Every Medicare Advantage Plan Mails a Notice by Sept. 30 Listing What It’s Dropping Next Year. Most Retirees Toss It. The Ones Who Read It Have Until Dec. 7 to Leave

Medicare Advantage members are receiving a document this week that determines their health coverage for all of 2027. It is the Annual Notice of Change, and every Medicare Advantage plan that intends to keep operating next year must send one to its members. 24/7 Wall St. notes that members of continuing plans must receive an Annual Notice of Change by September 30. It arrives in a plain envelope, looks like routine insurance paperwork, and the reader is under no obligation to do anything with it.

This notice differs from the nonrenewal notice sent to members whose plans are being terminated. A termination opens a guaranteed-issue right to Medigap. An ANOC does not. The ANOC is for people whose plan still exists, whose card still works, and whose benefits are simply changing on January 1, as 24/7 Wall St. reported.

What the Envelope Contains

The document lists what the plan covered this year and what it will cover next year. The drug formulary shows where a maintenance prescription can move to a higher cost tier, pick up a prior authorization requirement, or drop off the covered list entirely. The provider network shows where a primary care doctor or hospital system can be removed, meaning January visits are suddenly out of network. The cost-sharing pages show the new out-of-pocket maximum, specialist copay, imaging copay, and inpatient per-day charge.

Supplemental benefits like dental, vision, hearing, and over-the-counter allowances are where trimming typically shows up first. Axios reported earlier this month that Medicare Advantage plans appear to be cutting benefits in 2027. These are the benefits members remember from the sales pitch, which is why comparing the old page to the new page matters.

Doing Nothing Is a Decision

A member who does not open the envelope is automatically re-enrolled in the changed version of the plan. The formulary changes apply. The network changes apply. The copay increases apply. Non-response is treated as acceptance, and the changes take effect on January 1, per 24/7 Wall St.’s reporting.

The pressure to absorb these changes matters more when income doesn’t keep pace. The 2027 Social Security cost-of-living adjustment is tracking toward 3.3%, with two of three Q3 months in. A higher specialist copay or a drug that jumps two tiers can absorb that adjustment before the first check clears, and that is before IRMAA surcharges and other Medicare costs enter the picture (we mapped the surcharges and coverage gaps most retirees miss in a free guide here: Medicare’s Hidden Bills).

Enrollment Calendar Is Shorter Than It Looks

Medicare Open Enrollment runs from October 15 through December 7, when it closes, so changes elected in that window take effect January 1. After December 7, a member of a continuing plan generally cannot switch because of a new formulary issue.

The Medicare Advantage Open Enrollment Period runs January 1 through March 31 and allows a current MA enrollee to switch to a different MA plan or drop back to Original Medicare with a standalone Part D plan. It does not create a right to buy a Medigap policy on favorable terms and can only be used once.

Medigap Enrollment Window May Already Be Closed

The risk arises when switching back to Original Medicare. A member who reads the ANOC, dislikes the changes, and wants to pair Original Medicare with a Medigap policy faces a different situation than someone whose plan was terminated. 24/7 Wall St. has noted that the initial Medigap enrollment period runs six months, and outside that window, outside a guaranteed-issue event, a Medigap insurer in most states may apply medical underwriting and can decline the application outright.

A retiree can drop Advantage coverage by December 7, apply for Medigap in December, and still be denied, which means they then land in Original Medicare with no supplemental coverage and full exposure to Part A and Part B cost sharing. The sequence matters: secure a written Medigap acceptance first, then cancel the Advantage plan.

What to Verify Before September Ends

Find the notice and match every prescription against the 2027 formulary by name and tier. Confirm every treating doctor and hospital is in network for 2027. Compare the new out-of-pocket maximum to the current one. If a broker is involved, ask to see Original Medicare with a Medigap policy and Part D priced alongside any Advantage recommendation.

The date is September 30, so before making any move, confirm in writing that a Medigap insurer will accept the application. There is no going back because once that door closes, the ANOC becomes the only coverage document that matters.

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