Part D Premium Shock: Why Your Drug Plan Could Cost $20 More Per Month in 2027

Here's a number that should get your attention: 45% of Part D enrollees could see their monthly premiums increase by $11 to $20 starting January 1, 2027.

That's not a typo. Nearly half of everyone with Medicare prescription drug coverage could be looking at an extra $132 to $240 per year in premium costs — and most people have no idea it's coming.

The culprit? A temporary government subsidy called the Part D Premium Stabilization program is expiring at the end of 2026, and when it goes away, millions of beneficiaries will feel the impact immediately.

But here's the good news: you have time to prepare. The Annual Enrollment Period (AEP) runs from October 15 through December 7, 2026 — and this year, it's more critical than ever. Let's walk through exactly what's happening, who will be affected, and what you can do right now to protect yourself.

What Is the Part D Premium Stabilization Subsidy — And Why Is It Ending?

The Part D Premium Stabilization program was a temporary subsidy created as part of the Inflation Reduction Act's sweeping changes to Medicare drug coverage. It was designed to cushion the blow of higher plan costs while drug manufacturers, insurance companies, and the federal government adjusted to new rules.

Think of it as a bridge payment — the government gave Part D plans extra money to keep premiums artificially low during the transition period. That money helped offset the new coverage requirements, the out-of-pocket cap (more on that in a moment), and other structural changes that increased plan costs behind the scenes.

But this subsidy was always meant to be temporary. It was set to expire on December 31, 2026 — and once it's gone, plans will need to charge beneficiaries the actual cost of coverage.

Key Takeaway: The Premium Stabilization subsidy was a short-term fix to smooth the transition to new Part D rules. When it expires at the end of 2026, premiums will rise to reflect the real cost of your drug coverage.

Who Will Be Hit the Hardest?

Not everyone will see the same impact. According to CMS estimates and independent analyses:

• 45% of Part D enrollees could see monthly premium increases between $11 and $20
• Standalone Part D plans (PDPs) are expected to see larger increases than Medicare Advantage prescription drug plans (MA-PDs)
• Plans with richer coverage — those covering more expensive medications or offering lower out-of-pocket costs — will likely see the steepest premium hikes
• Low-income beneficiaries who receive Extra Help (also called the Low-Income Subsidy) will generally be protected, as the subsidy covers most or all of their premiums

If you're currently paying a lower premium for your Part D coverage — especially if you're in a standalone drug plan — there's a good chance you'll be among the 45% who see an increase.

Key Takeaway: The premium shock will hit standalone Part D plans harder, especially those with comprehensive coverage. If you're not receiving Extra Help, you should expect to pay more starting in January 2027.

Why This AEP (October 15 - December 7, 2026) Is More Critical Than Ever

The Annual Enrollment Period happens every fall, and it's your chance to review and change your Medicare coverage for the upcoming year. But this year isn't like other years.

Here's why this AEP is absolutely crucial:

1. You'll receive your Annual Notice of Change (ANOC) by September 30, 2026
Every Part D plan must mail you an ANOC by the end of September. This document will spell out exactly how your plan is changing for 2027 — including your new premium. Read it carefully.

2. Your current "low-premium" plan might not be the best deal anymore
If your plan's premium is jumping significantly, it might no longer be the most cost-effective option for your medications. A plan that was a great value in 2026 could become one of the most expensive options in 2027.

3. You only get one shot to make changes
The AEP window closes on December 7, 2026. If you miss it, you're generally locked into your plan for the entire year unless you qualify for a Special Enrollment Period.

4. The stakes are higher with other 2027 changes in play
The premium increase isn't the only change happening. Deductibles are rising, out-of-pocket caps are shifting, and drug formularies (the list of covered medications) could be completely different. You need to evaluate the whole picture.

Key Takeaway: This isn't a year to coast on autopilot. The combination of the expiring subsidy and other Medicare changes makes this one of the most important AEPs in recent memory.

