Medicare’s prescription drug benefit now carries a hard ceiling on what a member pays out of pocket for covered drugs in a calendar year, a change Congress created through the Inflation Reduction Act. Once a person’s covered drug costs for the year reach that ceiling, the plan pays the rest of the year’s covered prescriptions in full, with no further copayment or coinsurance. The cap is not the same every year: it rose for 2026 and is already scheduled to rise again for 2027.
How The Out-Of-Pocket Cap Works, Year By Year
For 2026, the annual out-of-pocket cap on covered Part D drugs is $2,100, up from $2,000 the year before. The Centers for Medicare & Medicaid Services has already set the 2027 cap at $2,400, giving plans and members a full year’s notice before the next increase takes effect. Once total spending toward the cap is reached — which includes certain payments made by programs like Extra Help on a member’s behalf — coverage moves automatically into what Medicare calls the catastrophic coverage stage.
Before that point, a member typically pays a deductible — no more than $615 in 2026, rising to $700 in 2027 — and then 25% coinsurance on covered generic and brand-name drugs during what Medicare calls the initial coverage stage, according to Medicare’s current explanation of Part D’s three cost stages. Not every plan charges a deductible, and some plans build in a lower one.
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What Counts Toward The Cap And What Doesn’t
Only spending on covered Part D drugs counts toward the annual cap, and only certain kinds of payments qualify: what the member pays directly, plus certain payments made on the member’s behalf, such as help from the Extra Help program. Premiums don’t count toward the cap, and money spent on drugs the plan doesn’t cover, or on non-covered items, doesn’t move a member closer to catastrophic coverage.
The Part D late enrollment penalty, an amount permanently added to a member’s premium for going 63 or more days without creditable drug coverage after becoming eligible, also stays outside the cap because it functions as part of the premium rather than as a cost tied to filling a specific prescription. A member paying that penalty still works toward the annual cap through ordinary deductible and coinsurance spending, just without any credit for the extra premium amount.
The cap resets every January 1, so reaching catastrophic coverage in December provides no carryover benefit into the new year — the deductible and coinsurance stages start again for whatever the new year’s amounts turn out to be. For someone on expensive medications, that reset can mean a sharp jump in January costs even after a cost-free final stretch of the prior year.
A narrower, separate cap runs alongside the annual ceiling for one specific drug category: the cost of a one-month supply of each Part B- or Part D-covered insulin product is capped at $35, with no deductible charged on insulin at all. That $35 limit applies to every person taking covered insulin, including someone who also gets Extra Help, and it holds regardless of how much progress a member has made toward the broader annual out-of-pocket cap.
Medicare requires plans to send members a monthly Explanation of Benefits once a pharmacy bills the plan, and that notice shows which prescriptions were filled, what the plan paid, what the member and others paid, the member’s current coverage stage, and how much has counted toward the annual cap so far. Reading that notice is the most direct way for a member to know how close they are to catastrophic coverage without doing the math themselves.
Spreading The Same Costs Across The Year Instead Of Paying Up Front
Congress paired the annual cap with a separate option, the Medicare Prescription Payment Plan, that lets a member spread out-of-pocket drug costs in monthly installments across the calendar year rather than paying larger amounts at the pharmacy counter early in the year. The payment plan doesn’t lower the total amount owed and doesn’t replace the annual cap — it only changes when the same dollars are due.
A member who expects to spend close to the annual cap, particularly someone taking a costly brand-name drug early in the year, is the person most likely to benefit from spreading payments, since the plan smooths out what would otherwise be the heaviest costs of the deductible and coinsurance stages.
Before the cap took effect, Part D’s catastrophic phase still charged a percentage of drug costs rather than reducing them to zero, so heavy prescription years carried costs that scaled with the price of the drug rather than stopping at a fixed dollar amount. The shift to a fixed dollar ceiling is a structural change to how Part D works, not a temporary discount — the cap is written into law and scheduled to adjust upward on a set timetable rather than expiring.
Because the 2027 figure is already public, anyone comparing Part D plans during Medicare’s Open Enrollment this fall can weigh a plan’s premium and formulary against a cap that is confirmed to rise by $300 the following year, rather than guessing at what next year’s out-of-pocket ceiling might be.
Turning A Fixed Drug Cap Into A Plan-By-Plan Comparison
Knowing the size of the annual cap doesn’t say how fast a specific plan’s deductible and coinsurance get a member there, and that speed depends entirely on which drugs a plan covers and at what tier. The cap is the same nationwide; the path to it is not.
The Medicare Cost & Coverage Protection Kit explains the new Part D out-of-pocket cap alongside a medication and cost tracker, so a member can watch spending move toward the cap refill by refill.
Compare drug costs against the cap in The Medicare Cost & Coverage Protection Kit.
This article was researched and drafted with the assistance of AI and reviewed by The Money Overview editorial team.
