Every fall, Florida's 4.7 million Medicare beneficiaries face the same season of mailbox stuffers, TV ads, and urgent phone calls urging them to "review their Medicare coverage." The noise is real, but so is the opportunity. Medicare's Annual Enrollment Period is the primary window when you can make meaningful changes to your coverage — and the decisions you make during this 54-day window will affect your healthcare costs for an entire year.
This guide cuts through the confusion. We'll walk you through exactly what you can change, what you can't, how Florida's Medicare Open Enrollment Period differs from AEP, and what Special Enrollment Periods exist if your circumstances change mid-year. We'll also cover Florida-specific resources that can make the comparison process far less overwhelming.
In This Guide
Medicare's Annual Enrollment Period — commonly called AEP or "open enrollment" — runs from October 15 through December 7 every year. It is the main window during which Medicare beneficiaries can make changes to their coverage that take effect on January 1 of the following year.
It is important to distinguish Medicare open enrollment from ACA (Affordable Care Act) open enrollment, which runs November 1 – January 15 and applies to marketplace health insurance plans. If you are on Medicare, you are not eligible for marketplace plans, and ACA open enrollment does not apply to you.
During AEP, every Medicare beneficiary in Florida — whether enrolled in Original Medicare, Medicare Advantage, or a standalone Part D drug plan — has the ability to review and revise their coverage. Most changes during this window take effect January 1, giving you a full year of the coverage you selected.
The Annual Enrollment Period allows a broad range of coverage changes. Here is what Florida Medicare beneficiaries can do during October 15 – December 7:
| Change | Allowed During AEP? |
|---|---|
| Switch from Original Medicare to Medicare Advantage | Yes |
| Switch from Medicare Advantage back to Original Medicare | Yes |
| Switch from one Medicare Advantage plan to another | Yes |
| Join a Part D drug plan (if not currently enrolled) | Yes |
| Switch from one Part D plan to a different Part D plan | Yes |
| Drop a Part D plan (without penalty if you have other creditable coverage) | Yes |
| Switch Medigap (Medicare Supplement) plans | No — medical underwriting required |
The Medigap exception is one of the most misunderstood rules in Medicare. Many beneficiaries assume AEP lets them freely switch Medigap plans, but it does not. Medigap plans operate under separate rules: you can apply for a new Medigap policy at any time of year, but outside of guaranteed issue periods, Florida insurers can deny you coverage or charge higher premiums based on your health history. The only federally guaranteed Medigap open enrollment window is the six-month period that begins when you turn 65 and enroll in Part B for the first time.
The Medicare Advantage Open Enrollment Period runs from January 1 through March 31 each year. It is a more limited window than AEP, with important restrictions Florida beneficiaries should understand:
OEP changes typically take effect the first day of the month after your enrollment request is processed. So a change made in February would generally take effect March 1.
Special Enrollment Periods allow Medicare beneficiaries to make changes outside of AEP and OEP when specific qualifying life events occur. Florida residents may qualify for an SEP in the following situations:
The Medicare Plan Finder at medicare.gov is the official tool for comparing Medicare Advantage and Part D plans during open enrollment. Here is how to get the most out of it:
Florida's SHINE (Serving Health Insurance Needs of Elders) program provides free, unbiased Medicare counseling through trained volunteers across all 67 counties. SHINE counselors do not sell insurance and have no financial interest in the plans they discuss — they are an excellent resource for objective plan comparisons.
Florida offers more Medicare counseling resources than most states, which makes sense given that Florida has one of the highest concentrations of Medicare beneficiaries in the country. These resources are all free:
| Enrollment Period | Dates | Coverage Effective Date |
|---|---|---|
| Annual Enrollment Period (AEP) | Oct 15 – Dec 7 | January 1 |
| Medicare Advantage OEP | Jan 1 – Mar 31 | First of following month |
| Initial Enrollment Period (IEP) | 3 months before to 3 months after 65th birthday month | Varies by when in IEP you enroll |
| Special Enrollment Period (SEP) | Triggered by qualifying event | Varies by SEP type |
| Five-Star SEP | Year-round (Dec 8 – Nov 30) | First of following month |
Timing also matters within AEP itself. If you enroll in a new plan on December 7 (the last day of AEP), your coverage still takes effect January 1 — the same as if you had enrolled on October 15. However, enrolling earlier gives you more time to confirm your doctors and pharmacy network before your new coverage begins.
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When does Medicare open enrollment start in Florida?
Medicare's Annual Enrollment Period (AEP) runs October 15 through December 7 every year. Changes made during AEP take effect January 1 of the following year. This applies to all Florida Medicare beneficiaries regardless of which county they live in.
Can I switch from Medicare Advantage back to Original Medicare during AEP?
Yes. During AEP you can disenroll from a Medicare Advantage plan and return to Original Medicare (Parts A and B). You should also enroll in a standalone Part D plan at the same time to avoid a late enrollment penalty for drug coverage.
Can I change my Medigap plan during Medicare open enrollment?
No. Medigap (Medicare Supplement) plans are NOT governed by AEP. In Florida, you can apply for a Medigap plan at any time, but insurers can require medical underwriting and deny coverage or charge higher premiums based on your health — except during guaranteed issue windows such as your initial Medigap Open Enrollment Period when you first turn 65 and enroll in Part B.
What if I miss the Medicare AEP deadline in Florida?
If you miss the December 7 AEP deadline, you generally must wait until the next AEP (starting October 15) to make changes — unless you qualify for a Special Enrollment Period based on a qualifying life event such as moving, losing other coverage, or qualifying for Medicaid.
How do I compare Medicare Part D plans during open enrollment?
Use the Medicare Plan Finder at medicare.gov. Enter your zip code and current medications to see 2026 Part D plan options, estimated annual drug costs, and pharmacy networks. Florida also offers free help through SHINE counselors (1-800-963-5337) who can walk you through comparisons at no charge.