If you’re on Medicare, this fall’s mailbox is about to fill up fast — colorful brochures, TV ads with celebrities, and a genuine deadline buried somewhere in all of it. Here’s the clear version: when the window actually opens and closes, what you can change, and what happens if you let it pass you by.
The Key Dates
Medicare’s Annual Enrollment Period (AEP) runs October 15 – December 7, 2026. Any changes made during this window take effect January 1, 2027.
This is the main annual opportunity for anyone on Medicare to:
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Switch from Original Medicare to a Medicare Advantage plan
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Switch from a Medicare Advantage plan back to Original Medicare
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Switch from one Medicare Advantage plan to another
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Join, switch, or drop a Medicare Part D prescription drug plan
If you’re happy with your current plan and don’t make any changes, most plans will simply renew automatically for the following year — but “automatic” doesn’t always mean “still the best fit,” which is exactly why this window is worth using even if you think you’re set.
What AEP Doesn’t Cover
Two common points of confusion worth clearing up:
Medicare Supplement (Medigap) plans are not part of AEP. There’s no annual enrollment period for Medigap — you can apply to switch any time of year, though outside your initial enrollment window, applications are typically subject to medical underwriting in most states, North Carolina included.
The Medicare Advantage Open Enrollment Period (MA OEP) is a separate, more limited window running January 1 – March 31. If you’re already on a Medicare Advantage plan, this gives you one additional chance early in the year to switch to a different Medicare Advantage plan or drop MA entirely and return to Original Medicare. It does not let you switch Part D plans on its own or join Medicare Advantage for the first time from Original Medicare — that’s AEP-only.
What’s Actually Changing Each Year
Every fall, health and drug plans send out an Annual Notice of Change (ANOC) — usually arriving by the end of September — that spells out what’s different about your plan for the coming year. This is the single most important piece of mail to actually read, because plan details reset annually and often shift more than people expect: premiums, deductibles, provider networks, prescription drug formularies (which drugs are covered and at what cost tier), and prior authorization requirements can all change from one year to the next, even if you’re staying with the same carrier and plan name.
As a general trend, CMS has been reporting modest average declines in Medicare Advantage and Part D premiums nationally in recent years, along with the $2,000-range annual cap on out-of-pocket prescription drug costs that took effect as part of recent Medicare drug pricing reforms. But “average” doesn’t mean “your plan” — the only way to know what’s actually changing for you is to read your ANOC and compare it against what else is available, which is exactly what AEP is for.
What Happens If You Miss It
This is the part that catches people off guard. If December 7 passes and you haven’t made a change, you’re generally locked into your current Medicare Advantage or Part D plan for the entire following year, with only a few narrow exceptions:
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The Medicare Advantage Open Enrollment Period (Jan 1 – Mar 31), but only if you’re already on a Medicare Advantage plan, and only for the limited changes described above
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A Special Enrollment Period (SEP), which is only available for specific qualifying situations — moving out of your plan’s service area, losing other coverage, qualifying for Extra Help, or a handful of other defined events
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The 5-star Special Enrollment Period (Dec 8 – Nov 30), which allows a one-time switch into a 5-star rated plan, if one is available in your area
Outside of those situations, missing AEP typically means waiting a full additional year with a plan that may no longer fit your needs — whether that’s a network that no longer includes your doctor, a formulary that no longer covers your prescription affordably, or a premium that’s higher than what’s now available elsewhere.
How to Get Ready Before October 15
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Watch your mail (and email, if you’ve opted in) for your ANOC letter in September
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Pull together your current list of doctors, specialists, and prescriptions so you can check them against any plan you’re considering
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Note any changes to your health this year that might affect what coverage makes sense
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Give us a call at (828) 883-3200. We’re happy to walk through your ANOC letter with you and compare your options across plans before you commit.
