Medicare Enrollment Guide for Florida Residents: Timelines, Costs, and Common Mistakes

Medicare enrollment rules are federal, so the core deadlines are the same in Florida as in every other state. The first step is determining whether you will be enrolled automatically or must sign up through Social Security.

Your Initial Enrollment Period generally lasts 7 months. It starts 3 months before the month you turn 65, includes your birthday month, and ends 3 months after. If your birthday is on the first day of a month, Medicare uses a different timing rule, so confirm the dates with Medicare’s eligibility calculator.

Some people get Part A and Part B automatically. Medicare.gov says automatic enrollment generally applies when Social Security or Railroad Retirement Board benefits start at least 4 months before age 65. Other people must sign up. Assuming that everyone is automatic—or that no one is—is inaccurate.

Part A is Hospital Insurance. It helps cover inpatient hospital care, eligible skilled nursing facility care, hospice, and covered home health care. In 2026, Part A is premium-free for most people; people who must buy it pay $311 or $565 per month depending on work history.

Part B is Medical Insurance. It helps cover doctors and other providers, outpatient care, home health care, durable medical equipment, and many preventive services. The standard Part B premium is $202.90 per month in 2026, and the annual deductible is $283. Higher-income beneficiaries may pay more through IRMAA.

The Part B Special Enrollment Period is not a generic 60-day rule. If you delayed Part B because you or your spouse had group health plan coverage based on current employment, you can generally enroll while that coverage continues or during the 8 months after the employment or coverage ends, whichever happens first. COBRA and retiree coverage do not extend that 8-month period.

If no exception applies, the Part B late-enrollment penalty is generally 10% of the standard premium for each full 12-month period you could have had Part B but did not. You usually pay the penalty for as long as you have Part B. That is why the coverage source and employment status need to be verified before delaying.

Part C, also called Medicare Advantage, is another way to receive Medicare-covered benefits through a Medicare-approved private plan. You must have Part A and Part B and keep paying the Part B premium. Costs, networks, service areas, drug coverage, and authorization rules vary by plan.

Part D helps cover prescription drugs. After your Initial Enrollment Period, going 63 days or more without Part D or other creditable drug coverage can trigger a late-enrollment penalty. The penalty is generally 1% of the national base beneficiary premium for each full uncovered month and is usually charged for as long as you have drug coverage.

In 2026, Part D premiums and cost sharing vary by plan. No Part D deductible can exceed $615, and covered-drug out-of-pocket spending is capped at $2,100 before catastrophic coverage begins. The old coverage-gap or ‘donut hole’ description is no longer the correct structure for 2026.

Medicare Open Enrollment runs October 15 through December 7. During that period, people can change how they receive Medicare coverage or change drug plans, with new coverage generally starting January 1. It is not the only possible change window: Medicare Advantage Open Enrollment and Special Enrollment Periods have separate rules.

Medigap supplements Original Medicare; it does not work with Medicare Advantage. The federal Medigap Open Enrollment Period is a one-time 6-month period that starts the first month you have Part B and are 65 or older. During that period, an insurer generally cannot use medical underwriting to deny a policy or charge more because of health problems. Outside that period, federal guaranteed-issue rights are limited and state protections may differ.

For Florida residents comparing options, use Medicare Plan Compare for current premiums, drug lists, pharmacies, quality information, and plan details. Verify doctors and hospitals directly with both the provider and the plan before enrolling because online directories can change.

Common mistakes include assuming enrollment will be automatic, treating COBRA as current-employment coverage for Part B timing, confusing the 8-month Part B Special Enrollment Period with the 63-day Part D creditable-coverage rule, and relying on last year’s plan details.

For official help, Medicare.gov and 1-800-MEDICARE are the primary federal sources. Florida’s SHINE program is the state’s official, free, unbiased counseling program for Medicare beneficiaries and caregivers. Plan-specific recommendations should come from an appropriately licensed professional.