Yes, most Medicare Part D plans have a deductible, though the amount varies by plan. For 2025, no Part D plan can charge a deductible higher than $590. For 2026, that cap rises to $615. Some plans set their deductible well below the maximum, and a smaller number of plans have no deductible at all.
How the Part D Deductible Works
The deductible is the amount you pay out of pocket for prescriptions before your plan starts sharing the cost. During this phase, you’re responsible for 100% of your covered drug costs. Once you’ve spent enough to meet your plan’s deductible, you move into the initial coverage stage, where you typically pay 25% of the cost for both generic and brand-name drugs.
After that, if your total out-of-pocket spending on covered drugs reaches the annual cap ($2,000 in 2025, $2,100 in 2026), you enter catastrophic coverage. At that point, you pay nothing for covered Part D drugs for the rest of the calendar year. This $2,000 cap, introduced by the Inflation Reduction Act, is a major shift from previous years when out-of-pocket costs could climb into the thousands.
Not Every Plan Charges the Maximum
The $590 figure for 2025 is a ceiling, not a standard amount. Most plans charge less. In 2025, the average deductible across all Part D plans is roughly $378, about 64% of the maximum allowed. That’s a noticeable jump from 2023 and 2024, when average deductibles hovered closer to $261 and $273 respectively.
The type of plan matters too. Standalone Part D plans (the kind you add to Original Medicare) tend to have higher deductibles than Part D coverage bundled into Medicare Advantage plans. In 2025, standalone plans average about $490 for their deductible, while Medicare Advantage plans with drug coverage average around $228. Some plans in both categories waive the deductible entirely, meaning you start paying copays or coinsurance from your very first prescription.
Why Deductibles Have Been Rising
The Inflation Reduction Act reshaped how Part D costs are distributed. The new $2,000 annual out-of-pocket cap protects people who take expensive medications, but it also shifted more financial risk onto insurance plans. In response, many plans have raised deductibles and adjusted cost-sharing in other ways. The share of standalone plan enrollees facing coinsurance (a percentage of the drug’s cost) rather than flat copays for preferred brand-name drugs climbed to 84% in 2025. For Medicare Advantage enrollees, that figure reached about 28%.
Monthly out-of-pocket costs for common high-spending brand-name drugs reflect this trend. In standalone plans, the average monthly cost for nine widely used brand-name medications rose to $108 in 2025, up from lower levels in prior years. In Medicare Advantage plans, the same drugs averaged $73 per month.
Some Drugs May Be Covered Before the Deductible
Many Part D plans exempt certain drug tiers from the deductible. Low-cost generics, often classified as Tier 1, are frequently covered with a small copay from day one, even if you haven’t met your deductible yet. This varies by plan, so it’s worth checking your plan’s formulary and benefit structure. If you primarily take inexpensive generic medications, a plan with a higher deductible but no deductible on generics could still cost you less overall than a plan with a lower deductible that applies to all tiers.
Extra Help for Lower-Income Enrollees
If you have limited income and resources, the Extra Help program (also called the Low-Income Subsidy) can reduce or eliminate your Part D deductible along with other costs like copays and premiums. The program is administered through Social Security, and eligibility is based on your income and assets. People who qualify for full Extra Help typically pay no deductible at all and have minimal copays for each prescription.
How to Compare Plan Deductibles
During Medicare’s annual Open Enrollment (October 15 through December 7), you can compare Part D plans on Medicare.gov using your specific drug list. When evaluating plans, the deductible alone doesn’t tell the full story. A plan with a $0 deductible often charges a higher monthly premium, and a plan with the maximum $590 deductible might cost less over the year if your medications are mostly generics that the plan covers outside the deductible. The most useful comparison is your estimated total annual cost: premiums plus deductible plus copays or coinsurance for the drugs you actually take.