Every September, tens of millions of Medicare Advantage and Part D enrollees receive a plain-looking envelope labeled Annual Notice of Change (ANOC). Plenty mistake it for junk mail. In reality, that envelope is the document that tells a reader exactly how their plan will differ on January 1, and the deadline to do anything about it is December 7.
If a retiree is on Original Medicare with no drug plan and no Advantage plan, the ANOC does not apply. Everyone else on Part D or Medicare Advantage should keep the letter on the kitchen table until they have read it.
Why This Year’s Letter Matters More Than Last Year’s
The ANOC does not set the government’s Part A and Part B costs, but those expenses form the starting line for next year’s budget. The standard Part B premium rose to $202.90 per month in 2026, an increase of $17.90 from $185.00 in 2025. The annual Part B deductible climbed to $283, up $26 from $257. The Part A inpatient hospital deductible now sits at $1,736, an increase of $60 from $1,676 in 2025.
The Social Security cost-of-living adjustment (COLA) for 2026 came in at 2.8%. For a retiree collecting a $2,000 monthly benefit, that produced a $56 raise. The Part B increase took nearly one-third of it before the deposit hit the checking account. There is not much room left for a drug moving to a higher tier or a familiar doctor leaving the network.
What the ANOC Actually Tells You
The ANOC is plan-specific. It lays out four things the reader needs to check line by line:
- Premium change. Advantage plans can move from $0 to a monthly premium, or vice versa. Standalone Part D premiums can also move sharply.
- Formulary change. A drug that sat on Tier 2 this year can jump to Tier 4 next year, or drop off the formulary entirely. This is where the sticker shock happens in February.
- Pharmacy network change. A preferred pharmacy can quietly become standard, raising the cost of every refill.
- Provider network change. Advantage plans drop hospital systems and specialist groups every year. The doctor who has been seeing the reader for a decade may no longer be in-network on January 1.
One thing the ANOC does not decide is IRMAA. Social Security sends a separate notice setting any income-related Part B and Part D surcharges, generally using tax information from two years earlier. Do not look for a final 2027 IRMAA determination inside the plan letter.
The Auto-Renewal Trap
A retiree who does nothing between October 15 and December 7 is re-enrolled into the same plan on its new terms. The formulary, pharmacy tiers, provider network, and premium may have changed underneath. Silence is consent to the new version, not a return to the old one.
Auto-renewal preserves the enrollment. It does not preserve the plan you thought you had.
What to Do Before December 7
The ANOC is a before-and-after sheet. Three checks will tell you whether the new version still deserves your business.
- Pull every prescription off the shelf and price it in the Plan Finder at Medicare.gov. Enter the drugs, doses, and preferred pharmacy. The tool will rank Part D and Advantage plans by estimated total annual cost, not premium alone. The lowest-premium plan may not be the cheapest for a reader with several prescriptions.
- Confirm the primary doctor and any specialists are in-network for 2027. Call the provider’s billing office and ask which Advantage contracts they will accept next year. Then confirm the answer with the plan. Its online directory is the starting point, not the final word.
- Handle IRMAA separately. If Social Security bases the 2027 surcharge on 2025 income but retirement, reduced work, divorce, or a spouse’s death later cuts household income, request a reduction using Form SSA-44 or Social Security’s online process. A Roth conversion or home sale is not a qualifying life-changing event.
The ANOC is boring on purpose. Reading it is the highest-return hour a Medicare enrollee will spend this fall. It has earned its place on the kitchen table.
Contact [email protected] for any questions or corrections.
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