How to Prepare and Review Your Plan

Don't wait until November to think about this. Start preparing now:

Step 1: Know Your Current Costs
Pull out your current plan documents and calculate what you're actually paying:
• Monthly premium
• Annual deductible
• Copays for each of your medications
• Total out-of-pocket spending so far this year

Step 2: Make a List of Your Medications
Write down every prescription you take regularly, including:
• Drug name and dosage
• How often you fill it (monthly, every 90 days, etc.)
• Whether it's a brand-name or generic

Step 3: Watch for Your ANOC in Late September
Your Annual Notice of Change will arrive by September 30, 2026. Look for:
• Your new 2027 premium
• Changes to your deductible
• Changes to drug coverage or formulary
• New restrictions or prior authorization requirements

Step 4: Use Medicare's Plan Finder Tool During AEP
Once the AEP opens on October 15, go to Medicare.gov/plan-compare and enter your medications. The tool will show you:
• All available plans in your area
• Total estimated annual cost for each plan (premium + deductible + drug costs)
• Which pharmacies are in-network
• Star ratings for plan quality

Step 5: Don't Just Look at the Premium
A plan with a $15 premium might look cheaper than one with a $30 premium — but if the first plan charges you $100 more per month in copays, it's actually the more expensive option. Always compare total annual cost, not just the premium.

Step 6: Consider Talking to a Licensed Agent
Medicare plan comparisons can get complicated fast, especially with multiple medications or chronic conditions. A licensed agent can walk you through your options at no cost to you.

Key Takeaway: Preparation is everything. Start gathering your information now so you're ready to make an informed decision the moment AEP opens.

The Other 2027 Changes You Need to Know About

The expiring Premium Stabilization subsidy isn't happening in a vacuum. Several other significant changes are taking effect on January 1, 2027, and they'll all interact with each other.

The Part D Out-of-Pocket Cap Is Increasing
In 2026, the out-of-pocket maximum for Part D is capped at $2,100. In 2027, that cap rises to $2,400.

Once you hit that cap, you pay nothing for covered drugs for the rest of the year. But getting to that cap will cost you $300 more.

The Part D Deductible Is Rising
The standard Part D deductible is increasing from $615 in 2026 to $700 in 2027. Not all plans charge the full deductible, but many do — and if yours does, that's an extra $85 you'll pay before coverage kicks in.

Medicare Negotiated Drug Prices Are Expanding
The Inflation Reduction Act gave Medicare the power to negotiate drug prices directly with manufacturers. In 2026, 10 drugs were subject to negotiated pricing. In 2027, that expands to 15 additional medications.

If you take one of those newly negotiated drugs, your costs could actually go down — even if your premium goes up. This is another reason to review your specific situation during AEP rather than making assumptions.

Key Takeaway: The premium increase is just one piece of a much larger puzzle. The only way to know your true 2027 costs is to run the numbers on your specific medications and compare plans.

What If You Receive Extra Help?

If you qualify for Medicare's Extra Help program (also called the Low-Income Subsidy or LIS), you're largely insulated from these premium increases. Extra Help pays for most or all of your Part D premiums, deductibles, and copays.

However, you should still review your plan during AEP to make sure:
• Your medications are still covered
• You're in a plan that qualifies for Extra Help (called a "benchmark plan")
• You're not paying more than you need to in copays

Even with Extra Help, the wrong plan could cost you more than necessary.

The Bottom Line: Don't Wait Until December

Here's the reality: most people don't review their Medicare coverage every year. They stick with the same plan out of habit, assume everything will stay the same, and only realize there's a problem when they go to fill a prescription in January.

This is not the year to do that.

With 45% of Part D enrollees facing premium increases of $11 to $20 per month, the expiring Premium Stabilization subsidy is a wake-up call. Combined with the rising deductible, higher out-of-pocket cap, and changing drug formularies, 2027 is shaping up to be one of the most significant shifts in Medicare drug coverage in years.

The good news? You have the tools, the time, and the resources to make a smart decision. Your Annual Notice of Change will arrive by September 30. The Annual Enrollment Period runs from October 15 through December 7. And if you need help navigating your options, there are licensed professionals ready to assist you at no cost.

Don't let this premium shock catch you off guard. Start preparing now, review your options carefully during AEP, and make sure you're in the right plan for 2027.