For two years there has been a federal cushion sitting underneath your parent's standalone Medicare drug plan premium. Ten dollars a month of it in 2026. Fifteen the year before that. Almost nobody who has one knows it is there, which means almost nobody is going to notice the moment it is gone.
It goes away December 31.
I spent eight years buying houses from families in transition, and the thing that surprised me every single time was what actually broke a household budget. It was almost never the mortgage. It was the drip. A drug plan that moved, a supplement that moved, three small increases in the same January that nobody added up until the checking account started running out four days early. By the time a family called somebody like me, the house had become the answer to a problem that started somewhere else entirely.
So here is the part worth your attention right now, in the first week of September. Your parent is about to receive the single most useful piece of mail they will get all year, and if your family is like most families, it is going to sit unopened on the counter next to the grocery flyers until somebody throws it out.
It is called the Annual Notice of Change. It is boring. It is roughly the same shade of beige as everything else the plan sends. And for 2027 in particular, it is the only document that will tell you what your parent is actually going to pay.
You do not need to become a Medicare expert to handle this well. You need to know what changed, which three lines in that letter matter, and what the deadline is. That is genuinely all of it.
What CMS Announced, and Why It Is Bigger Than It Sounds
On July 28, 2026, the Centers for Medicare and Medicaid Services released its preliminary Part D bid information for 2027 and announced something it had not announced before: the Part D Premium Stabilization Demonstration is over.
That demonstration started in 2025. It was voluntary, and it applied to standalone prescription drug plans, the kind your parent has if they are on Original Medicare with a separate drug plan. For plans that opted in, CMS knocked a flat amount off the base beneficiary premium and capped how far a plan could raise its total Part D premium from one year to the next.
Per the CMS fact sheet on the 2026 demonstration parameters, the reduction was $15 a month in 2025 and $10 a month in 2026, and for 2026 CMS raised the year-over-year premium increase limit from $35 to $50. In its July 28 announcement, CMS wrote that plan sponsors now have "sufficient experience under the redesigned Part D benefit" and that it will discontinue the demonstration at the end of 2026 to return the program to traditional market conditions.
Now the numbers underneath it. According to CMS, the national average monthly bid amount for Part D, which is essentially what the plans themselves say the coverage costs, was $239.27 for 2026. For 2027 it is $296.05. That is a jump of close to 24 percent in a single year.
The base beneficiary premium, meanwhile, went from $38.99 to $41.33. That is 6 percent.
Those two numbers do not match, and the reason they do not match is written directly into the CMS announcement. Under the Inflation Reduction Act formula, the base premium is the lesser of two calculations: last year's base increased by 6 percent, or a figure derived from the actual bids. CMS shows its work on the page. Calculation A came to $41.33. Calculation B came to $94.06.
The 6 percent cap is doing an enormous amount of work right now. It is holding the base premium at less than half of what the bids alone would produce.
What This Actually Means for Your Family
Here is where families get this wrong, and it is an easy mistake to make, because "base premium rose 6 percent" sounds like reassuring news.
The base premium is not the premium
The base beneficiary premium is a starting point, not a price tag. CMS spells out in the same July 28 announcement that what an enrollee actually pays is that base, adjusted by the difference between their specific plan's standardized bid and the national average bid, plus any supplemental premium, plus any late enrollment penalty, minus rebates in the case of a Medicare Advantage drug plan, minus the low-income subsidy if your parent qualifies for it.
Read that first adjustment again, because it is the one that matters. If your parent's plan bids above the national average, that difference lands on your parent. And that difference is not subject to the 6 percent cap. The cap applies to the base. It does not apply to the gap between what one particular plan charges and what the average plan charges.
So you have a year where the average bid moved about 24 percent, the base premium was statutorily held to 6 percent, and the demonstration that was smoothing the difference for participating standalone plans is ending. Those three facts sitting together are why this year is worth ten minutes of your attention instead of the usual zero.
Standalone drug plans carry this. Most Medicare Advantage plans do not.
This is the distinction that decides whether your family needs to care at all.
The demonstration applied to standalone prescription drug plans. If your parent has Original Medicare plus a separate Part D plan, they are in the group this affects most directly. If your parent has a Medicare Advantage plan that includes drug coverage, the plan can use its rebate dollars to buy down the Part D portion of the premium, which is a lever standalone plans simply do not have.
That does not mean Medicare Advantage enrollees get to skip open enrollment. Networks change, drug lists change, and supplemental benefits change every January. It means the specific pressure described here lands hardest on standalone drug plans.
The deductible and the out-of-pocket cap moved too
Both of these appear in your parent's Annual Notice of Change, and both are going up.
