CMS Ends Part D Premium Stabilization Demo for 2027

CMS to Wind Down Part D Premium Support Program

The Centers for Medicare & Medicaid Services (CMS) has announced it will end the Part D Premium Stabilization Demonstration, a program that has helped keep Medicare Part D premiums in check since it took effect last year, according to Healthcare Dive. CMS says the demonstration is no longer needed, but at least one researcher cited in the report cautioned that some Part D enrollees could see steeper premium increases in 2027 as a result.

For the roughly 50 million Medicare beneficiaries who rely on a standalone Part D plan or a Medicare Advantage plan with drug coverage, this is a development worth watching closely as the 2027 plan year approaches. Premium and benefit changes tied to Part D typically become visible to enrollees during the Medicare Annual Enrollment Period (AEP), which runs from October 15 to December 7 each year.

Why CMS Created the Subsidy in the First Place

The Part D Premium Stabilization Demonstration was introduced as insurers adjusted to major structural changes in the Medicare drug benefit brought on by the Inflation Reduction Act (IRA), including the new $2,000 annual out-of-pocket cap on covered drugs and the elimination of the old coverage gap ("donut hole"). Those changes shifted more financial risk onto plan sponsors, and CMS built the demonstration to help cushion the transition and prevent sharp, disruptive premium spikes that could have pushed enrollees out of Part D coverage altogether.

Now, CMS is signaling that the drug plan market has adjusted enough that the extra support is no longer necessary. That's a reasonable read if premiums and plan participation have genuinely stabilized. But it also means the cushion that has been absorbing some of the cost pressure from the redesigned benefit will no longer be there heading into 2027.

According to the source reporting, a researcher flagged this exact concern: without the demonstration's support, some Part D plans could pass along higher costs to enrollees through premium increases next year. It's important to note this is characterized as a researcher's assessment of possible impact, not a confirmed CMS projection or a finalized 2027 premium figure. CMS has not yet released 2027 Part D premium and plan data, which typically comes out closer to the fall AEP announcement season.

What This Means for Medicare Enrollees

If you currently have a standalone Part D plan or a Medicare Advantage plan with built-in drug coverage (MAPD), here's how this development could affect your decisions this fall:

• Don't assume your current plan's premium will stay the same. Even in years without major policy shifts, Part D premiums and formularies change annually. With a support program ending, it's especially important to review your Annual Notice of Change (ANOC) letter closely when it arrives in September.
• Compare plans during AEP rather than auto-renewing. If your current plan's premium rises for 2027, a different Part D or Medicare Advantage plan in your area may offer better value for the specific medications you take. Use Medicare's plan comparison tools or work with a licensed agent to check your options.
• Check whether you qualify for Extra Help. The Low-Income Subsidy (LIS), also known as Extra Help, can significantly reduce or eliminate Part D premiums and cost-sharing for beneficiaries who meet income and asset limits. If your income has changed, it's worth checking eligibility even if you didn't qualify in the past.
• Factor in your total drug costs, not just the premium. A slightly higher premium on a plan with better formulary coverage for your specific prescriptions can still cost less overall than a cheaper plan with higher copays or coinsurance for the drugs you actually take.
• Watch for CMS's fall announcements. CMS typically releases national average Part D premium estimates and plan-specific details before AEP begins. Until then, any specific premium figures for 2027 should be treated as preliminary or researcher estimates rather than confirmed numbers.

The bottom line: this is a policy and market-structure story now, but it will become a personal budgeting story for many enrollees once 2027 plan details are released. Medicare Plan Path will continue tracking CMS announcements on Part D premiums and plan availability as more concrete 2027 figures become available. In the meantime, the most useful step readers can take is to mark their calendar for AEP and plan to actively compare drug plan options rather than letting current coverage renew automatically.