2,000 in 2025), the maximum Part D deductible is $615, the $35 monthly insulin cap continues, and ACIP-recommended adult vaccines are now $0 cost-sharing. Approximately 54.8 million of the 68.8 million Medicare beneficiaries are enrolled in Part D plans, with 58% in MA-PD plans and 42% in standalone PDPs, according to KFF data.

This guide explains what prescriptions Medicare covers in 2026, how Part D works, costs, and how the new out-of-pocket cap protects you from runaway drug expenses. Information comes from Medicare.gov, CMS, and the Inflation Reduction Act implementation rules.

What Medicare covers for prescriptions in 2026

Medicare's prescription drug coverage operates through several pathways depending on where you receive the medication. Original Medicare Part A covers prescription drugs administered during an inpatient hospital stay or in a skilled nursing facility. Medications received as part of inpatient care are covered without separate drug coverage required. Part B covers a limited set of drugs administered in a doctor's office or outpatient setting, including chemotherapy infusions, immunosuppressant drugs after organ transplant, some injectable osteoporosis drugs, and influenza, pneumonia, and COVID-19 vaccines. These Part B drug services come with the standard 20% coinsurance after the $283 Part B deductible.

For everything else (the prescription drugs you fill at a pharmacy and take at home), you need Medicare Part D coverage. This is the biggest source of confusion for new Medicare beneficiaries: Original Medicare alone doesn't cover most prescriptions. You must actively enroll in either a standalone Part D plan with Original Medicare or a Medicare Advantage plan that includes Part D.

Most Medicare Advantage plans (called MA-PD plans) include Part D coverage automatically. About 95% of MA plans include drug coverage as part of the package. The 5% of MA plans without drug coverage are typically Private Fee-for-Service (PFFS) plans or Medical Savings Account (MSA) plans where members must enroll separately in a standalone Part D plan.

How Medicare Part D works in 2026

The Inflation Reduction Act fundamentally restructured Part D for 2025-2026. The benefit now operates in three clear phases rather than the four-phase structure with the "donut hole" that existed before.

The deductible phase comes first. You pay 100% of your drug costs until you meet your plan's annual deductible. The maximum allowable deductible for 2026 is $615 (up from $590 in 2025), though many plans set lower deductibles or have no deductible at all. About half of standalone Part D plans charge the maximum deductible, while the other half use lower amounts or tiered deductibles.

After meeting the deductible, you enter the initial coverage phase. During this phase, you pay either a fixed copay or a percentage coinsurance for each prescription. Copays typically apply to Tiers 1 and 2 (preferred generics and generics), often $0 to $20 per prescription. Coinsurance typically applies to Tiers 3, 4, and 5 (preferred brand, non-preferred drug, and specialty drugs), often 25% to 33% of the drug cost.

The catastrophic phase begins when your total out-of-pocket spending on covered drugs reaches $2,100 in 2026. After that threshold, you pay $0 for all covered medications for the rest of the calendar year. This is the new hard cap created by the Inflation Reduction Act. Before 2024, beneficiaries paid 5% coinsurance even in catastrophic coverage with no upper limit, which sometimes meant thousands of additional dollars annually for people on expensive specialty drugs.

The $2,100 cap counts your deductible payments, copays, coinsurance, and even amounts paid on your behalf through programs like Extra Help. Your monthly Part D plan premium does not count toward the $2,100 limit.

Medicare Prescription Payment Plan: spreading costs across the year

One of the most useful 2026 Part D features is the Medicare Prescription Payment Plan, which lets you spread your out-of-pocket drug costs across the calendar year through monthly payments to your plan rather than paying high single-month costs at the pharmacy.

The plan is particularly valuable for beneficiaries on expensive specialty drugs. For example, someone taking a $2,100+ monthly specialty medication would normally pay the entire $2,100 annual out-of-pocket maximum with the first January prescription. Through the Prescription Payment Plan, that same person could pay $175 per month for 12 months instead, smoothing their cash flow significantly.

