What does Medicare drug coverage cost? (OOP cap, IRA changes)

Four pieces. A monthly premium (the 2026 national base beneficiary premium is $38.99, but plan premiums vary widely — average around $40). A deductible (most plans have one, capped by CMS at $615 for 2026, but plans can set it lower). Copays or coinsurance on each prescription based on the plan's formulary tiers. And the new $2,100 annual out-of-pocket cap — once you hit it, you pay $0 for covered drugs the rest of the year.

Your total cost depends on your specific drugs and which plan you pick. Run Medicare.gov Plan Finder with your full drug list every fall during AEP — that's the only way to compare apples to apples.

It's the maximum you'll pay out of pocket for covered Part D drugs in a calendar year. $2,000 in 2025 (the first year of the cap), $2,100 for 2026, and it rises annually. Once your out-of-pocket spending hits the cap, your plan and Medicare cover 100% of covered drug costs the rest of the year.

This is brand new. Inflation Reduction Act Section 11201. Before the IRA there was no cap and people in the old 'donut hole' could end up paying tens of thousands a year for high-cost specialty drugs. The cap eliminates that exposure.

It's a payment plan that lets you spread your Part D out-of-pocket costs into monthly installments instead of paying everything at the pharmacy counter. Inflation Reduction Act Section 11202. Effective January 1, 2025.

You don't pay any extra. The total you owe stays the same — the plan just bills you in monthly chunks. Helpful if you have an expensive drug that would otherwise hit you hard early in the year. You enroll through your Part D plan, not Medicare directly. Your plan must offer it.

Your cost-sharing for a one-month supply of each covered insulin product is capped at $35. Inflation Reduction Act Section 11406. Effective January 1, 2023. No deductible applies before the cap.

Applies to Part D insulin and to Part B insulin (the kind delivered through an insulin pump). Which specific insulins are covered depends on your plan's formulary — not every product is on every plan. If yours isn't covered, talk to your prescriber about a covered alternative or file a formulary exception with the plan.

Show your Part D card at the pharmacy or vaccine provider. The Inflation Reduction Act eliminated cost-sharing for adult vaccines recommended by the Advisory Committee on Immunization Practices (ACIP) when covered under Part D. Effective January 1, 2023. No deductible. No copay.

That covers shingles (Shingrix), RSV, Tdap, and others on the ACIP adult schedule. Some vaccines are covered under Part B instead — flu, COVID, pneumococcal, and hepatitis B for at-risk — and Part B already covers those at $0. If a provider tries to charge you for an ACIP-recommended Part D vaccine, push back and call your plan.

Extra Help — also called the Low Income Subsidy or LIS — is a federal program that pays most of your Part D costs. People who qualify can have premiums, deductibles, and most copays drop to near zero. The income limit is 150% of the federal poverty level. There's also a resource (asset) test, but it's relatively generous and home, vehicle, and burial accounts don't count.

Apply at ssa.gov/medicare/part-d-extra-help, by calling SSA at 1-800-772-1213, or with help from your state SHIP at 1-877-839-2675. The application is free.

Because that's how Part D plans are structured. Here's the deal. The deductible is what you pay first — most plans have one, capped at $615 for 2026. After you meet the deductible, you start paying copays (a flat dollar amount per prescription) or coinsurance (a percentage of the drug's cost), depending on which tier the drug sits on in the plan's formulary.

Formularies typically have five tiers: tier 1 (preferred generics, lowest cost), tier 2 (other generics), tier 3 (preferred brand), tier 4 (non-preferred brand), and tier 5 (specialty, highest cost — usually coinsurance, not a flat copay). All of this counts toward the $2,100 annual out-of-pocket cap. Once you hit the cap, you pay $0 for covered drugs the rest of the year.

Often no. The premium is the entry fee. Your real cost depends on what drugs you take and where they sit on the plan's formulary. A plan with a $20 premium and tier-3 placement on your maintenance drug can cost more annually than a plan with a $50 premium and tier-2 placement.

Medicare.gov Plan Finder estimates TOTAL annual cost for each plan based on your drug list. That total — premium plus expected cost-sharing — is the right comparison. Don't pick on premium alone.

Inflation Reduction Act Sections 11001-11003 gave Medicare the authority to negotiate prices on certain high-cost drugs for the first time. The first 10 negotiated drug prices took effect January 1, 2026. Another 15 drugs are negotiated for 2027, 15 more for 2028, and 20 per year after that.

If you take one of the negotiated drugs, your cost-sharing is generally lower because the plan's price is lower. CMS publishes the list of negotiated drugs at cms.gov. Whether YOU see savings depends on your plan, your tier placement, and whether you've hit the OOP cap.

Hang up. Cold-call solicitation about Medicare — including Part D — is prohibited under CMS Medicare Communications and Marketing Guidelines. A legitimate broker, plan, or advisor does not call you out of the blue.

Report the call to 1-800-MEDICARE (1-800-633-4227) or your state SHIP at 1-877-839-2675. If somebody pressures you to enroll in a plan over the phone, that's a red flag. Use Medicare.gov Plan Finder, your state SHIP, or a licensed Medicare advisor like Chapter — never a stranger who called you first.