Two dates govern the annual Medicare Advantage decision, but they perform different jobs. September 30 is the deadline for the plan’s disclosure; December 7 is the last day of the annual election period. The weeks between them are the household’s opportunity to turn a dense notice into a cost-and-care comparison for 2027.
The Annual Notice of Change is a contract comparison
Medicare says a plan sends an Annual Notice of Change each fall to describe changes in coverage, costs and other terms taking effect in January. Medicare Advantage materials are generally due before September 30. A missing notice is a reason to contact the plan, not a reason to assume that the existing benefits will continue unchanged.
The useful parts are the year-over-year tables. Monthly premium changes are easy to spot, but a $0 plan premium can coexist with a higher hospital copay, a larger maximum out-of-pocket limit or weaker supplemental benefits. Dental allowances, over-the-counter credits, transportation, hearing coverage and prior-authorization rules can change the annual value even when the premium does not.
Provider and pharmacy information needs a separate check. The notice can summarize network or formulary changes, yet it may not answer whether a particular cardiologist, cancer center, drug or preferred pharmacy will remain favorable. The exact plan name and contract number should be used when asking the plan and provider, because an insurer may offer several products in the same county.
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October 15 opens the decision window
CMS confirms that Medicare open enrollment runs from October 15 through December 7 every year. During that period, a beneficiary can change Medicare Advantage plans, move between Medicare Advantage and Original Medicare, or change prescription-drug coverage for the following year. A completed election generally takes effect January 1.
Plan information for the next year becomes available in October. Medicare’s official Plan Compare tool can screen plans by location, pharmacy and prescriptions, but the ranking should not end with premium. The annual medical limit, specialist copays, inpatient costs, drug deductible, drug tiers and pharmacy status belong in the same worksheet.
The drug comparison is especially sensitive to details. Two plans can cover the same medication but place it on different tiers or use different preferred pharmacies. Quantity limits, step therapy and prior authorization can change access as well as price. Entering the actual drug name, dose and frequency produces a more useful estimate than comparing generic plan summaries.
Doing nothing is still a choice. If the existing plan remains available, enrollment generally continues into the new year under the changed terms disclosed in the notice. Automatic renewal preserves coverage, not the old price or benefit design. A member who overlooks a new hospital copay or removed drug may therefore discover the change only after January, when the broad fall election window has closed.
Switching away from Medicare Advantage has an insurance wrinkle
A move to Original Medicare does not automatically include a Medigap policy. Federal guaranteed-issue protections apply in specified circumstances, and state rules can add rights, but in many situations an insurer may use medical underwriting after the initial Medigap enrollment window. That means a beneficiary should confirm Medigap eligibility and price before abandoning an Advantage plan when supplemental coverage is part of the strategy.
Prescription coverage also needs to be arranged. Most Medicare Advantage members receive Part D through the plan; Original Medicare does not include outpatient drug coverage by itself. A separate Part D plan may be necessary, and late-enrollment penalties can apply when a beneficiary goes without creditable drug coverage for too long.
Unbiased help is available through the State Health Insurance Assistance Program. The national SHIP locator connects beneficiaries with local counseling that does not sell insurance. A counselor can help interpret enrollment periods, compare plan rules and identify assistance programs for Medicare premiums and cost sharing.
A four-column review exposes the expensive changes
The first column should list care that is financially or medically essential: clinicians, facilities, prescriptions and recurring services. The second records 2026 terms, the third records the announced 2027 terms, and the fourth records the best competing plan. This prevents a prominent premium figure from crowding out the costs most likely to affect the household.
Every answer should carry a source and date. Plan documents control benefits; provider offices confirm their intended participation; Plan Compare supplies official comparison data; and written plan messages document questions that the published material leaves unclear. Screenshots and call reference numbers can support a later appeal if information proves inaccurate.
December 7 is a firm annual deadline, but the smartest work happens well before that night. The September notice creates a starting record, October plan data supplies alternatives, and the remaining weeks allow unresolved network or drug questions to be answered. Medicare’s official calendar is designed to provide that sequence; ignoring the first document compresses the entire decision into the final days.
This article was created with AI assistance and was reviewed, edited, and fact-checked 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.
