Why Your Part D Drug Premium May Jump in 2027

Your plan's Annual Notice of Change shows what your drug premium will be in 2027.

If you have been dreading the envelope from your drug plan this fall, you are not alone. When it arrives, the first thing worth finding is one line: your plan's 2027 monthly premium, set beside what you pay today. The reason traces back to a federal program that stops after this year.

Changes will not land the same way everywhere. In a September forum thread about 2027 premiums, one enrollee put it plainly: "It depends on the state, of course, but many people will see increases." Others were still waiting. A member in Pennsylvania had no notice yet for either their own drug plan or their spouse's.

Your plan letter also explains how you pay for each prescription as the year goes on. Medicare's own guide to drug costs explains that most plans move you through three stages: a deductible, then a stretch where you pay 25% coinsurance on generic and brand-name drugs, then catastrophic coverage. In that last stage, you pay nothing more for covered drugs for the rest of the year. The same guide adds a caution worth keeping close: "You may have to pay more, depending on your income."

I like to treat a plan letter as a bill I have not agreed to yet. Before you decide anything, it helps to know what was holding your price down in the first place.

What was the Part D Premium Stabilization Demonstration, and why is it ending?

For two years, a temporary federal subsidy held down stand-alone drug plan premiums. That help, the Part D Premium Stabilization Demonstration, ends after the 2026 plan year.

The change matters most to you if these describe your situation:

• You have Original Medicare with a separate, stand-alone drug plan.
• You pay your own premium without Extra Help, the federal program that helps people with limited income pay drug costs.
• You were planning to let your current plan renew for 2027 without comparing.

Money explains the stakes. The program was expected to pay participating plan sponsors about $3.6 billion in 2026, after about $6.2 billion in 2025. Federal estimates suggested that without it, average 2025 premiums would nearly have doubled for people who did not get the low-income subsidy.

In its 2025 fact sheet, CMS laid out how the first year worked. There was a $15 cut to the base beneficiary premium (the national starting number each plan's basic premium is built from). There was a $35 limit on how much a plan's total premium could rise from one year to the next. And there were narrowed risk corridors, a safety net that shared unexpected losses with insurers. For 2026, the agency shrank the cut to $10, loosened the limit to $50 and dropped the narrowed corridors. In practice, the help was already being turned down.

Then came July 28, 2026. CMS announced it would discontinue the demonstration at the end of 2026 "to return the program to operating under traditional market conditions in CY 2027." Its bid analysis, the agency said, showed plan sponsors "had sufficient experience under the redesigned Part D benefit." Earlier federal planning had pointed to a third year, through 2027, so the end came sooner than many people expected.

An analysis of 4 sources (two CMS fact sheets, a congressional research report and national news reporting) shows one steady pattern. The support was built to shrink, and now it is gone.

The common assumption is that a legal cap still protects your premium. The Inflation Reduction Act does limit growth in the national base premium to 6% a year through 2029. But CMS calls that base only "the starting point for calculating a plan-specific basic Part D premium." That plan premium comes on top of your Part B premium, which CMS set at $202.90 a month for 2026, so any change lands in your total monthly Medicare bill.

Plans were always allowed to change. A congressional research report noted in 2023 that because sponsors can change offerings from year to year, beneficiaries face "the need for careful review of their choices" every year. In 2022, 47% of Part D enrollees were in stand-alone plans, the group this decision touches most.

I often think about what a higher premium means next to everything else a household pays. On our team, one advocate in Ohio stayed with a patient from early February until she was approved for a new apartment, with a May 1st move-in. That same patient follow-through is what a Part D change deserves. Our guide to every Medicare change for 2027, sorted by deadline shows what happens on its own and what needs you by December 7. Which brings us to the number CMS keeps repeating: the national average.

If the average barely moves, why could your own premium jump?

In short: If the average barely moves, why could your own premium jump?: The national average blends many plans into one number.

The national average blends many plans into one number. In 2027 some plans will cost less, some will hold steady, and a few may climb by tens of dollars a month.

Start with the official picture, because it is genuinely calm. According to CMS projections released at the end of September, the average stand-alone drug plan premium is expected to rise by less than $1, from $35.09 a month in 2026 to $36 in 2027. Drug coverage inside Medicare Advantage is projected to fall about 38%, from $11.32 to $7. CMS also says 93% of people without low-income help will be able to find an enhanced Part D plan for less than $6 a month.

Those are real numbers. They are also averages.

Here is what enrollees started posting in September, as their plan letters arrived. In a public Medicare forum, one person wrote that a sister's enhanced "Preferred" plan in New York was going from $163.70 to $238.30 a month. That is $74.60 more every month for the same kind of coverage. A member in New Jersey reported a basic plan rising from $4.40 to $28.30. Someone in Texas watched a plan that had cost $0 move to $5.30.

