Medicare Part D Coverage Phases: Deductible, Initial Coverage, and the Out-of-Pocket Cap
Part D drug coverage now has an annual out-of-pocket cap, after which covered drugs cost nothing for the rest of the year. Here is how the phases work, with a month-by-month example and the payment plan option.
Medicare Part D drug costs used to involve a confusing "coverage gap" or "donut hole." Under changes that took effect in 2025, the gap is gone and there's an annual cap on what you pay out of pocket for covered Part D drugs. The cap began at $2,000 in 2025 and is adjusted each year; the official amount for the current year is on Medicare.gov.
The phases
- Deductible. You pay full cost of covered drugs until the plan's deductible is met. Some plans have no deductible or exclude certain tiers.
- Initial coverage. You pay copays or coinsurance; the plan pays the rest.
- Out-of-pocket cap reached. Your spending on covered drugs hits the annual limit.
- Catastrophic phase. You pay nothing for covered Part D drugs for the rest of the year.
- Reset. Everything starts over January 1.
Plans set their own deductibles up to a maximum set by Medicare, and their own copays and coinsurance, as long as coverage is at least as good as the standard benefit.
A month-by-month example
Hypothetical numbers: a plan with a $600 deductible, 25% coinsurance, and a $2,000 annual out-of-pocket cap. The member's covered drugs cost $1,200 a month.
| Month | What happens | Member pays |
|---|---|---|
| January | $600 deductible, then 25% of the remaining $600 | $750 |
| February | 25% of $1,200 | $300 |
| March | 25% of $1,200 | $300 |
| April | 25% of $1,200 | $300 |
| May | 25% of $1,200 | $300 |
| June | Reaches $2,000 cap | $50 |
| July–December | Catastrophic phase | $0 |
| Total | $2,000 |
Spreading costs: the Medicare Prescription Payment Plan
Front-loaded costs can be hard to manage. The Medicare Prescription Payment Plan lets you pay your out-of-pocket drug costs in monthly installments over the calendar year instead of at the pharmacy. It doesn't reduce what you owe in total; it spreads it out. There's no interest or fee for the program itself.
Using the example above and enrolling in January, monthly bills would rise gradually as costs are added and spread over the months left in the year:
Show the numbers behind this chart
| Paid at pharmacy | Payment plan bills | |
|---|---|---|
| Jan | $750 | $62 |
| Feb | $300 | $90 |
| Mar | $300 | $120 |
| Apr | $300 | $153 |
| May | $300 | $191 |
| Jun | $50 | $198 |
| Jul | $0 | $198 |
| Aug | $0 | $198 |
| Sep | $0 | $198 |
| Oct | $0 | $198 |
| Nov | $0 | $198 |
| Dec | $0 | $198 |
The payment plan tends to help most for people with high costs early in the year. It's less useful for people with low drug costs.
Things to know
- Only covered drugs count. Drugs not on your plan's formulary, or bought outside the plan's rules, don't count toward the cap.
- Insulin. Covered insulin has a monthly cost-sharing limit under Medicare drug plans.
- Premiums don't count toward the cap.
- Extra Help lowers costs for people with limited income and resources.
- Compare plans every year. Formularies, pharmacy networks, and costs change. Use the Medicare.gov plan finder with your exact drug list.
See Medicare basics for how Part D fits with the rest of Medicare, and enrollment periods and penalties for the Part D late penalty.
The takeaway
Part D now moves through a deductible, an initial coverage phase, and then a catastrophic phase where covered drugs cost nothing once the annual cap is reached. The payment plan can spread those costs across the year. The cap and deductible limits change annually, so check the current figures on Medicare.gov.
Sources
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