Millions of older Americans are about to find a plain white envelope in the mail that quietly decides how much they will pay for health care next year. Every Medicare Advantage and Part D prescription plan is required to send its members an Annual Notice of Change by September 30, spelling out how premiums, drug coverage and benefits will shift for 2027. This year the letters carry extra weight, because a federal subsidy that has held down drug-plan premiums is ending, and many notices are expected to report higher costs.
What the Annual Notice of Change Reveals
The Annual Notice of Change, often called the ANOC, is not junk mail. It lists side by side what a plan charged and covered this year against what it will charge and cover next year: the monthly premium, the deductible, the copays for doctor visits and drugs, and any changes to the formulary that determines which medications are covered. Plans must deliver it by September 30 so members have time to react before the enrollment season opens.
The document is easy to set aside and expensive to ignore. A drug that was covered this year can move to a higher cost tier or drop off the list entirely, and a premium can climb by more than the print on the page first suggests once deductibles and copays are added in. Reading the notice line by line is what turns a vague sense that “costs went up” into a concrete number a household can plan around.
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Why 2027 Premiums Are Under Pressure
Part of what is driving this year’s increases is the expiration of a temporary Part D premium stabilization program, which has been holding down what drug-plan members pay. That subsidy, worth roughly $16 per policyholder a month, ends December 31, 2026, and new premiums without it take effect January 1, 2027, according to a preview of Medicare’s 2027 enrollment period.
The impact will not fall evenly. Federal estimates suggest a portion of policyholders will see premiums hold steady or even decline, while others face increases, many in the range of $10 to $20 a month. A change of that size may sound minor, but over a year it adds up to real money for a retiree budgeting on a fixed Social Security check, and it is exactly the kind of shift the ANOC is meant to flag.
Premiums are only one line of the notice. The 2027 letters may also report changes to drug coverage as plans adjust their formularies and cost tiers, meaning a medication a retiree relies on could carry a higher copay or require prior authorization it did not before. For someone taking several prescriptions, a formulary change can outweigh a modest premium increase, which is why the drug list deserves as close a read as the premium figure.
Two Other Numbers Shaping 2027 Drug Costs
Premiums are not the only figures moving. The Inflation Reduction Act capped what a Part D member pays out of pocket for covered drugs in a year, and that ceiling, set at $2,000 in 2025, rose to $2,100 for 2026 under the program instructions issued by the Centers for Medicare and Medicaid Services in its Part D redesign guidance. Once spending reaches the cap, a plan covers 100 percent of a member’s remaining covered-drug costs for the rest of the year. The limit is indexed to inflation, so the 2027 figure will be set later and is likely to edge higher again.
Higher earners face a second charge the notice does not spell out. The income-related monthly adjustment amount, known as IRMAA, adds a surcharge to both Part B and Part D premiums for beneficiaries above certain income thresholds, and it is calculated from a tax return filed two years earlier, meaning 2027 surcharges will key off 2025 income. CMS does not publish the official 2027 brackets and dollar amounts until later in 2026, so exact figures remain unset. A retiree whose income has since fallen, often because of retirement itself, can ask the Social Security Administration to reconsider the surcharge based on that life change rather than pay on outdated income.
The Enrollment Window That Follows
The notices land just before the window to do something about them. Medicare’s Annual Enrollment Period runs October 15 through December 7, and during that stretch a member can switch to a different Advantage or Part D plan, move between Advantage and Original Medicare, or add or drop drug coverage for the year ahead. Anything chosen in that window takes effect January 1, 2027.
The most reliable way to compare options is the government’s own tool. Medicare’s Plan Finder lets a beneficiary enter current medications and pharmacies and see the total projected cost of competing plans, not just the advertised premium. Details on how to change or join a plan during the window are laid out in Medicare’s guide to joining a plan.
The Cost of Doing Nothing
The trap most enrollees fall into is inaction. A plan that does not get changed during the enrollment window simply renews on its 2027 terms, including any premium increase or dropped drug coverage described in the ANOC. Sticking with last year’s plan without checking can quietly cost hundreds of dollars over the course of a year, especially when a subsidy that softened premiums has expired.
That is why the September 30 letters matter as more than paperwork. They are the earliest and clearest warning of what a health plan will cost in 2027, delivered while there is still time to switch. Setting the notice aside unread is, in effect, a decision to accept whatever the plan has decided, and this year that decision is more likely than usual to mean paying more.
This article was researched and drafted with the assistance of AI and reviewed by The Financial Wire editorial team.
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David M. Keller is a finance writer based in Columbus, Ohio, covering personal finance and consumer-focused economic topics. He earned his degree in journalism from Ohio University and began his career reporting on local business and economic trends for a regional media outlet. Since then, he has contributed to a variety of online publications, focusing on clear, practical coverage of topics such as cost of living, debt, and everyday financial decision-making.
