The Medicare Part D coverage gap (donut hole) has been effectively eliminated thanks to the Inflation Reduction Act. Starting in 2025, Medicare beneficiaries pay no more than a fixed amount out of pocket for prescription drugs in a calendar year. That cap was $2,000 in 2025 and is indexed upward each year after. This guide explains the current benefit structure, how the cap works, and what has changed from the old donut hole system.
Key Facts
Check Your Specific Plan's Formulary
Coverage varies by plan. Use our formulary checker tool to look up your exact copay and restrictions.
Open Formulary CheckerSources and standards behind this page
Drug coverage in the United States is governed by published rules rather than by any one insurer's summary, and the sources below are the primary ones. They are linked so a reader can check a claim without taking this page's word for it.
- FDA Orange Book publishes the therapeutic-equivalence ratings that decide whether a generic may be substituted for a brand-name drug.
- FDA generic drug facts sets out what "generic equivalent" means and what a manufacturer must prove.
- CMS prescription drug coverage defines the rules a Medicare drug plan formulary must follow and how it may change mid-year.
- Medicare.gov drug coverage (Part D) states what a Part D plan is required to offer a member.
- CMS prescription drug appeals documents the coverage-determination and exception process when a drug is denied.
This page describes how coverage and formularies work. It is not medical advice, and a reader's own plan documents and prescriber decide what applies to them.
Frequently Asked Questions
Effectively, yes. While the coverage phases technically still exist, the annual out-of-pocket cap means your total spending on covered drugs is limited. That cap was $2,000 in 2025 and is indexed upward each year after. The old donut hole could cost thousands in the gap. Now, once you reach the cap, your plan covers everything at 100% for the rest of the year.
All your out-of-pocket spending on covered Part D drugs (copays, coinsurance, deductible payments) counts toward the annual cap, which was $2,000 in 2025 and is indexed upward each year after. Once your true out-of-pocket costs reach it, you enter catastrophic coverage where your plan pays 100%. The Medicare Prescription Payment Plan lets you pay that amount in equal monthly installments instead of all at once.
This optional program lets you spread your Part D out-of-pocket drug costs across the year in predictable monthly payments, similar to a payment plan. Instead of paying large copays at the pharmacy, you make equal monthly payments to your Part D plan. You can opt in at any time by contacting your plan.
Related Resources
- Medicare Part D Formulary 2026
- Medicare Advantage Formulary 2026
- Humana Formulary 2026
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