Key Takeaways
- Understanding FEHB and Medicare Part B rules is essential for making informed federal retiree health coverage decisions.
- Careful coordination of benefits can help ensure comprehensive coverage and avoid late enrollment penalties.
Many federal retirees approach age 65 with questions about how their Federal Employees Health Benefits (FEHB) program and Medicare Part B work together. Knowing the official rules for each program—and how to coordinate them—gives you the tools to make choices that fit your retirement health coverage needs.
What Is FEHB and Medicare Part B?
Overview of FEHB program
The Federal Employees Health Benefits (FEHB) program is the main health insurance program for federal employees, retirees, and their eligible family members. FEHB offers access to a wide range of plans, all reviewed and approved by the Office of Personnel Management (OPM). Once you retire, you typically keep your FEHB coverage, provided you meet certain service and enrollment requirements.
Introduction to Medicare Part B
Medicare Part B is a part of the federal Medicare program and helps cover outpatient medical services like doctor visits, lab work, and preventive care. Most individuals become eligible for Medicare at age 65. Unlike FEHB, enrollment in Part B is optional, but comes with separate costs and specific enrollment periods. Together, FEHB and Part B can offer broader coverage in retirement.
Why Do Federal Retirees Weigh Both?
Eligibility rules and requirements
To continue FEHB as a retiree, you generally need to retire on an immediate annuity and have been enrolled in FEHB for at least five years before retiring (or for the duration of your federal career if less than five years). For Medicare Part B, you become eligible at age 65 if you or your spouse worked and paid Medicare taxes for the required period. You are not required to enroll in Part B if you have FEHB, but doing so is a personal decision based on your coverage needs.
Timing for enrollment
The window to sign up for Medicare Part B is called the “Initial Enrollment Period,” running from three months before to three months after you turn 65. If you miss it and later enroll, you might face late enrollment penalties. You do not need to cancel or suspend your FEHB upon enrolling in Medicare—many retirees maintain both to maximize benefits, depending on their health and financial situation.
How Does Coordination of Benefits Work?
Primary versus secondary payer
When you have both FEHB and Medicare Part B, the two programs coordinate coverage. For most retired federal employees aged 65 or older, Medicare generally pays first. FEHB acts as the secondary payer, covering costs not paid by Medicare, such as some copayments or services not fully covered under Medicare rules. This helps reduce your out-of-pocket expenses but may result in paying premiums for both programs.
Coordination rules under OPM guidance
The Office of Personnel Management (OPM) outlines that if you are retired and enrolled in both FEHB and Medicare Part B, providers bill Medicare first. FEHB then considers the Medicare-allowed amount and may pay for covered charges not paid by Medicare. Some FEHB plans waive deductibles, copayments, or coinsurance if you are enrolled in Part B, but not all plans operate identically. Understanding your plan-specific coordination policies is important for informed decision-making.
What Costs Are Covered by Each?
FEHB coverage responsibilities
FEHB plans typically cover hospital stays, outpatient care, prescription drugs, preventive services, and more. As a retiree, you still pay your FEHB premium, and depending on the service, you may have copayments or coinsurance. If Medicare is your primary payer, FEHB usually pays secondary for services that are also covered by Medicare.
Part B coverage responsibilities
Medicare Part B helps pay for outpatient medical care—think of things like doctor’s appointments, diagnostic tests, and preventive screenings. You pay a monthly premium for Part B. When you have both FEHB and Part B, Medicare pays first for eligible outpatient services, and FEHB covers many remaining costs. For any medical service not covered by either program, you may be responsible for the full cost.
Case Study: Typical Retiree Decision Points
Profile of a sample federal retiree
Let’s consider Jane, a retired federal employee aged 65. She meets the FEHB five-year rule, is eligible for Medicare, and is deciding whether to enroll in Medicare Part B while keeping FEHB.
Coverage scenarios compared
If Jane enrolls in both FEHB and Part B, Medicare will usually pay first when she receives medical services. FEHB will often pay some or all of the remaining balance, potentially leaving Jane with lower out-of-pocket costs but two monthly premiums. If she elects to keep just FEHB and decline Part B, she pays only her FEHB premium, but will be responsible for any FEHB deductible, coinsurance, or copayments. If Jane delays Part B, she may incur a permanent penalty should she enroll later, unless she qualifies for a special enrollment period (such as coverage by other group health insurance through active employment).
What Happens If You Delay Part B?
Enrollment periods and potential penalties
If you do not enroll in Medicare Part B during your Initial Enrollment Period—and do not have other creditable coverage—you may have to pay a higher premium for life if you decide to enroll later. This late enrollment penalty increases for each year you delay. There are some exceptions, such as if you are covered by an employer-sponsored health plan while still actively employed; in that case, you may sign up for Part B later without penalty.
Continuity of coverage considerations
Delaying Part B can result in gaps in coverage, especially if you later lose your other health insurance. By weighing the costs and potential financial risks of both programs, you can help protect yourself from unexpected expenses or penalties down the road.
Should You Keep FEHB After Medicare?
Options for continuing or suspending FEHB
Federal retirees can choose to keep their FEHB coverage after enrolling in Medicare, suspend it (if enrolling in certain other plans), or cancel it. Most retirees keep both FEHB and Medicare to maintain comprehensive health coverage. Suspending FEHB is generally only allowed if you enroll in certain other types of coverage, such as TRICARE or a Medicare Advantage plan. Canceling FEHB is permanent and comes with significant risks, as you cannot re-enroll later.
Considerations for choice
Your decision depends on your health needs, financial situation, and how each program coordinates costs and services. Weigh the value of continued FEHB coverage with Medicare, the premiums for each, and your own comfort with potential out-of-pocket expenses. Reviewing OPM’s official guidance and understanding how your specific FEHB plan coordinates with Medicare can help clarify your options.
