How Medicare Part D Cost Sharing Works in 2026
Medicare Part D prescription drug coverage has undergone some of the most significant changes in its history — including a landmark $2,100 out-of-pocket cap that took effect in 2025 and continues in 2026. If you are still thinking about Part D the way it worked a few years ago with the dreaded "donut hole," it's time for an update. This guide explains exactly how Medicare Part D cost sharing works in 2026 so you can make the most informed decision about your prescription drug coverage.
The Biggest Part D Change in Years — The $2,100 Out-of-Pocket Cap
Starting in 2025 and continuing in 2026, Medicare Part D has a $2,100 annual out-of-pocket cap on covered prescription drugs. This is one of the most significant improvements to Medicare in decades — and it eliminates the old coverage gap (donut hole) that used to leave beneficiaries with large drug costs mid-year.
Once you have spent $2,100 out of pocket on covered Part D drugs in 2026, your plan pays 100% of the cost of your covered medications for the rest of the year — no matter how expensive your drugs are.
2026 Medicare Part D Cost Sharing Stages
Part D cost sharing works in two main stages in 2026:
Stage 1 — Annual Deductible
Most Part D plans have an annual deductible — the amount you pay for covered drugs before your plan begins sharing costs. In 2026 the maximum Part D deductible is $615. Some plans have a lower deductible or no deductible at all — particularly for lower-tier generic drugs.
Stage 2 — Initial Coverage
After meeting your deductible you enter the initial coverage phase where you pay copays or coinsurance for your covered drugs and your plan pays its share. Your cost-sharing amount depends on which tier your drug falls into on the plan's formulary.
2026 Part D Drug Tiers — How Copays Work
Most Part D plans organize drugs into tiers — with lower tiers costing less and higher tiers costing more. A typical 2026 tier structure looks like this:
| Tier | Drug Type | Typical Cost |
|---|---|---|
| Tier 1 | Preferred generic drugs | $0 – $5 copay |
| Tier 2 | Non-preferred generic drugs | $5 – $15 copay |
| Tier 3 | Preferred brand-name drugs | $30 – $47 copay |
| Tier 4 | Non-preferred brand-name drugs | $80 – $100 copay |
| Tier 5 | Specialty drugs | 25–33% coinsurance |
Tier structures and exact copay amounts vary by plan. This is why it is so important to run a drug-by-drug comparison before choosing a Part D plan.
2026 Part D Out-of-Pocket Cap — What Counts
The $2,100 out-of-pocket cap counts the following toward your total:
- ✅ Your annual deductible payments
- ✅ Copays and coinsurance for covered drugs during initial coverage
- ✅ Manufacturer discounts on brand-name drugs
The following do NOT count toward your $2,000 cap:
- ❌ Monthly plan premiums
- ❌ Costs for drugs not on your plan's formulary
- ❌ Costs for drugs purchased outside your plan's network pharmacy
The Medicare Prescription Payment Plan — New in 2025
Also new in 2025 and continuing in 2026 is the Medicare Prescription Payment Plan — a voluntary program that allows you to spread your out-of-pocket drug costs evenly across monthly payments throughout the year rather than paying large amounts at once. This can be especially helpful if you take expensive medications early in the year before your deductible is met.
What Happened to the Coverage Gap (Donut Hole)?
The coverage gap — commonly known as the "donut hole" — has been eliminated as of 2025. Under the old system beneficiaries faced significantly higher drug costs once they reached a certain spending threshold. The new $2,100 out-of-pocket cap replaces this system entirely, giving Part D enrollees much more predictable and affordable drug coverage.
Extra Help — Low Income Subsidy for Part D
If you have limited income and resources you may qualify for Extra Help — a federal program that helps pay Part D premiums, deductibles, and copays. In 2026 Extra Help beneficiaries pay significantly reduced cost-sharing for their medications. Contact Social Security at 1-800-772-1213 or visit SSA.gov to apply.
How to Choose the Right Part D Plan
Choosing the right Part D plan is not just about finding the lowest premium — it's about finding the plan that covers your specific medications at the lowest total cost. Here's what to look for:
- Formulary coverage — make sure all your medications are on the plan's drug list
- Tier placement — check which tier your drugs fall on and what the copay is
- Deductible — compare plans with and without deductibles
- Pharmacy network — confirm your preferred pharmacy is in network
- Total annual cost — add premiums + deductible + copays for a true comparison
Frequently Asked Questions About Part D Cost Sharing
What is the Part D out-of-pocket maximum in 2026?
The 2026 Part D out-of-pocket cap is $2,100. Once you reach this amount your plan covers 100% of your covered drug costs for the rest of the year.
What is the maximum Part D deductible in 2026?
The maximum Part D deductible in 2026 is $615. Many plans have lower deductibles or no deductible for generic drugs.
Is the coverage gap (donut hole) still a thing in 2026?
No — the coverage gap has been eliminated as of 2025. The new $2,000 out-of-pocket cap replaces the old donut hole system entirely.
Do premiums count toward the $2,100 out-of-pocket cap?
No — monthly plan premiums do not count toward the $2,100 out-of-pocket cap. Only deductibles, copays, coinsurance, and manufacturer discounts on brand-name drugs count toward the cap.
Can I change my Part D plan if my drugs aren't covered?
You can change your Part D plan during the Annual Enrollment Period (October 15 – December 7) each year. If you have a qualifying life event you may also be eligible for a Special Enrollment Period.
Get Help Choosing the Right Part D Plan
As an independent Medicare broker I run a drug-by-drug analysis for every client to find the Part D plan that covers your specific medications at the lowest total annual cost — completely free of charge. I serve clients in New York, New Jersey, and nationwide.
📞 Call (917) 740-1895 or schedule a free Medicare Part D consultation today.
We are not connected with or endorsed by the United States Government or the federal Medicare program. For official Medicare information visit Medicare.gov or call 1-800-MEDICARE.