Participation auto-renews for 2026 if you were enrolled in 2025 unless you opt out. New enrollees can join at any time during the year by contacting their Part D plan. The plan calculates your monthly maximum payment by subtracting your year-to-date out-of-pocket spending from the $2,100 annual maximum and dividing by the months remaining in the plan year.

Enrolling earlier in the year provides more benefit because you have more months to spread costs. A beneficiary who enrolls in November after high spending earlier in the year may face monthly payments as high as $1,050 if they have remaining unpaid amounts and only two months to spread them.

What Part D doesn't cover

Medicare Part D covers most outpatient prescription drugs but not everything. Drugs that fall outside Part D coverage include over-the-counter medications, weight loss or weight gain drugs (though obesity drugs may be covered in some plans), fertility drugs, cosmetic drugs (like Botox for cosmetic use), erectile dysfunction medications, and drugs that aren't on your plan's formulary.

Drugs covered under Medicare Part B (like chemotherapy infusions in a doctor's office) don't count toward your Part D out-of-pocket maximum. They fall under Part B's separate cost-sharing structure with the 20% coinsurance and no annual maximum, which is why many beneficiaries pair Medigap supplement coverage with Original Medicare.

Each Part D plan has its own formulary (covered drug list) and pharmacy network. A drug may be on one plan's formulary at Tier 1 but on another plan's at Tier 4 or excluded entirely. This is why comparing Part D plans annually based on your specific medications matters significantly.

2026 specific updates to prescription coverage

Several 2026 changes affect Medicare prescription coverage beyond the $2,100 cap and $615 deductible.

The $35 monthly insulin cap continues into 2026 for all insulin products. This applies to all Part D plans and means you'll pay no more than $35 per month for any insulin prescription regardless of the drug's list price. Insulin costs don't have a separate deductible: you pay the $35 copay from the first prescription onward.

All ACIP-recommended adult vaccines are now $0 cost-sharing under Part D. This includes vaccines for shingles (Shingrix), pneumonia, hepatitis B, RSV (newer), and other recommended adult vaccines. No deductible applies. The savings can be substantial since Shingrix alone previously cost $200-$300 out of pocket.

Medicare drug price negotiations took effect in 2026 with 10 drugs subject to lower negotiated prices. The first round includes Eliquis, Jardiance, Xarelto, Januvia, Farxiga, Entresto, Enbrel, Imbruvica, Stelara, and Fiasp/NovoLog insulins. Beneficiaries fill prescriptions for these drugs at the new lower negotiated prices, which reduces out-of-pocket costs and helps reach the $2,100 cap more slowly for those who need it. Beginning in 2027, an additional 15 drugs will have negotiated prices, then 15 more annually.

Low-income beneficiaries continue to benefit from Medicare Extra Help. The 2026 Extra Help income limit is $23,940 single and $32,460 married couple. Qualifying beneficiaries pay no Part D premium (with benchmark plans), no deductible, and a maximum of $5.10 for generic drugs or $12.65 for brand-name drugs.

How to choose a Part D plan in 2026

Selecting the right Part D plan requires looking beyond just the monthly premium. Each plan's formulary determines which of your specific medications are covered and at what tier. A plan with a $25 monthly premium that doesn't cover one of your essential drugs could cost thousands more than a plan with a $50 monthly premium that does.

The Medicare.gov Plan Finder is the most reliable tool. Enter your specific medications, dosages, and preferred pharmacies to compare projected annual costs across all plans available in your area. Beneficiaries in each state have between 8 and 12 standalone Part D plans plus many Medicare Advantage drug plans to choose from for 2026.

Pharmacy network matters significantly. Some plans have preferred pharmacy networks where you pay lower copays. A plan that covers your drug at $10 at a preferred pharmacy might charge $25 at a non-preferred pharmacy. If you have strong loyalty to a particular pharmacy or live where pharmacy options are limited, verify your pharmacy is in-network.

Medicare Extra Help for low-income beneficiaries provides automatic enrollment in benchmark plans (those with $0 premiums for Extra Help recipients). The 2026 system includes 88 benchmark plans nationally, with Florida and Texas having only 1 benchmark plan each and 15 states offering 4 benchmark plans.