Medicare Guide

Medicare and FEHB

Federal employees and retirees often get better choices than the average Medicare shopper, but that also makes the decision easier to overcomplicate. FEHB can continue into retirement for eligible people, Medicare can coordinate with it, and the best answer usually depends on whether you are still working, whether Medicare is primary, which FEHB plan you have, and whether the extra Part B premium buys enough value.

Reviewed by Jeremy Weiser, Licensed Insurance Agent since 2007 · Published May 15, 2026 · Last updated August 14, 2026

Quick answer

FEHB can work with Medicare, but active employees and retirees have different rules.

Many federal retirees keep FEHB and enroll in premium-free Part A. Part B is the harder decision because it adds a monthly premium, may trigger IRMAA, and may or may not lower out-of-pocket costs enough to justify the extra cost. Active federal employees can often delay Part B while FEHB is primary, but retirees need a more careful review.

Key takeaways

FEHB is separate from Medicare, and eligible federal retirees may generally keep FEHB in retirement.
OPM advises most people who qualify for premium-free Part A to enroll in it when eligible.
Active federal employees usually have FEHB as primary coverage and may be able to delay Part B until retirement.
Retirees with Medicare and FEHB often have Medicare pay first and FEHB pay second for covered services.
Part B can reduce some out-of-pocket costs under certain FEHB plans, but the monthly premium and possible IRMAA still matter.
FEHB prescription coverage is generally creditable, and some FEHB plans now offer Medicare drug benefits accessed through the FEHB plan.
Canceling FEHB as an annuitant can be permanent; suspending FEHB is different and should be handled through the retirement system.

FEHB and Medicare snapshot

The decision is not just Part B yes or no

The better question is what your FEHB plan does when Medicare is primary, whether your doctors and prescriptions fit, whether IRMAA applies, whether a spouse is covered under your enrollment, and whether you would be giving up a benefit you cannot easily get back.

FEHB retirement

Can continueEligible annuitants may generally keep FEHB after retirement.

Part A

Usually $0OPM advises enrolling in premium-free Part A when eligible.

Part B

$202.90/moThis is the 2026 standard premium before any income-related adjustment.

FEHB premium

Still dueOPM says enrolling in Medicare does not reduce or increase your FEHB premium.

Part D

Usually coveredOPM says FEHB drug coverage is creditable, though plan-level Medicare drug benefits may apply.

The parts of Medicare

Start with the four Medicare parts

These are the core building blocks. Once you understand what each part does, the plan choices start to make more sense.

Part AHospital coverage

Inpatient hospital care, skilled nursing facility care, hospice, and some home health care.

Read morePart BMedical coverage

Doctor visits, outpatient care, preventive services, durable medical equipment, and many medical services.

Read morePart CMedicare Advantage

A private-plan way to receive Medicare benefits, with rules and availability that vary by county and plan.

Read morePart DDrug coverage

Prescription drug coverage through stand-alone plans or many Medicare Advantage plans.

Read more

How FEHB and Medicare fit together

OPM explains that active and retired federal employees may be covered by both FEHB and Medicare. FEHB is not a Medicare plan, and Medicare is not an FEHB plan. They are separate coverages that can coordinate. The exact value depends on employment status, retirement status, the FEHB plan brochure, and which parts of Medicare are active.

Part A is usually the easy first step

OPM says most federal employees and annuitants are entitled to Medicare Part A at age 65 without cost, and advises enrolling in premium-free Part A when eligible. Part A can help with inpatient hospital coverage and may reduce some costs that FEHB would otherwise handle. The main exception to slow down for is an HSA: once Medicare starts, you cannot keep contributing to a Health Savings Account.

Part B is where the real comparison starts

Part B covers many doctor visits, outpatient services, preventive services, durable medical equipment, and related medical care. It also adds a monthly premium. Some FEHB plans reduce deductibles, coinsurance, or copays when Medicare is primary. Some offer Part B premium reimbursement. Other plans may not give enough savings to justify the added premium. This is why the answer should come from the specific plan brochure, not from a rule of thumb.

