Somewhere in the next few weeks, an envelope from your Medicare plan will arrive. It will look like routine paperwork. It is not. That document — the Annual Notice of Change — is the only place your plan is required to tell you what it is changing about your coverage on January 1, and most people never open it. Open Enrollment runs October 15 through December 7, and once it closes you are generally locked in for the year.
The Dates That Matter
| When | What happens |
|---|---|
| By September 30 | Your plan must deliver the Annual Notice of Change (ANOC) |
| Around October 1 | Next year's plan details post to Medicare's Plan Finder |
| By October 15 | Most plans deliver the Evidence of Coverage (EOC) |
| October 15 – December 7 | Open Enrollment — make changes |
| January 1 | Changes take effect |
The useful reframe: your starting gun is the ANOC arriving in late September, not the October 15 opening date. Starting when it lands gives you roughly two weeks before Plan Finder traffic and phone hold times spike.
Why "My Plan Is Fine" Is Not a Safe Assumption
Medicare Advantage and Part D plans are permitted to change their premiums, deductibles, copays, drug formularies, and provider networks every January 1. Having the same plan name next year does not mean having the same plan.
Three changes cause the most damage, and all three are easy to miss:
A drug moves tiers or leaves the formulary
A medication covered in 2026 may not be covered in 2027, or may move to a higher cost tier. This single change can swing your annual costs by thousands of dollars, and nothing about it is visible until you fill the prescription in January.
Your doctor leaves the network
Medicare Advantage plans contract with specific providers, and those contracts change. Discovering in February that your cardiologist is out of network is a considerably worse experience than discovering it in October.
Your pharmacy stops being preferred
The same drug at the same plan can cost meaningfully different amounts depending on which pharmacy you use. Preferred pharmacy lists change annually.
What You Can Actually Change
During October 15 to December 7, you can:
- Switch from Original Medicare to a Medicare Advantage plan
- Drop Medicare Advantage and return to Original Medicare
- Switch between Medicare Advantage plans
- Join, drop, or change a Part D prescription drug plan
There is a second, narrower window from January 1 to March 31 — the Medicare Advantage Open Enrollment Period. If you are already in an MA plan, you can make one change: switch to a different MA plan, or return to Original Medicare and pick up a drug plan. You cannot use it to join an MA plan from Original Medicare, and you cannot use it to change a standalone Part D plan.
There is also a one-time Special Enrollment Period allowing a switch into a 5-star plan, if one is available in your area.
A Review That Takes About an Hour
Done in this order, the process is manageable.
1. Read the ANOC the week it arrives
Look specifically for changes to your premium, your deductible, your drugs' tiers, and your providers' network status. If you cannot find the document, call your plan or check its website for a copy.
2. Write down every medication with exact dosage
Not "my blood pressure pill" — the name, the strength, and the quantity. Plan Finder results are only as accurate as this list.
3. Verify your key doctors are still in network
Check with the plan directly rather than relying on an online directory alone. Directories are frequently out of date.
4. Estimate total annual cost, not premium
Premium plus expected deductible plus expected copays. A plan with a lower premium routinely costs more over a year once your specific drugs are priced in.
5. Run Plan Finder twice
Once with your usual pharmacy selected, once with the largest mail-order option. The difference is often surprising.
6. Submit or confirm before early December
Do not aim for December 7. Aim for the first week of December, so a problem does not become a missed deadline.
Free Help Exists and Is Underused
Every state has a State Health Insurance Assistance Program (SHIP) offering free, unbiased Medicare counseling. Counselors are not paid on commission and do not sell plans.
This distinction matters. A licensed insurance agent can be genuinely helpful, but agents are typically compensated by the plans they enroll you in, and not every agent represents every plan. A SHIP counselor has no such incentive. If you are helping a parent through this and want a second opinion, that is where to get one.
If You Are Satisfied, You Can Do Nothing
Worth stating plainly: the goal is not automatically to find a new plan. CMS's own guidance is to review your materials and make sure your plan will still meet your needs. If you have read the ANOC, your drugs and doctors are still covered, and the cost changes are acceptable, staying put is a legitimate outcome.
The failure mode is not staying — it is staying without having read the notice, and finding out in January.
For Caregivers
If you help a parent or relative manage their coverage, this seven-week window is the one time each year you can fix things. It is worth putting on your own calendar rather than theirs.
A practical note: the volume of Medicare marketing mail and phone calls increases sharply during this period. Legitimate plan documents come from the plan itself; unsolicited calls pressing for an immediate decision deserve skepticism. Medicare does not call people to sell plans.
FAQ
What is the ANOC and when does it arrive?
The Annual Notice of Change details every modification your plan is making for the coming year — costs, coverage, networks, formulary. Plans must deliver it by September 30.
What happens if I miss December 7?
You generally remain in your current plan for the following year, even if premiums rose or your pharmacy left the network. Limited exceptions exist through Special Enrollment Periods triggered by qualifying events.
Can I change my Medigap plan during Open Enrollment?
Medigap follows different rules from Medicare Advantage and Part D. The October–December window does not carry the same guaranteed rights for Medigap, and medical underwriting may apply depending on your circumstances and state. Check before assuming you can switch freely.
Is a plan with a lower premium cheaper?
Not necessarily, and often not. Total annual cost includes deductibles and copays on your specific medications. Compare the full picture rather than the monthly number.
Where do I compare plans?
Medicare's official Plan Finder at medicare.gov, ideally run with your exact medication list and your actual pharmacy selected.
This article is general information and not medical, legal, or insurance advice. Medicare eligibility, plan availability, benefits, and individual circumstances vary considerably, and program details change from year to year. Verify current information at medicare.gov, with your plan directly, or through your state's SHIP program before making decisions about your coverage.
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