When Can I Switch Medicare Plans in Florida?

One of the most common questions I get from clients across Tampa Bay — from Clearwater to St. Petersburg, Safety Harbor to Brandon — is some version of: "Irene, it's April. Can I switch my Medicare plan right now, or do I have to wait until fall?"

The honest answer: it depends on which Medicare plan you have, what changed in your life recently, and whether a county near you has been under a federal disaster declaration (which, in Florida, is more often than you'd think). This is a plain-English guide to every Medicare enrollment period, written specifically for Florida residents.

1. Initial Enrollment Period (IEP) — when you turn 65

Your IEP is a seven-month window that begins three months before the month of your 65th birthday, includes your birthday month, and continues for three months after. If you were born in August, your IEP runs from May 1 through November 30. If you'd rather not do the calendar math, the Turning 65 in Florida wizard will spell out your exact dates.

During your IEP, you can enroll in Part A (hospital), Part B (medical), Part D (prescriptions), a Medicare Advantage plan, or a Medicare Supplement. The earlier you enroll inside the window, the sooner your coverage starts.

The catch: missing your IEP can cause permanent late enrollment penalties on your Part B and Part D premiums — added to every monthly premium for the rest of your life. You can estimate what that penalty would cost you with my calculator. Most people don't realize this until they get the bill. If you have a birthday coming up in the next six months, that's the single best time to book a free consultation.

📘 Approaching 65 right now? Read the companion guide: Turning 65 in Florida? A 7-Step Medicare Enrollment Timeline — a practical month-by-month checklist starting nine months before your birthday.

2. Annual Election Period (AEP) — October 15 to December 7

Often just called "Medicare Open Enrollment," AEP is the biggest switch window of the year. Every Medicare-eligible person — whether they have Original Medicare, Medicare Advantage, or a Part D drug plan — can make changes during this window. Changes take effect January 1 of the following year.

During AEP you can:

• Switch from Original Medicare to Medicare Advantage (Part C)
• Switch from Medicare Advantage back to Original Medicare
• Switch from one Medicare Advantage plan to a different one
• Switch from one Part D prescription drug plan to another
• Enroll in Part D for the first time (late enrollment penalty may apply)

For 2026 coverage, AEP ran from October 15 through December 7, 2025. For 2027 coverage, AEP runs October 15 through December 7, 2026. The Centers for Medicare & Medicaid Services publishes each year's plan details about two weeks before AEP opens, giving you a brief window to compare before the clock starts.

3. Medicare Advantage Open Enrollment Period (MA OEP) — January 1 to March 31

This one is often misunderstood. The MA OEP exists for people who already have a Medicare Advantage plan and want to make one change early in the year — usually because something about their 2026 plan turned out not to match what the brochure suggested.

If you're currently in a Medicare Advantage plan, between January 1 and March 31 you can:

• Switch to a different Medicare Advantage plan (one time only)
• Drop your MA plan and return to Original Medicare, optionally adding a standalone Part D plan

What you cannot do during MA OEP:

• Switch from Original Medicare to Medicare Advantage
• Switch from one standalone Part D drug plan to another (unless you were on MA with drug coverage)
• Make more than one change during the window

Changes made during MA OEP take effect the first of the month after you enroll.

4. General Enrollment Period (GEP) — January 1 to March 31

GEP is the safety net for people who missed their Initial Enrollment Period entirely. If you didn't sign up for Part A or Part B when you first became eligible, GEP lets you enroll during the first quarter of each year, with coverage typically starting the following month. Late enrollment penalties usually apply for missed Part B and Part D signups.

5. Special Enrollment Periods (SEPs) — life changes

SEPs are what most people don't know about. Anytime your life situation changes in a way that affects your coverage, you likely have 60 days to make a change outside the normal enrollment windows.

Common triggers for a Special Enrollment Period:

• You moved — even within Florida, if the move changes your plan's service area (or across county lines, which often matters for Medicare Advantage)
• You lost your current coverage involuntarily (employer plan ending, COBRA ending, Medicaid status changing)
• You gained Medicaid — this triggers Extra Help and opens dual-eligible plan options
• Your plan left the Medicare program or reduced its service area
• You moved into or out of a skilled nursing facility
• Your plan’s contract with Medicare was terminated for performance reasons

Each of these comes with its own rules about how long the window stays open (typically 60 days from the triggering event) and what changes you can make. This is where an agent is genuinely useful — most people don't realize they qualify for an SEP until I ask the right question.

6. Florida hurricane and disaster SEPs

Here's the one that affects Tampa Bay more than almost anywhere else in the country: the Disaster Special Enrollment Period, often called the FEMA SEP or DST SEP.

If you live in a Florida county that's been placed under a FEMA-declared major disaster or emergency declaration — and Florida had multiple in 2024 alone, including Hurricane Debby and Hurricane Helene — and you missed a valid enrollment period because of the disaster, you can change Medicare plans under the Disaster SEP.

The Disaster SEP applies if:

• You live in (or you rely on a caregiver who lives in) a FEMA-declared disaster or emergency area
• You had a valid enrollment period (AEP, IEP, another SEP) active during the incident period
• You were unable to make your enrollment decision because of the disaster
• You did not already use the enrollment period you missed

The window typically starts the day of the incident and lasts about four calendar months, though exact dates depend on the specific FEMA declaration. For Tampa Bay, this has come up repeatedly for Pinellas and Hillsborough County residents during hurricane seasons.

Call 1-800-MEDICARE or a licensed Medicare agent to check whether a disaster SEP applies to your situation — most people have no idea the option exists.

7. Medicare Supplement (Medigap) has different rules

One common misconception: the enrollment periods above apply to Medicare Advantage and Part D. Medicare Supplement (Medigap) plans operate under separate rules — and in most states, including Florida, you can apply for a Medigap plan at any time of year.

The catch with Medigap outside your initial window: carriers can use medical underwriting. That means they can raise your premium or decline coverage based on health conditions. Your one guaranteed-issue window — when carriers must accept you regardless of health — is the six-month Medigap Open Enrollment Period that starts the month you're 65 or older AND enrolled in Part B.

Miss that six-month window and the game changes. In Florida, there's no additional state-mandated guaranteed-issue right, though federal rules do create a few SEP-style guaranteed-issue triggers (like your Medicare Advantage plan terminating or moving out of its service area).

Frequently asked questions

Sources and further reading: Medicare.gov — When coverage starts, CMS — Special Enrollment Periods, Medicare Rights Center — MA OEP guide.

This article is for general information. It is not legal, tax, or personalized insurance advice. Plan rules and dates can change. Always verify current details with CMS, Medicare.gov, or a licensed agent before making an enrollment decision.