Active employees can often delay Part B

OPM says that for active federal employees, FEHB is primary. An active employee can often defer Part B and use a Special Enrollment Period when employment or employer coverage ends. That can avoid paying Part B premiums while FEHB is already primary. When retirement is approaching, the employing office or retirement system may need to complete CMS-L564 so the Part B enrollment can be handled correctly.

Retirees usually have Medicare as primary

For annuitants with Medicare and FEHB, Medicare is often the primary payer and FEHB is secondary for the person who has Medicare. If a spouse is covered under the retiree's FEHB plan but is not yet eligible for Medicare, FEHB may still be primary for that spouse. A household can have more than one coordination rule at the same time.

FEHB premiums do not go away

OPM says enrolling in Medicare does not reduce or increase your FEHB premium. You keep paying the FEHB premium unless you change plans, change options, suspend FEHB, or cancel FEHB. The financial question is whether the added Medicare premium lowers medical costs, improves access, or reduces risk enough to make the combined premium worthwhile.

IRMAA can change the math

Higher-income retirees may pay more for Part B and Part D because of IRMAA. A federal retiree who is near an IRMAA bracket should compare the full cost, not just the standard Part B premium. A plan that looks attractive at the standard premium may feel different when income-related surcharges apply.

Prescription drug coverage

OPM says most federal employees do not need to enroll in a separate Medicare drug program because FEHB plans have prescription drug benefits that are at least equal to standard Medicare drug coverage. FEHB coverage is generally creditable, so delaying a separate Part D plan usually does not create a Part D penalty as long as FEHB coverage stays in place.

FEHB plans may include Medicare drug benefits

OPM also explains that some FEHB plans automatically enroll eligible members in Medicare drug benefits accessed through the FEHB plan, with no additional cost for that drug benefit. Members may be able to opt out or disenroll, but they should read the plan notice first. Drug formularies, excluded drugs, pharmacies, and out-of-pocket limits can change when Medicare drug benefits are layered into the FEHB plan.

You can only have one Medicare drug path

OPM warns that you may only be covered by one Medicare Part D or Medicare Advantage plan at a time. If you enroll in FEHB-accessed Medicare drug benefits or a Medicare Advantage plan accessed through FEHB, you may lose separate Part D or Medicare Advantage coverage. This is a place to slow down before clicking enroll.

Medicare Advantage through FEHB is different from buying a public plan on your own

Some FEHB carriers offer Medicare Advantage options accessed through the FEHB plan. These plans may include drug coverage and extra benefits, and some may reimburse part or all of the Part B premium. They still need the same review as any Medicare Advantage plan: doctors, hospitals, prescriptions, referrals, prior authorization, travel, service area, and out-of-pocket limits.

Suspending FEHB is not the same as canceling it

OPM says annuitants may have the option to suspend FEHB when enrolling in a Medicare-sponsored plan, Medicaid, CHAMPVA, TRICARE, or certain other coverage. Suspension can allow a future return to FEHB. Canceling FEHB as an annuitant is different and can be permanent. That distinction is too important to handle casually.

Be careful with spouse and family coverage

A retiree's Medicare choice can affect the retiree without affecting a covered spouse in the same way. If one person is Medicare eligible and the other is not, FEHB may coordinate differently for each person. Before changing FEHB enrollment type, joining a Medicare Advantage option, or suspending coverage, check whether a spouse or dependent would lose access, prescriptions, or provider fit.

Postal retirees have PSHB differences

The Postal Service Health Benefits Program is part of FEHB, but OPM notes that PSHB annuitants who retire after January 1, 2025 may have Medicare Part B requirements unless an exception applies. PSHB drug benefits also have consequences if a member opts out. Postal retirees should not assume the general FEHB rule answers the PSHB question.

Changing FEHB when Medicare begins

OPM says becoming eligible for Medicare is a qualifying life event that gives a one-time opportunity to change FEHB enrollment beginning 30 days before Medicare eligibility. Federal retirees can also review plan options during Federal Benefits Open Season. A good review compares the current FEHB plan against other FEHB plans with Medicare coordination, not just against Medicare alone.