Not every change pointed up. Members in Indiana and California described the same low-cost plan dropping to $5.30, from $8.60 and $5.70. One of them added a warning worth repeating: "Read the notice carefully." The way that plan's drug tiers worked had changed too.

KFF's analysis of 2026 enrollment helps explain why stand-alone plan members feel this most. Nearly 8 in 10 Medicare Advantage drug plan members without low-income help paid no monthly drug premium in 2026, compared with about 3 in 10 stand-alone plan members in zero-premium plans. KFF tied that gap to rebate dollars Advantage plans can use to lower premiums, which stand-alone plans do not get. In June, KFF also wrote that the stabilization program "continues to work as intended to help stabilize PDP premiums." That support is the piece going away.

So what does this mean for you? One question settles it for your household: if I keep this exact plan, what will I pay each month in 2027? Look for that figure in your Annual Notice of Change, and ask your plan whether each of your drugs keeps the same tier next year. It may feel tempting to move to an Advantage plan for the lower drug premium. Before you do, it can help to read why half the doctors in your Advantage plan may not see you, because networks change the math. I would rather you start with the document already sitting in your mailbox, and the few lines in it that reveal a jump well before January does.

What should you check in your Annual Notice of Change before December 7?

Check your plan's 2027 premium, its deductible and every drug you take. Then compare plans using your own prescriptions, and make any switch between October 15 and December 7.

Your Annual Notice of Change, often called the ANOC, is the letter your drug plan sends each fall. It lists what will be different for next year. Many people set it aside unopened, and that is completely understandable. It is dense. Here is the order I would read it in.

1. Find the 2027 premium and deductible. Medicare.gov notes that no drug plan may charge a deductible above $700 in 2027, up from $615 in 2026, and some plans have none. The premium is owed every month whether you fill a prescription or not.
2. Look up each drug by name. Confirm it is still on the plan's drug list, called the formulary, and note whether its tier moved. A tier change can raise what you pay at the pharmacy even when the premium falls.
3. Enter every medication into Medicare Plan Finder. Once your drugs are in, the tool on Medicare.gov shows estimated costs for each plan, premiums and copays together.
4. Compare totals, then decide. If another plan costs less for your exact drugs, you can switch during open enrollment. If your current plan still comes out ahead, you can let it renew.

Step three trips people up more than any other. In a 2024 Reddit thread about Part D shopping, one member explained they had been on Medicare.gov for a while before realizing the drugs had to be entered before plans would show. Another replied, "It's weird and confusing for most people, including me. It's not just you." That exchange was about the 2024 plan year, and it still rings true. The same commenter added a reminder I would underline twice: "And then do it again every year."

One caution belongs here. If a higher premium makes you think about dropping drug coverage altogether, pause first. Going 63 or more days in a row without Part D or other creditable drug coverage can add a permanent late enrollment penalty to your premium. A 14-month gap, for example, adds 14% for as long as you have Medicare drug coverage.

Some readers will look at Medicare Advantage instead. In a 2025 forum discussion, members weighed the lower upfront cost of Advantage plans against network limits and prior authorization, the extra sign-off a plan can require before it pays. Neither path is right for everyone. For the fuller policy backstory, our guide on what the end of Part D price stabilization means for 2027 walks through it. What I would not do is let December 8 arrive with the letter still sealed, since after that, changes are generally allowed only in special circumstances.

Where does this leave your 2027 drug plan decision?

In short: Your 2027 decision comes down to one comparison: your current plan's new premium and drug costs against at least one other plan.

Your 2027 decision comes down to one comparison: your current plan's new premium and drug costs against at least one other plan. Reading your plan letter now leaves time to compare and switch.

Before you choose, I'd ask yourself one honest question: which costs your household more, a higher monthly premium or higher prices at the pharmacy counter? If you are weighing Medicare Advantage too, one forum commenter noted that many of those plans charge no premium beyond the Part B cost, include Part D and cap yearly out-of-pocket spending, so price one beside your current plan. You can make this choice at your own pace, as long as you make it before December 7.

One commenter in a September forum thread offered a reason enhanced plans may climb fastest: "They go up a lot given that folks get those plans for the expensive drug coverage." So the people leaning hardest on their drug coverage may be the ones with the most reason to compare.

It is normal to feel worn out by another round of paperwork. Still, a New Jersey enrollee in that same thread called it "very important to shop plans beginning next month." That month is here, and your letter may already be sitting on the kitchen counter.