Understanding the Medicare Part D Coverage Gap (“Donut Hole”)
The Medicare Part D “Donut Hole,” also known as the Coverage Gap, used to be one of the most confusing parts of Medicare prescription drug coverage.
The good news is that major changes went into effect starting in 2025, and the traditional donut hole has effectively been eliminated.
This change makes Medicare drug coverage much easier to understand and significantly limits how much beneficiaries pay for medications each year.
Prescription Drug Coverage (Part D)
Understanding the Medicare Part D Coverage Gap (“Donut Hole”)
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What Was the Medicare Donut Hole?
In previous years, Medicare Part D plans had several stages of drug coverage. After spending a certain amount on prescriptions, beneficiaries would enter the Coverage Gap, commonly called the Donut Hole.
While in the donut hole, beneficiaries had to pay a larger share of their medication costs until they reached the next phase of coverage.
This structure often created confusion and unexpected prescription costs for many people on Medicare.
What Changed in 2025?
Beginning in 2025, the Inflation Reduction Act introduced a major change to Medicare Part D coverage.
The donut hole was removed and replaced with a simple annual out-of-pocket spending limit.
Once you reach this limit, your prescription drug costs for the remainder of the year are covered.
2025 Out-of-Pocket Limit
For 2025, Medicare beneficiaries will pay no more than $2,000 out-of-pocket for covered prescription medications during the year.
Once this threshold is reached:
- You will no longer pay copays or coinsurance for covered medications
- Your drug plan continues covering prescriptions for the rest of the calendar year
- Costs reset on January 1 of the following year
This change provides significant financial protection for people who take expensive medications.
How Part D Coverage Works Now
Although the donut hole is gone, Part D plans still have coverage stages.
Deductible Stage
Some drug plans have a yearly deductible. During this stage, you pay the full cost of your medications until the deductible is met.
For 2026, the maximum deductible allowed is $615, although many plans offer lower deductibles or waive them for certain generic drugs.
Initial Coverage Stage
After the deductible, you begin paying copays or coinsurance based on your drug’s tier.
Typical tiers include:
- Tier 1 – Preferred generic medications
- Tier 2 – Generic medications
- Tier 3 – Preferred brand-name drugs
- Tier 4 – Non-preferred brand-name drugs
- Tier 5 – Specialty medications
Catastrophic Coverage
Once your total out-of-pocket drug costs reach $2,100, you move into catastrophic coverage and pay $0 for covered prescriptions for the rest of the year.
Why Choosing the Right Drug Plan Matters
Even with the new $2,100 spending cap, drug plans can still vary significantly in:
- Monthly premiums
- Deductibles
- Pharmacy networks
- Medication coverage (formularies)
Two plans may cost the same monthly but produce very different yearly drug costs depending on the medications you take.
That’s why it’s important to review your prescriptions each year during Medicare’s Annual Election Period (October 15 – December 7).
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