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For decades, Medicare Part D had a design flaw: once your drug spending crossed a certain threshold — the infamous “donut hole” — your costs actually increased. The 2010 Affordable Care Act started closing the donut hole, but it wasn’t until the Inflation Reduction Act of 2022 that Congress created a true out-of-pocket cap.
That cap is now in effect. Here’s exactly how it works and what it means for your Medicare drug coverage.
What Changed With Part D in 2025 and 2026
The Inflation Reduction Act (IRA) of 2022 restructured Medicare Part D in several stages:
| Year | IRA Change | Impact |
|---|---|---|
| 2023 | Insulin capped at $35/month | Lower costs for diabetics |
| 2024 | Manufacturer discounts in catastrophic phase required | Reduced plan costs in high-spend years |
| 2025 | $2,000 out-of-pocket cap introduced; M3P available | Hard cap on annual drug spending for first time ever |
| 2026 | Cap continues; Medicare drug price negotiations take effect for more drugs | Lower formulary costs on negotiated drugs |
The cap went into effect January 1, 2025. In 2026, the standard Part D out-of-pocket cap remains $2,000. Some plans set even lower caps, but no Medicare drug plan can set the threshold higher than $2,000.
How the $2,000 Cap Works
The cap is simple in principle: track your total out-of-pocket spending on covered Part D drugs throughout the year. The moment that total hits $2,000, you move into the catastrophic phase and pay nothing for covered drugs for the rest of the calendar year.
The clock resets every January 1.
What Counts Toward the $2,000 Cap
Not every dollar you spend on prescription drugs counts toward the $2,000 threshold. Here’s the breakdown:
| Spending Type | Counts Toward Cap? |
|---|---|
| Annual Part D deductible (paid at the pharmacy) | ✅ Yes |
| Copays and coinsurance for covered drugs | ✅ Yes |
| Monthly Part D premiums | ❌ No |
| Drugs NOT on your plan’s formulary | ❌ No |
| Over-the-counter medications | ❌ No |
| Extra Help / Low Income Subsidy amounts | ❌ No |
| Manufacturer discount program amounts (on covered drugs) | ✅ Yes (new rule for 2025+) |
The inclusion of manufacturer discounts as counting toward the cap is a notable change from prior years. Previously, manufacturer rebates and discounts in the donut hole didn’t count toward beneficiary spending totals, which slowed many people’s path to catastrophic coverage. That changed in 2025.
The Three Phases of Part D Coverage in 2026
You pay 100% of drug costs until you meet your plan’s deductible. The standard 2026 deductible is up to $590, but many plans set it lower or waive it for certain tiers.
After meeting your deductible, you pay your plan’s copays or coinsurance. Your plan pays the rest. This phase continues until you’ve spent $2,000 out-of-pocket.
Once you’ve spent $2,000 out-of-pocket on covered drugs, you pay $0 for the rest of the calendar year. No copays, no coinsurance — zero. This is new as of 2025.
Who Benefits Most From the $2,000 Cap
The cap helps anyone who takes expensive medications, but some groups benefit dramatically more than others:
People on specialty drugs
Specialty medications for cancer, multiple sclerosis, rheumatoid arthritis, Crohn’s disease, and similar conditions can carry retail prices of $5,000–$30,000 per month. Under the old rules, these beneficiaries could spend $10,000+ out-of-pocket annually. Under the new cap, they spend a maximum of $2,000 — a transformative difference.
Diabetics on GLP-1 medications
Ozempic and Mounjaro, covered by Part D for diabetes, can cost $40–$150 per month in copays. High-tier specialty placement can mean beneficiaries hit $2,000 by mid-year, after which their costs drop to zero. Insulin remains separately capped at $35/month regardless of where you are in the benefit phases.
Anyone with multiple chronic conditions
Seniors taking five or more medications — common in people managing heart disease, diabetes, COPD, and arthritis simultaneously — accumulate Part D spending quickly. The cap provides a predictable annual ceiling for household budget planning.
People who previously skipped medications due to cost
Studies consistently show that Medicare beneficiaries who hit the old donut hole often skipped doses or stopped taking medications to manage costs. The $2,000 cap is expected to reduce this dangerous behavior significantly.
The Medicare Prescription Payment Plan (M3P)
Even a $2,000 annual cap can feel like a large bill if you hit it in January or February — paying $2,000 in two months is painful even if you pay $0 for the rest of the year.
To address this, the Inflation Reduction Act also created the Medicare Prescription Payment Plan (M3P), which launched in 2025. M3P allows you to spread your out-of-pocket drug costs across equal monthly payments throughout the year, rather than paying large amounts at the pharmacy counter.
How M3P works
- You opt in through your Part D plan (it’s not automatic)
- Instead of large copays at the pharmacy, you pay a calculated monthly amount spread over the year
- Your plan bills you monthly, similar to a phone bill
- Your total annual spending doesn’t change — just how it’s distributed
- M3P is most valuable to people who expect to hit the $2,000 cap (specialty drug users)
To enroll in M3P, contact your Part D plan directly. You can switch in or out of M3P at certain times during the year.
Does the $2,000 Cap Apply to Medicare Advantage Plans?
Yes. If you have a Medicare Advantage plan with drug coverage (an MA-PD plan), the $2,000 out-of-pocket cap applies to the drug benefit portion of your plan. The federal law applies uniformly to all Medicare drug coverage — standalone Part D plans and MA-PD plans alike.
Note that Medicare Advantage plans have a separate out-of-pocket maximum for medical services (doctor visits, hospital stays, etc.). That limit is different from the drug cap and is set by CMS each year. In 2026, the Medicare Advantage maximum out-of-pocket for in-network medical services is $9,350.
| Coverage Type | Drug Cap (2026) | Medical OOP Max (2026) |
|---|---|---|
| Standalone Part D (with Original Medicare) | $2,000 | No cap on medical (Medigap recommended) |
| Medicare Advantage + Drug (MA-PD) | $2,000 for drugs | Up to $9,350 for medical (in-network) |
Find a Part D plan that minimizes your drug costs
Different plans charge different copays for the same drugs. A licensed specialist can compare plans in your area based on your specific medications.
Frequently Asked Questions
What is the Medicare Part D out-of-pocket cap in 2026?
The 2026 Medicare Part D out-of-pocket cap is $2,000. Once your annual out-of-pocket spending on covered prescription drugs reaches $2,000, you pay $0 for the rest of the calendar year.
Does the $2,000 cap apply to Medicare Advantage drug plans?
Yes. The cap applies to both standalone Part D plans and Medicare Advantage plans that include drug coverage (MA-PD plans).
Do premiums count toward the $2,000 cap?
No. Monthly Part D premiums do not count toward the out-of-pocket cap. Only your cost-sharing payments at the pharmacy (deductibles, copays, coinsurance) count.
What is the Medicare Prescription Payment Plan (M3P)?
M3P is an optional program that lets you spread your Part D drug costs across equal monthly payments throughout the year, instead of paying large amounts at the pharmacy. You must opt in through your plan — it is not automatic.
Is the donut hole still a thing in 2026?
No. The Medicare Part D coverage gap (donut hole) has been eliminated as of 2025. Part D now goes directly from the initial coverage phase to the catastrophic phase (zero-cost) once you’ve spent $2,000.
Does the $2,000 cap reset every year?
Yes. Your out-of-pocket spending resets to $0 on January 1 every year. You must reach $2,000 again in the new year to re-enter the catastrophic (zero-cost) phase.
