The annual limit on what people with Medicare Part D pay out of pocket for prescription drugs is rising again in 2027, the third increase since a multi-year redesign began replacing the old coverage-gap system in 2025. Once a beneficiary’s covered drug spending for the year crosses that limit, Medicare drug plans pick up the full cost of formulary medications through December 31st, a protection that matters most to people managing cancer, autoimmune disease or other conditions treated with high-priced specialty drugs.
The number keeps moving upward each year the redesign has been in effect, and 2027 brings the largest single jump yet. How much difference it makes to any one household depends heavily on what they are prescribed and how early in the year they start filling those prescriptions.
Before the redesign, Part D enrollees with expensive prescriptions could face a confusing sequence of coverage phases in a single year — an initial period of cost-sharing, a coverage gap where costs could spike, and only then a catastrophic phase. The new structure collapses that into two numbers a beneficiary can actually plan around: a deductible, and a single out-of-pocket ceiling.
How the $2,400 Cap Works in 2027
The Centers for Medicare & Medicaid Services has set the 2027 Part D out-of-pocket threshold at $2,400, a roughly 14 percent increase over the $2,100 cap in place this year. Once an enrollee’s true out-of-pocket spending on covered drugs reaches that figure, the plan covers the remaining cost of formulary medications for the rest of the calendar year — no coinsurance, no copay, no gap in coverage. The mechanism traces to the 2022 Inflation Reduction Act, which directed Medicare to phase out the old multi-tier structure that could leave some beneficiaries paying a percentage of drug costs indefinitely, with no ceiling at all until the redesign took effect.
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A Higher Deductible Comes First
Before the $2,400 cap ever applies, most Part D plans require enrollees to clear a deductible, and that figure is rising too. CMS set the standard 2027 deductible at $700, up from $615 this year, meaning a larger share of early-year prescription costs lands on the beneficiary before any cost-sharing protection kicks in. Plans are permitted to set a lower deductible or waive it for certain drug tiers, so the amount an individual actually owes before coverage improves still depends on the specific plan chosen during Medicare’s fall enrollment period.
What Counts Toward the Threshold
Not every dollar spent on medication counts the same way toward the $2,400 figure. Under the redesigned benefit, the money that applies toward the threshold includes what a beneficiary pays directly out of pocket plus, for many brand-name drugs, a manufacturer-funded discount applied during the earlier phase of coverage — but not the plan’s monthly premium, which is billed separately and never counts toward the cap. That distinction matters for anyone comparing plans on price alone, since a lower premium does not necessarily mean a faster or slower path to the point where covered drugs stop costing anything.
It also means two enrollees with identical diagnoses can reach the cap at very different points in the year, depending on which plan they chose and which pharmacy they use. A drug covered on a lower formulary tier by one plan but a higher tier by another can change how quickly a household’s spending climbs toward $2,400, even when the underlying prescription and dosage never change.
Why the Number Keeps Climbing
CMS recalculates the threshold each year based on growth in per-enrollee drug spending across the Part D program, which is why it has risen in every year since the redesign took effect — from $2,000 in 2025 to $2,100 in 2026 to $2,400 in 2027. For someone taking a single moderately priced generic, a $300 increase may barely register. For someone on a specialty medication with a list price running into the thousands of dollars a month, reaching that threshold — and the deductible ahead of it — can happen within the first several months of the plan year, according to Kiplinger’s review of the 2027 parameters. What changes for that enrollee is not whether the year’s spending eventually tops out at $2,400, but how quickly the bill arrives and what has to be paid in the meantime.
Reaching the Cap Without a Coverage Plan In Hand
A rising deductible followed by a rising out-of-pocket cap means two separate dollar figures now stand between a Part D enrollee and free covered drugs for the rest of the year, and neither one resets partway through a plan switch. Keeping track of spending against both numbers, particularly for someone managing a specialty prescription or appealing a denied medication, is easy to lose track of in the middle of a diagnosis or a hospital stay.
The Medicare Cost & Coverage Protection Kit is a 10-page kit that breaks down the new Part D out-of-pocket cap by phase and includes a medication and cost tracker for logging spending against it.
See the full breakdown in The Medicare Cost & Coverage Protection Kit.
This article was reported and written with the assistance of AI tools and reviewed by The Financial Wire editorial team.
David M. Keller is a finance writer based in Columbus, Ohio, covering personal finance and consumer-focused economic topics. He earned his degree in journalism from Ohio University and began his career reporting on local business and economic trends for a regional media outlet. Since then, he has contributed to a variety of online publications, focusing on clear, practical coverage of topics such as cost of living, debt, and everyday financial decision-making.
