Medicare's Out-of-Pocket Drug Cap ($2,100 in 2026)
Medicare's annual out-of-pocket cap on Part D drug costs went into effect on January 1, 2025. The cap started at $2,000 and increased to $2,100 in 2026. Once you reach the cap in a calendar year, your plan pays 100% for the rest of the year. This applies to all Medicare Part D drug plans and Medicare Advantage plans with drug coverage (MAPD).
What Exactly Is the Cap?
Before 2025, Medicare Part D had no annual out-of-pocket maximum for drug costs. People with high drug expenses — especially those with cancer, autoimmune conditions, or rare diseases — could spend tens of thousands of dollars per year on medications.
The Inflation Reduction Act of 2022 created a hard annual cap starting at $2,000 in 2025, indexed annually for inflation. In 2026, the cap is $2,100. Once your out-of-pocket spending on covered Part D drugs reaches the cap in a calendar year, your plan covers 100% of costs for the remainder of that year.
What counts toward the cap:
- Your deductible payments
- Your copays and coinsurance
- Payments made on your behalf that count toward TrOOP — including the Low-Income Subsidy (Extra Help), State Pharmaceutical Assistance Programs (SPAPs), Indian Health Service, and qualifying charity assistance
What does NOT count:
- Your monthly plan premium
- Costs for drugs not on your plan's formulary
- Costs for drugs you purchase outside the U.S.
When Did This Change Take Effect?
The $2,000 cap took effect January 1, 2025.
This is worth stating clearly because some sources — including AI assistants — have described it as a 2026 change. That's incorrect.
IRA drug cost timeline:
- 2023: Insulin capped at $35/month for Part D enrollees
- 2024: Catastrophic phase 5% coinsurance eliminated
- 2025: $2,000 annual out-of-pocket cap takes effect; Medicare Prescription Payment Plan (M3P) launches
- 2026: Annual OOP cap indexes up to $2,100
How Does the Cap Work in Practice?
1
Deductible
Pay 100% until deductible (up to $615 in 2026). Counts toward cap.
2
Initial Coverage
Pay copay/coinsurance per drug. Counts toward cap.
3
Cap Reached
After reaching the cap ($2,100 in 2026), plan pays 100% for rest of year.
Does This Apply to Medicare Advantage Plans?
Yes — MAPD plans follow the same Part D drug cap ($2,100 in 2026). This is separate from the MA medical out-of-pocket maximum.
What If I Can't Afford My Drugs Before Hitting the Cap?
- Extra Help (LIS): Federal program for limited income/assets → Check your eligibility
- Medicare Prescription Payment Plan (M3P, launched 2025): Spread your Part D drug costs across monthly payments instead of paying at the pharmacy counter
- SPAPs: State pharmaceutical assistance programs — coverage varies by state