Medicare for Federal Employees: Should FEHB Retirees Enroll?

Federal employees and retirees have access to the Federal Employees Health Benefits (FEHB) program — one of the most comprehensive employer-sponsored health coverage systems in the country. When federal retirees turn 65 and become eligible for Medicare, they face a decision that private-sector employees don’t: should they enroll in Medicare Part B (at $185/month or more) when they already have excellent FEHB coverage?

This is one of the most consequential financial decisions federal retirees make, and the answer isn’t simple. It depends on your health, your FEHB plan, your anticipated healthcare usage, and your income.

How FEHB Works for Retirees

FEHB is a voluntary program that continues into retirement for federal employees who:

• Retire from federal service on an immediate annuity
• Were continuously enrolled in FEHB for the 5 years immediately before retirement (or since their first opportunity to enroll)

As a retiree, you continue paying your share of the FEHB premium, which is deducted from your annuity. The government continues to pay its share.

Key FEHB advantages:

• Comprehensive coverage including medical, prescription drugs, and often dental/vision
• Choice of hundreds of plans across four types: Fee-for-Service, HMO, HDHP, and CDHP
• No age-based underwriting — premiums are the same for all enrollees
• Coverage for your whole family, not just yourself

Medicare and FEHB: How They Coordinate

When you have both Medicare and FEHB, coordination of benefits depends on which is primary:

For most retirees, Medicare becomes primary and FEHB secondary. This means:

1. Medicare pays first, up to its coverage limits
2. FEHB pays the remaining cost — often bringing your out-of-pocket to near zero

This coordination is extraordinarily effective at minimizing out-of-pocket costs. Many federal retirees with both Medicare and FEHB pay almost nothing for medical care.

When FEHB is primary: While you’re still working (or if you’re an active federal employee), FEHB is primary and Medicare is secondary. The rules are similar to other employer plans — see our guide on Medicare vs. employer insurance at 65.

The Core Question: Is Part B Worth $185+/Month?

This is the central debate among federal retirees. You’re already paying for FEHB. Is it worth adding another $185/month (or more with IRMAA surcharges) for Part B?

Arguments FOR enrolling in Part B:

1. Reduced FEHB premiums: Many FEHB plans offer significantly reduced premiums (or even no premiums for Medicare Primary plans) when you have Medicare as primary. The premium savings can exceed the Part B premium cost.

2. Near-zero out-of-pocket costs: With Medicare paying first and FEHB picking up the remainder, your actual healthcare costs can drop to essentially nothing beyond your premiums.

3. Access to Medicare-specific benefits: Some services, including certain preventive care, may be covered under Medicare Part B that FEHB might handle differently.

4. Simplified billing: Medicare + FEHB coordination often means providers handle billing more efficiently than FEHB alone.

5. Protection against FEHB plan changes: If the government reduces FEHB benefits in the future, Medicare acts as a safety net.

Arguments AGAINST enrolling in Part B:

1. Premium cost: $185/month ($2,220/year) is real money, and more if you face IRMAA surcharges.

2. FEHB may cover most gaps already: Many comprehensive FEHB plans cover nearly everything Medicare would, making the incremental benefit of Part B small.

3. Healthy individuals rarely hit coverage limits: If you rarely use healthcare, the out-of-pocket protection of dual coverage may not justify Part B’s cost.

4. You can’t un-pay premiums: Years of Part B premiums paid for little benefit are gone.

FEHB Medicare-Primary Plans: A Game Changer

The Office of Personnel Management (OPM) has encouraged FEHB plans to offer Medicare Primary plans — FEHB options specifically designed for retirees who have Medicare. These plans:

• Have lower employee premiums (sometimes $0/month for self-only enrollment)
• Coordinate seamlessly with Medicare Part A and B
• May offer enhanced benefits beyond Original Medicare

If you enroll in Part B and your FEHB plan offers a Medicare Primary option, you might find that the premium savings on FEHB eliminate or exceed the cost of Part B — making the combination economically beneficial.

In 2023, OPM began transitioning to the Postal Service Health Benefits (PSHB) program for Postal Service employees specifically, with mandatory Medicare Part B enrollment required for most annuitants under 65. Other federal agencies are unaffected.