In the CY 2027 Rate Announcement, CMS published the updated Part D benefit parameters. The defined standard deductible goes from $615 in 2026 to $700 in 2027. The annual out-of-pocket threshold, the cap that stops your parent's drug spending for the year, goes from $2,100 to $2,400.
The cap is still the best thing that has happened to Part D in a generation, and it is worth saying plainly that a $2,400 ceiling is a very different world than the one your parents' generation started in. But it is $300 higher than this year, and if your parent is somebody who reliably hits that cap, that is a real $300, plus $85 more at the front end on the deductible.
Nobody can tell you your parent's number yet
This is the honest part, and it is the reason this post is a heads-up rather than a calculation.
CMS has not released plan-level 2027 premiums. In the July 28 announcement, the agency said the 2027 Medicare Advantage and Part D landscape, with final average premiums and the actual plan-by-plan detail, arrives in mid-to-late September.
So anybody telling you in the first week of September exactly what your parent's 2027 drug plan will cost is guessing. What you can do right now is make sure the letter that carries the real answer does not get thrown away.
What To Do Between Now and December 7
Step 1: Find the letter before your parent files it
Federal rules give you a firm date to work with. Under 42 CFR 422.111(d)(2), a plan has to notify enrollees of changes taking effect January 1 at least 15 days before the annual coordinated election period begins. That period starts October 15 under 42 CFR 422.62(a)(2)(iii). Fifteen days before October 15 is September 30.
Medicare.gov describes the Annual Notice of Change simply: it comes from the plan in September, and it covers changes in coverage and costs that take effect in January.
Call your parent in the next two weeks and ask them to set aside anything that arrives from their drug plan. Not to read it. Just to not throw it away.
Step 2: Read exactly three lines
You are not reading the whole document. You are looking for three things, and the ANOC is built to show this year against next year side by side.
The monthly premium. The annual deductible. And whether your parent's specific medications are still on the plan's drug list at the same tier.
That is it. Three lines. Ten minutes.
Step 3: Wait for the landscape, then compare
Once CMS publishes the 2027 landscape in mid-to-late September, the Plan Finder at Medicare.gov will let you enter your parent's actual prescriptions and compare what each available plan would cost them for the year, not just the monthly premium.
A plan with a higher premium and better coverage of one expensive drug can easily beat a cheaper plan. Premium alone is the wrong comparison, and it is the comparison almost everybody makes.
Step 4: Check the drug list, not just the price
A formulary change is quieter than a premium change and often costs more. A medication that moves from a preferred tier to a non-preferred tier, or off the list entirely, can undo every dollar you saved shopping on premium.
If your parent takes anything expensive or hard to substitute, that drug is the thing you are actually shopping for.
Step 5: Decide by December 7, or the decision gets made for you
The annual election period runs October 15 through December 7. If your family does nothing, your parent is generally rolled into their current plan's 2027 version at its 2027 price, whatever that turns out to be. Doing nothing is a choice, and in a year like this one, it is a choice worth making on purpose rather than by default.
Frequently Asked Questions
Why is my parent's Medicare drug plan premium going up in 2027?
Two things are happening at once. CMS announced on July 28, 2026 that it is ending the Part D Premium Stabilization Demonstration after December 31, which removes a $10 monthly reduction and a $50 limit on yearly premium increases for participating standalone plans. Separately, the national average monthly bid amount rose from $239.27 for 2026 to $296.05 for 2027, close to a 24 percent increase, while the base beneficiary premium was held to 6 percent by the Inflation Reduction Act formula.
What is the Annual Notice of Change and when does it arrive?
The Annual Notice of Change, or ANOC, is the letter your parent's Medicare drug or health plan sends every fall showing what changes in January. Medicare.gov states it arrives in September and covers changes in coverage and costs effective in January. Under 42 CFR 422.111(d)(2), plans must send it at least 15 days before the annual election period opens on October 15, which puts the deadline at September 30.
Is the Part D deductible going up in 2027?
Yes. In the CY 2027 Rate Announcement, CMS published a defined standard deductible of $700 for 2027 against $615 for 2026. The annual out-of-pocket threshold, which caps what your parent spends on covered drugs for the year, rises from $2,100 to $2,400. Both figures appear in the Annual Notice of Change.
Does this affect Medicare Advantage plans that include drug coverage?
Less directly. The Premium Stabilization Demonstration applied to standalone prescription drug plans, and Medicare Advantage plans with drug coverage can apply rebate dollars to reduce the Part D portion of the premium, an option standalone plans do not have. Medicare Advantage enrollees should still review the ANOC, because networks, drug lists, and supplemental benefits change every January.
