The Medicare Part D premium 2027 just became clearer, and for many of the 25 million people enrolled in a standalone drug plan, the news is not great. CMS confirmed on July 28, 2026 that the national base beneficiary premium is rising to $41.33 a month, up from $38.99 in 2026, while a temporary subsidy that had been softening premiums for the past two years is going away entirely. At the same time, the Part D deductible is climbing to $700 and the annual out-of-pocket cap is rising to $2,400, meaning higher-need beneficiaries will pay more before hitting the point where covered drugs cost nothing for the rest of the year. We’ll be updating this article monthly as CMS releases new figures ahead of Medicare Open Enrollment.
What makes 2027 different is the disappearance of the Part D Premium Stabilization Demonstration, a program that quietly knocked $15 off many standalone premiums in 2025 and $10 in 2026. CMS Administrator Dr. Mehmet Oz has called the subsidy an insurer bailout that plans no longer need, and the agency projects most Medicare recipients will see an increase of less than $10 a month, with some plans even coming down. That is a projection, not a guarantee, and the real plan-by-plan premiums will not be public until CMS releases its full 2027 landscape file, expected in the second half of September, just before Open Enrollment opens on October 15.
Key Highlights: Medicare Part D Changes for 2027
| Detail | 2026 | 2027 |
|---|---|---|
| Base beneficiary premium | $38.99 | $41.33 |
| National average monthly bid amount (NAMBA) | $239.27 | $296.05 |
| Annual deductible | $615 | $700 |
| Out-of-pocket spending cap | $2,100 | $2,400 |
| Premium Stabilization Demonstration support | Up to $10/month | Ended |
| Full plan-by-plan premiums published | September 2025 | Mid to late September 2026 |
| Open Enrollment window | Oct 15 to Dec 7, 2025 | Oct 15 to Dec 7, 2026 |
What Is Actually Changing in the Medicare Part D Premium 2027?
Three separate things are happening at once, and conflating them is where most confusion starts. First, the national base beneficiary premium is a statutory benchmark used to calculate each plan’s basic premium, not a bill anyone actually receives; it rose from $38.99 to $41.33, a 6% increase, which is the maximum allowed under the Inflation Reduction Act’s cap through 2029. Second, the national average monthly bid amount, an enrollment-weighted average of what insurers bid to provide basic coverage, jumped about 24% to $296.05, reflecting rising drug costs and the end of extra government support. Third, and most consequential for people currently enrolled in a standalone Prescription Drug Plan, the temporary subsidy that reduced many premiums in 2025 and 2026 will simply not exist in 2027.
None of these three figures is the number that will show up on your bill. Your actual 2027 Part D premium depends on the specific plan you choose, where you live, and that plan’s own bid, all of which become public once CMS posts the final landscape file.
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New Part D Deductible and Out-of-Pocket Cap for 2027
Under the Inflation Reduction Act’s redesigned benefit, Part D no longer has the old multi-phase structure with the notorious coverage gap. Instead, beneficiaries move through a deductible, then cost-sharing, until they hit a hard annual cap, after which covered drugs are free for the rest of the year. For 2027, CMS has finalized the Part D deductible at $700, up from $615 in 2026, and the annual out-of-pocket cap at $2,400, up from $2,100. Once a beneficiary’s true out-of-pocket spending on covered drugs reaches that cap, including the deductible, they pay nothing more for the remainder of the plan year.
These two figures are confirmed by CMS and will not change. They apply regardless of which specific plan a person chooses, whether a standalone Prescription Drug Plan or a Medicare Advantage plan that includes drug coverage.
IRMAA: The Income-Related Surcharge on Top of Your Premium
Higher-income beneficiaries pay an additional monthly surcharge called the Income-Related Monthly Adjustment Amount, or IRMAA, on top of whatever their plan charges. IRMAA is based on your Modified Adjusted Gross Income from two years earlier, so your 2027 surcharge will be based on your 2025 tax return. CMS and the Social Security Administration will not confirm the official 2027 IRMAA brackets until around mid-November 2026, so any 2027 dollar figures circulating now are projections, not final numbers. The table below shows the most recently confirmed brackets, for 2026, which give the clearest picture of the surcharge structure while the 2027 version is finalized.
| Tier | Single filer MAGI (2024 income) | Married filing jointly MAGI | Part D surcharge per month |
|---|---|---|---|
| Standard | Up to $109,000 | Up to $218,000 | $0 |
| Tier 1 | $109,000 to $137,000 | $218,000 to $274,000 | $14.50 |
| Tier 2 | $137,000 to $171,000 | $274,000 to $342,000 | $37.50 |
| Tier 3 | $171,000 to $205,000 | $342,000 to $410,000 | $60.40 |
| Tier 4 | $205,000 to $500,000 | $410,000 to $750,000 | $83.30 |
| Tier 5 | Above $500,000 | Above $750,000 | $91.00 |
These are the confirmed 2026 brackets, based on 2024 income. The 2027 brackets will use 2025 income and are expected to rise only modestly for inflation once CMS and the Social Security Administration finalize them in November 2026. IRMAA is charged per Medicare enrollee, so a married couple who are both enrolled each pay the full surcharge for their tier.
