Florida is home to a large population of current and retired federal employees — from the many federal agencies with South Florida operations to the military-affiliated federal workers throughout the state. Federal civilian employees have access to the Federal Employees Health Benefits Program (FEHB), which offers a range of health plans administered through the Office of Personnel Management (OPM). When a federal employee or retiree approaches Medicare eligibility, the interaction between FEHB and Medicare creates one of the most complex — and highest-stakes — coverage decisions in the Medicare landscape. This guide explains how FEHB and Medicare coordinate, when keeping FEHB makes sense versus dropping it for Medigap, and the critical irreversibility issue every federal retiree must understand before making any changes.
In This Guide
The Federal Employees Health Benefits Program covers more than 8 million federal employees, retirees, and their families. Unlike Medicare Advantage, FEHB is not a Medicare product — it's a separate federal employee benefit. Eligible federal retirees who maintained FEHB enrollment for the 5 years prior to retirement can continue FEHB coverage in retirement with the government continuing to pay its share of the premium.
FEHB plans include health maintenance organizations, fee-for-service plans, consumer-driven plans, and high-deductible plans. The two largest and most well-known FEHB plans for federal employees nationally are the Blue Cross Blue Shield Federal Employee Plan (BCBS FEP) and the Government Employees Health Association (GEHA). Both operate nationwide and both have specific Medicare coordination features.
Comparing Medicare plans in Florida
When you have both FEHB and Medicare, the coordination of benefits rules determine which payer is primary (pays first) and which is secondary (pays what's left). For federal retirees enrolled in both:
The specifics vary significantly by FEHB plan. Some FEHB plans are more generous in their secondary coordination than others. Review your plan's Evidence of Coverage brochure (available through OPM's healthcare website) and look for the section on "Medicare and FEHB coordination" to understand how your specific plan pays when Medicare is primary.
One of the most important — and most commonly misunderstood — rules for federal employees involves Medicare Part B delay. The rule: active, current federal employees covered by FEHB can delay Part B enrollment without incurring the late enrollment penalty, because FEHB based on active federal employment qualifies as "employer coverage" for Medicare delay purposes.
The critical caveat: once you retire from federal service, your FEHB coverage transitions to retiree coverage. Retiree FEHB does NOT qualify as active employer coverage for Part B delay purposes. At that point, you have an 8-month Special Enrollment Period to enroll in Part B without penalty. Failing to do so during that 8-month window will result in a permanent late enrollment penalty — even though you continued to have FEHB retiree coverage throughout.
Florida federal retirees face a genuine choice: keep FEHB in retirement alongside Medicare, or drop FEHB and purchase Medigap Plan G (plus a standalone Part D drug plan). Both options can provide excellent coverage, but the economics differ based on your specific FEHB plan and premium.
Among FEHB plans available nationwide, several are known for particularly favorable Medicare coordination:
| FEHB Plan | Medicare Coordination Feature |
|---|---|
| BCBS FEP (Blue Cross Blue Shield Federal Employee Program) | Reimburses the Part B premium for some members; strong secondary coverage on cost-sharing |
| GEHA (Government Employees Health Association) | High-deductible option pairs well with Medicare; some plans effectively eliminate most cost-sharing with Medicare as primary |
| MHBP (Mail Handlers Benefit Plan) | Competitive Medicare secondary coordination; available to most federal employees |
| Aetna FEHB Plans | Medicare Advantage-integrated options available to some federal employees in certain years |
Plan offerings and Medicare coordination details change during FEHB Open Season each year (mid-November to mid-December). Always review the current year's plan brochure before making any decisions.
The single most important caveat for Florida federal retirees considering dropping FEHB: once you disenroll from FEHB in retirement, you generally cannot re-enroll. This is a decision that cannot easily be undone. If you drop FEHB, purchase Medigap Plan G, and later experience health changes that make you wish you had stayed with FEHB, there is typically no path back. Contrast this with Medicare Advantage, where you can switch plans annually during AEP, or even with Medigap, where switching carriers is possible (though requires underwriting). FEHB disenrollment in retirement is one of the few Medicare-adjacent decisions with permanent consequences.
Before disenrolling: get a written comparison of your total annual costs under (1) keeping FEHB + Medicare with no Medigap versus (2) dropping FEHB + Medicare + Medigap Plan G + Part D. Consider the dental and vision coverage differential. Consider your dependents. And seriously weigh the irreversibility before signing anything.
Compare keeping your FEHB against switching to Medigap. Talk to a licensed Florida Medicare agent who understands federal employee benefit coordination — at no cost.
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