What happens if my parent does nothing during open enrollment?
They are generally enrolled in their current plan's 2027 version at its 2027 premium, deductible, and drug list. The annual election period runs October 15 through December 7 under 42 CFR 422.62(a)(2)(iii). In a year when the underlying bids moved this much and the stabilization demonstration is ending, staying put is a decision worth making deliberately after comparing, not by letting the deadline pass.
About Ryan Riggins
Ryan Riggins is a senior transition advisor and former house flipper. After 8+ years buying homes from families in transition, he walked away from the cash-buyer side to help families avoid the $50K mistakes he used to profit from. Based in Greensboro, NC. NC Real Estate License #361546, eXp Realty. Founder of Riggins Strategic Solutions and the SeniorSafe app.
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Need a personalized plan? The Senior Transition Roadmap is free, by application. It adds calls with Ryan and 90 days of email support: rigginsstrategicsolutions.com/the-roadmap
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Coordinate the family in one place. SeniorSafeApp keeps daily check-ins, medications, and documents where the whole family can see them: seniorsafeapp.com
Sources
All sources checked September 4, 2026.
- CMS, Medicare Part D 2027 National Average Monthly Bid Amount Information, fact sheet, released July 28, 2026. Source for the 2027 national average monthly bid amount of $296.05, the 2027 base beneficiary premium of $41.33, the discontinuation of the Part D Premium Stabilization Demonstration at the end of CY 2026, and the statement that CMS will release the 2027 Medicare Advantage and Part D landscape and final average premiums in mid-to-late September. https://www.cms.gov/newsroom/fact-sheets/medicare-part-d-2027-national-average-monthly-bid-amount-information
- CMS, July 28, 2026 Parts C and D announcement memorandum. Source for the quoted phrase "sufficient experience under the redesigned Part D benefit," the stated intent to return the program to traditional market conditions in CY 2027, the base beneficiary premium methodology under section 1860D-13(a) of the Social Security Act as amended by section 11201 of the Inflation Reduction Act, the calculation A result of $41.33 shown as $38.99 x 1.06, the calculation B result of $94.06, and the list of factors at 42 CFR 423.286 that adjust the base premium into what an enrollee actually pays, including the difference between the plan's standardized bid and the national average monthly bid amount. https://www.cms.gov/files/document/july-28-2026-parts-c-d-announcement.pdf
- CMS, 2026 Medicare Part D Bid Information and Part D Premium Stabilization Demonstration Parameters, fact sheet, July 28, 2025. Source for the 2026 national average monthly bid amount of $239.27, the 2026 base beneficiary premium of $38.99, the uniform base beneficiary premium reduction of $15 in 2025 and $10 in 2026, the increase in the limit on a plan's total Part D premium from $35 to $50, and the demonstration's application to participating standalone prescription drug plans on a voluntary basis. https://www.cms.gov/newsroom/fact-sheets/2026-medicare-part-d-bid-information-and-part-d-premium-stabilization-demonstration-parameters
- CMS, Announcement of Calendar Year (CY) 2027 Medicare Advantage (MA) Capitation Rates and Part C and Part D Payment Policies, Attachment V, Table V-2. Source for the defined standard Part D deductible of $700 for 2027 against $615 for 2026, and the annual out-of-pocket threshold of $2,400 for 2027 against $2,100 for 2026. https://www.cms.gov/files/document/2027-announcement.pdf
- 42 CFR 422.111(d)(2), retrieved as XML from GovInfo. Source for the requirement that plans notify all enrollees of changes taking effect January 1 at least 15 days before the beginning of the annual coordinated election period. https://www.govinfo.gov/content/pkg/CFR-2024-title42-vol3/xml/CFR-2024-title42-vol3-sec422-111.xml
- 42 CFR 422.62(a)(2)(iii), retrieved as XML from GovInfo. Source for the annual coordinated election period running October 15 through December 7 beginning in 2011. https://www.govinfo.gov/content/pkg/CFR-2024-title42-vol3/xml/CFR-2024-title42-vol3-sec422-62.xml
- Medicare.gov, Plan Annual Notice of Change (ANOC). Source for the ANOC arriving in September from the plan and covering changes in coverage and costs that take effect in January, and for Medicare's instruction to review the changes and contact the plan if the notice is not received. https://www.medicare.gov/basics/forms-publications-mailings/mailings/costs-and-coverage/upcoming-plan-changes
The percentage changes stated in this post (close to 24 percent for the national average monthly bid amount and 6 percent for the base beneficiary premium) are arithmetic performed on the CMS figures cited above, not separate CMS statements.