Free Calculator: Estimate Your Total Monthly Part D Cost
Medicare Part D Premium Calculator
Free Calculator: Estimate Your Total Monthly Part D Cost
How to Apply and Enroll in a Part D Plan
New Medicare beneficiaries can enroll in a Part D plan during their Initial Enrollment Period, which runs seven months around their 65th birthday. Existing beneficiaries who want to switch plans for 2027 do so during the annual Medicare Open Enrollment period, from October 15 through December 7, 2026, with changes taking effect January 1, 2027. Enrollment can be completed online through Medicare’s plan finder tool, by phone, or with help from a State Health Insurance Assistance Program counselor.
Processing Time
Plan changes made during Open Enrollment take effect automatically on January 1 of the following year; no separate approval process is required once you submit your selection. If you are newly eligible for Medicare, coverage typically begins the month tied to your Initial Enrollment Period, and confirmation is usually mailed within a few weeks of enrolling.
Payment Schedule
Most people have their Part D premium deducted automatically from their monthly Social Security payment, the same way Part B premiums are handled. Beneficiaries who are not yet collecting Social Security, or who prefer to pay directly, receive a quarterly or monthly bill from their plan and can typically pay online, by mail, or through automatic bank withdrawal.
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Why Premiums Are Rising: The End of the Subsidy Program
The Part D Premium Stabilization Demonstration was introduced in 2025 specifically to cushion the market after the Inflation Reduction Act’s benefit redesign shifted more financial risk onto insurers. It reduced many standalone plan premiums by an estimated $15 a month in 2025 and $10 a month in 2026. CMS’s review of 2027 bid data concluded that plan sponsors now have enough experience pricing the redesigned benefit that the extra support is no longer necessary, and the agency is returning the market to standard conditions for 2027. Critics, including health policy researchers at KFF, have warned that some standalone plan enrollees could see a steeper premium jump than in recent years now that the cushion is gone, even though CMS projects the average increase will stay under $10 a month.
Official Medicare Resources and Links
| Resource | Purpose | Link |
|---|---|---|
| Medicare Plan Finder | Compare 2027 Part D and Medicare Advantage plans, check premiums | medicare.gov/plan-compare |
| Medicare.gov login (MyMedicare account) | View claims, manage coverage, update information | medicare.gov/account/login |
| CMS Part D landscape and rate data | Official 2027 premium and bid information | cms.gov Part D 2027 fact sheet |
| Social Security IRMAA information | Check or appeal your income-related surcharge | ssa.gov/medicare/lower-costs |
| State Health Insurance Assistance Program (SHIP) | Free, unbiased Medicare counseling by state | shiphelp.org |
FAQs
How much is the Medicare Part D premium for 2027?
The national base beneficiary premium for 2027 is $41.33 a month, up from $38.99 in 2026. This is a benchmark figure, not what every enrollee pays; your actual plan premium depends on your specific plan and will be published in CMS’s 2027 landscape file in September 2026.
Why is my Part D premium going up in 2027?
A temporary federal subsidy that had been lowering many standalone drug plan premiums by $10 to $15 a month is ending after 2026. Combined with a rising national average bid amount, this means many plans are expected to cost more in 2027, though CMS projects most people will see an increase of less than $10 a month.
What is the Part D deductible for 2027?
The 2027 Part D deductible is $700, up from $615 in 2026. This is the amount you pay out of pocket for covered drugs before your plan’s cost-sharing begins, and it counts toward your annual out-of-pocket cap.
What is the Part D out-of-pocket maximum for 2027?
The 2027 annual out-of-pocket cap is $2,400, up from $2,100 in 2026. Once your true out-of-pocket spending on covered drugs reaches this amount, you pay nothing more for those drugs for the rest of the calendar year.
When will I know my exact 2027 Part D premium?
CMS is scheduled to release the complete 2027 Medicare Advantage and Part D landscape file, with plan-by-plan premiums, in mid to late September 2026. Current plan holders will also receive an Annual Notice of Change letter in late September detailing how their specific plan is changing.
What is IRMAA and does it apply to Part D?
IRMAA, the Income-Related Monthly Adjustment Amount, is a surcharge added to both Medicare Part B and Part D premiums for higher-income beneficiaries, based on your Modified Adjusted Gross Income from two years earlier. It applies whether you have a standalone Part D plan or a Medicare Advantage plan with drug coverage built in.
Can I switch Part D plans for 2027?
Yes. Medicare Open Enrollment runs from October 15 through December 7, 2026, and any plan change made during that window takes effect January 1, 2027. Outside of that period, switching is generally limited to specific qualifying situations.
Is the Part D premium deducted from Social Security automatically?
For most beneficiaries who are already collecting Social Security, yes, the Part D premium is withheld automatically each month. Those not yet collecting Social Security are billed directly by their plan.
Conclusion
The Medicare Part D premium for 2027 is rising for a specific, confirmed reason: the temporary subsidy that had been holding standalone plan premiums down since 2025 is ending, on top of a statutory 6% increase in the national base beneficiary premium to $41.33. The deductible and out-of-pocket cap are also increasing, to $700 and $2,400. What remains unknown until CMS publishes its full landscape file in September is the actual premium for any specific plan, so the smartest move for most beneficiaries is to wait for that release, review the Annual Notice of Change from their current plan, and compare options during Open Enrollment from October 15 through December 7. We’ll keep updating this page with the final 2027 numbers as soon as CMS makes them public.
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