In 2026, once your out-of-pocket spending on covered Part D prescriptions reaches $2,100, you pay nothing more for covered drugs for the rest of the year. The cap rose from $2,000 in 2025 to $2,100 in 2026 as an inflation adjustment. It applies whether your drug coverage comes from a stand-alone Part D plan or is built into a Medicare Advantage plan.
This is the hard annual limit created by the Inflation Reduction Act, and it replaced the old "donut hole" structure entirely. Here is how the money actually flows.
How does Part D coverage work in 2026?
Two stages, then done:
| Stage | What you pay | 2026 numbers |
|---|---|---|
| 1. Deductible | 100% of drug costs until the deductible is met | Up to $615 (plans can set lower) |
| 2. Initial coverage | Roughly 25% coinsurance (or your plan’s copays) | Until your out-of-pocket total hits $2,100 |
| 3. Catastrophic | $0 for covered drugs | Rest of the calendar year |
What counts toward the $2,100: your deductible, copays, and coinsurance for covered drugs. What does not count: your monthly plan premium, and drugs your plan doesn’t cover.
Who actually hits the cap?
People taking brand-name or specialty medications hit it fast — sometimes with a single fill in January. If you take only generics with small copays, you may never reach it.
The practical effect: no one with Part D coverage pays more than $2,100 out of pocket for covered prescriptions in 2026, no matter how expensive the drug list is. Before 2024, catastrophic-stage coinsurance had no ceiling, and five-figure annual drug bills were possible.
Can you spread the $2,100 across the year?
Yes. The Medicare Prescription Payment Plan (the "smoothing" option) lets you pay your out-of-pocket drug costs in monthly installments billed by your plan instead of at the pharmacy counter. It doesn’t reduce what you owe — it spreads the timing. It helps most if you’d otherwise face a large bill in the first months of the year. You opt in through your drug plan.
What about premiums — did those change too?
Premiums vary by plan and region, and they’re separate from the cap. Note that the Part D cap is drug coverage only; hospital and doctor cost-sharing runs through Parts A and B. For the other side of the ledger, see the 2026 Part B premium of $202.90.
If money is tight, two programs can cut drug costs below even the capped amount:
- Extra Help (Low-Income Subsidy) — pays Part D premiums and reduces copays for people with limited income and resources.
- Medicare Savings Programs — pay Part B premiums, and qualifying automatically enrolls you in Extra Help. Income limits are in our guide to Medicare Savings Programs in 2026. If you have both Medicare and Medicaid, drug costs drop further still — see how dual eligibility works.
FAQ
Q. Does the $2,100 cap include my premiums?
A. No. Premiums are separate and don’t count toward the cap.
Q. I’m on a Medicare Advantage plan. Does the cap apply to me?
A. Yes, for the prescription drug portion of your plan. Medical (hospital/doctor) out-of-pocket costs have their own separate MA plan limit.
Q. Do drugs my plan doesn’t cover count toward the cap?
A. No. Only covered drugs count. If a drug you need isn’t on the formulary, ask your plan about an exception request.
Q. What happens to the cap in 2027?
A. It adjusts with inflation each year, the same way it moved from $2,000 to $2,100 for 2026.