What to review before making the Part B decision

Before enrolling in or delaying Part B, review the FEHB plan brochure, Medicare coordination section, Part B premium, IRMAA risk, expected doctor use, outpatient needs, prescriptions, spouse coverage, HSA status, travel, provider network, and whether your FEHB plan offers Part B reimbursement, waived cost sharing, Medicare drug benefits, or an FEHB-accessed Medicare Advantage option.

Coverage paths

The two big Medicare paths people usually compare

The right answer is not the same for everyone. The better question is which path fits the way you use care.

Active federal employees

FEHB is generally primary while you are actively working. Many employees enroll in premium-free Part A and defer Part B until retirement, but HSA and family-coverage details should be checked.

Working Past 65 When to Enroll in Medicare Medicare Part B

Federal annuitants

Retirees often compare FEHB plus Part A against FEHB plus Parts A and B. The plan brochure, Part B premium, IRMAA, provider use, and spouse coverage drive the answer.

Medicare Costs Explained IRMAA Explained How to Choose the Right Medicare Plan

FEHB plan changes

Once Medicare is involved, some FEHB plans waive cost sharing, reimburse part of Part B, add Medicare drug benefits, or offer FEHB-accessed Medicare Advantage options.

Medicare Advantage Medicare Part D Part D Enrollment Periods

Go deeper

Related Medicare guides

Use this page as your Medicare starting point, then jump into the specific topic that matches your situation.

Common questions

Questions people usually ask next

These answers are a starting point. Medicare details can change based on timing, other coverage, and where you live.

Do federal retirees have to drop FEHB when they get Medicare?

No. Eligible federal retirees may generally keep FEHB, and FEHB can coordinate with Medicare.

Should every federal retiree take Part B?

Not automatically. The decision should compare the Part B premium, possible IRMAA, FEHB coordination, expected medical use, plan incentives, provider access, prescriptions, and spouse coverage.

Can an active federal employee delay Part B?

Often yes. OPM says FEHB is primary for active federal employees, and employees may have a Special Enrollment Period for Part B when they stop working or lose employer coverage.

Does FEHB prescription coverage count as creditable drug coverage?

OPM says FEHB provides creditable drug coverage, so people with FEHB generally do not pay a Part D late-enrollment penalty if they delay separate Part D coverage while FEHB remains in place.

Can FEHB work with Medicare Advantage?

Yes, in some cases. Some FEHB plans offer Medicare Advantage options accessed through the FEHB plan. These should be reviewed for doctors, prescriptions, service area, plan rules, extra benefits, and how they affect any separate Part D or Medicare Advantage coverage.

Is suspending FEHB the same as canceling FEHB?

No. Suspension may allow an annuitant to return to FEHB later under OPM rules. Canceling FEHB as an annuitant can be permanent. Check with the retirement system before doing either.

Do PSHB annuitants follow the same rules as FEHB annuitants?

Not always. PSHB is part of FEHB, but OPM notes that some PSHB annuitants have Medicare Part B requirements unless an exception applies. Postal retirees should review PSHB-specific rules.

Can The Medicare Store help compare Medicare and FEHB?

Yes. We can help compare Medicare timing, FEHB plan coordination, Part B costs, IRMAA exposure, prescriptions, spouse coverage, and Medicare Advantage options so the decision is based on the actual numbers and rules.

Official references

Sources checked for this guide

These guides are written in plain English, but the 2026 cost figures and coverage rules should stay tied to official Medicare and CMS source material.

OPM: Medicare and FEHB basics OPM: Coordination of Medicare and FEHB benefits Medicare.gov: Who pays first?Medicare.gov: 2026 Medicare costs Medicare.gov: Part D drug coverage OPM: Active Federal Employee OPM: Annuitant OPM: Medicare Prescription Drug Plan OPM: PSHB Annuitant

About the reviewer

Jeremy Weiser · Licensed Insurance Agent since 2007 · Nevada license #566932

Jeremy Weiser is the CEO and a principal of The Medicare Store and has been a licensed insurance agent since 2007 (Nevada license #566932). With nearly two decades in health and Medicare insurance, he leads the standards behind the guidance The Medicare Store gives every client.

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