A two-year federal program that quietly kept a lid on Medicare drug-plan premiums is going away, and the timing means its absence will be felt in the premiums people choose during this fall’s open enrollment. The Centers for Medicare & Medicaid Services confirmed the program will not continue into 2027 as originally scheduled, ending one year earlier than plan sponsors had been told to expect.
The decision does not touch benefits, deductibles or the drug-price negotiation program running alongside it. What it changes is the premium math insurers use to price standalone drug plans, and for a majority of enrollees in those plans, that math now points up rather than flat.
Standalone prescription drug plans, sometimes called PDPs, are the coverage older Americans choose when they have Original Medicare rather than a Medicare Advantage plan with drug coverage built in. Their premiums are set independently by each insurer and have historically swung more from year to year than Medicare Advantage premiums, which is exactly the volatility the stabilization program was built to soften.
What the Premium Stabilization Demonstration Did
The Part D Premium Stabilization Demonstration launched in 2025 as a voluntary program for standalone prescription drug plans, built to smooth out premium swings after the Inflation Reduction Act’s redesign of Part D took effect. CMS paid participating plans a monthly subsidy — $15 per member in 2025 and $10 per member in 2026 — and capped how much a plan’s premium could rise from one year to the next. According to the agency’s own fact sheet, the subsidy lowered the average standalone Part D premium by an estimated $26 a month in 2025 and $16 a month in 2026.
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Why CMS Is Ending the Program a Year Early
CMS announced the wind-down on July 28, 2026, saying plan sponsors now have enough experience under the redesigned Part D benefit to set accurate premium bids without a federal cushion. The Center for Medicare Advocacy, which tracks the program closely, notes that the demonstration was originally expected to run through the 2027 plan year before the agency decided the subsidy was no longer necessary. Ending it removes both the monthly per-member payment and the cap that had limited how far a plan’s premium could jump year over year.
Who Sees a Higher Premium in 2027
Without the demonstration’s cushion, standalone drug plans are setting 2027 premiums on their own, and the early estimates point to widespread increases. KFF’s analysis of the CMS bid data projects that about 75 percent of standalone Part D enrollees will see their premium costs increase for 2027, with roughly 30 percent facing an increase of less than $10 a month and about 45 percent landing in the $11-to-$20-a-month range. The remaining enrollees are projected to see little change or, depending on their specific plan and location, a lower premium.
What Doesn’t Change Alongside It
The end of the subsidy is separate from the deductible and out-of-pocket cap increases also taking effect in 2027, and separate from the drug-price negotiation program moving into its second round that same year. Enrollees comparing standalone drug plans during this fall’s Medicare Open Enrollment will simply be shopping without the price-smoothing effect that shaped 2025 and 2026 premiums, which is why reviewing next year’s plan options rather than assuming automatic renewal carries more weight than in prior years.
Premium increases of the size CMS is projecting are not large enough on their own to trigger most of the low-income assistance programs built into Part D, but they can shift the math for someone weighing whether to switch plans, drop standalone coverage for a Medicare Advantage plan, or apply for Extra Help for the first time. None of those decisions are automatic, and each carries its own deadline tied to Medicare’s enrollment calendar rather than to when the premium notice arrives in the mail.
The Premium Bill Nobody Budgets For
A premium increase that shows up quietly in a plan’s renewal notice is easy to miss until the first payment comes out differently than expected, and a subsidy program ending doesn’t come with a personal letter explaining what changed or what else in a Medicare budget might be affected the same year. The gap between a plan’s advertised premium and what a household actually pays across deductibles, premiums and drug costs is exactly where people fall behind.
The Medicare Cost & Coverage Protection Kit is a 10-page kit covering the new Part D out-of-pocket cap, the prior-authorization appeal steps, and 51 state Medicare cost-help packs for finding local assistance.
Look up the full kit at 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.