Enrollment Deadlines for Federal Employees

If you retire at 65 or later: Enroll in Part B during your 7-month Initial Enrollment Period (IEP) around your 65th birthday. Your FEHB coverage qualifies as employer coverage, so you have an 8-month Special Enrollment Period (SEP) from the date your federal employment ends if you delay.

If you retire before 65: Continue with FEHB only until you turn 65, then enroll in Part B during your IEP.

Critical: FEHB in retirement does qualify as creditable employer coverage for Medicare SEP purposes — you will not face a late enrollment penalty if you enroll when you retire, even past 65. But you must enroll within 8 months of losing your employer coverage status.

Do not wait for the General Enrollment Period if you miss your IEP or SEP — you’d pay a permanent Part B late enrollment penalty.

Federal Long-Term Care Insurance Program (FLTCIP)

Separate from FEHB, federal employees and retirees have access to the Federal Long-Term Care Insurance Program (FLTCIP) administered by John Hancock. This program offers long-term care insurance with:

• Group underwriting (historically more lenient than individual market)
• Portable coverage (continues after leaving federal service)
• Several plan options (benefit periods, daily benefit amounts, inflation protection)

FLTCIP enrollment was suspended in 2022 for new applicants while OPM and the insurer work through actuarial issues — check the OPM website for current enrollment availability. Existing policyholders maintain their coverage.

For the broader context of long-term care planning and what Medicare doesn’t cover, see our guide to long-term care insurance.

Medicare Part D and FEHB

Most FEHB plans include prescription drug coverage that is considered creditable coverage — equal to or better than Medicare Part D. This means:

• You generally do not need to enroll in a separate Part D plan while enrolled in FEHB
• You won’t face a Part D late enrollment penalty if you enroll later when leaving FEHB
• Some FEHB Medicare Primary plans include Part D drug coverage as part of a Medicare Advantage framework

If you’re considering dropping FEHB to reduce costs, make sure you have Part D coverage before doing so — and know that you cannot easily re-enroll in FEHB once you drop it (reinstatement is limited).

Can You Drop FEHB After Enrolling in Medicare?

Yes, but carefully. Some federal retirees with both Medicare and an FEHB plan with high premiums consider dropping FEHB to save money. This is a high-stakes decision:

Pros of dropping FEHB:

• Eliminate FEHB premiums, often $200–$800+/month for comprehensive coverage
• Original Medicare + a Medigap plan may be cheaper and offer equivalent coverage

Cons of dropping FEHB:

• You generally cannot re-enroll in FEHB after voluntarily dropping it in retirement
• If you drop FEHB and lose Medicare coverage (e.g., through some error or if legislation changes Medicare), you’d be uninsured
• FEHB often covers things Medicare doesn’t: dental, vision, hearing (in some plans)
• FEHB drug coverage may be superior to Part D for your specific medications

The permanent nature of this decision warrants careful analysis. If you’re considering it, consult a benefits specialist familiar with federal retirement benefits before dropping FEHB.

TRICARE and Medicare: For Military Retirees

Military retirees have TRICARE rather than FEHB. TRICARE rules for Medicare interaction are different:

• At 65, TRICARE beneficiaries must enroll in Medicare Part B to retain TRICARE benefits
• TRICARE becomes secondary to Medicare
• TRICARE for Life (TFL) provides wraparound coverage similar to Medigap

This is not optional for military retirees — failing to enroll in Part B at 65 means losing TRICARE coverage.

Summary: Federal Retiree Medicare Decision Framework

Key Takeaways

• Federal retirees can keep FEHB in retirement as long as they were covered for 5 years before retiring
• With both Medicare and FEHB, Medicare is primary and FEHB pays the remaining costs — out-of-pocket costs often approach zero
• The value of Part B depends on your FEHB plan’s Medicare Primary option, your health, and your Part B premium (including any IRMAA surcharge)
• FEHB qualifies as creditable employer coverage — no Part D penalty risk while enrolled
• Dropping FEHB in retirement is generally permanent; weigh this decision extremely carefully
• TRICARE beneficiaries must enroll in Part B at 65 or lose TRICARE
• For detailed Medicare enrollment period rules, see our Medicare enrollment periods guide