FEHB vs. Medigap (2026–2027): Before You Drop Coverage
Bottom Line
Medigap may duplicate FEHB benefits when your retiree plan waives Medicare cost-sharing. Canceling FEHB in retirement generally prevents reenrollment; suspending it for Medicare Advantage preserves a return option, so confirm the consequences before buying Medigap.
Compare what your existing FEHB plan pays after Medicare before adding Medigap or changing retiree coverage. Canceling annuitant FEHB generally prevents reenrollment; an approved suspension for qualifying coverage preserves a return option. Identify whether you have regular FEHB, postal PSHB or another program first. If you are also considering life insurance, guaranteed universal life rates are a separate financial decision, unrelated to Medicare or FEHB enrollment.
Why This Comparison Matters
FEHB and Medigap do different jobs. FEHB is your employer-based retiree health plan, administered under rules from the Office of Personnel Management. Medigap (Medicare Supplement) is private insurance that fills gaps in Original Medicare, such as copayments, coinsurance, and deductibles. Because Medicare generally pays first for retirees after you or your spouse’s employment ends, your retiree coverage often behaves like a supplement already — which is why comparing retiree health benefits with Medicare options starts with identifying your actual employer system before you discuss coordination or the consequences of dropping it.
Medicare.gov notes that when you have Medicare and retiree coverage from a former employer, Medicare pays first and your retiree plan is billed second. Your retiree plan may even be structured like a Medigap policy, filling in coinsurance and deductibles. That means buying a separate Medigap policy on top of FEHB could duplicate benefits you already have.
How FEHB and Medicare Work Together
Several FEHB–Medicare rules come directly from OPM guidance:
- Coordination of benefits. Many FEHB plans waive their deductibles, coinsurance, and copayments for services when Medicare is primary. Some plans also reimburse all or part of your Part B premium.
- Broader provider access. If you are in an FEHB HMO, Medicare being primary can let you go outside the HMO network for Part B services and be reimbursed by Medicare when the provider accepts Medicare.
- Part D through FEHB. FEHB provides creditable drug coverage, so you will not owe a Part D late enrollment penalty for deferring Part D as long as you keep FEHB. Many FEHB plans also offer Medicare drug benefits through the plan itself, often at no additional premium.
- Premiums. Enrolling in Medicare does not change your FEHB premium. Part B premiums can be deducted from your Social Security benefit, from your federal annuity, or billed directly.
- Tell your plan. When you enroll in Medicare, notify your FEHB plan so claims are paid correctly.
OPM also points out a real coverage gap: some Part B services — durable medical equipment, orthopedic and prosthetic devices, home health care, and medical supplies — may be covered only partially or not at all by your FEHB plan. Medicare can fill those holes. Check your plan brochure for specifics.
The Critical Difference: Canceling vs. Suspending FEHB
This is the single most consequential distinction for federal annuitants, and it comes straight from OPM rules:
- Canceling annuitant FEHB generally prevents reenrollment. An ordinary open season does not restore canceled annuitant coverage. Limited circumstances, such as qualifying federal reemployment, can differ; ask your retirement system before relying on an exception.
- Suspending FEHB for a Medicare Advantage plan is reversible. If you suspend FEHB to enroll in a Medicare Advantage plan offered by Medicare, you may reenroll during the annual Federal Benefits Open Season or after a qualifying life event (QLE).
So the phrase “dropping FEHB” covers two very different actions. If a Medicare Advantage plan looks attractive, the reversible route is suspension. If you simply stop paying your FEHB premium or formally cancel, you have given up the coverage for good — including coverage for a spouse who may not yet be Medicare-eligible, since FEHB stays primary for a spouse who is not yet entitled to Medicare.
Self Only covers only you. It does not preserve coverage for a spouse or child. Before reducing, canceling or suspending enrollment, ask the retirement system how the action affects every family member, survivor rights and any later return opportunity. Review the actual alternative benefits and obtain written confirmation of the applicable rules.
When a Medigap Policy Actually Makes Sense
You need Part A and Part B to buy a Medigap policy. Your one-time Medigap Open Enrollment Period is the six months that begins the first day of the month you are 65 or older and enrolled in Part B. During that window, insurers cannot use health to deny an offered Medigap policy for which you are eligible and cannot charge more for health problems. Outside that window, there is no federal guarantee that an insurer will sell you a policy or that it will be affordable — although some states provide additional rights under state law, so check with your State Insurance Department.
Timing matters if you are deferring Part B while working. If you have FEHB while still employed (or your spouse does), that coverage often provides benefits similar to Medigap, and you can sign up for Part B later without a late enrollment penalty under a Special Enrollment Period. After employment or the group health coverage based on that current employment ends, whichever happens first, you generally have eight months to sign up for Part B without the late penalty, and your federal Medigap Open Enrollment Period begins the first month you are 65 or older and Part B is effective.
But here is the key question for a federal retiree: what would Medigap add that FEHB does not already provide? If your FEHB plan waives cost-sharing when Medicare is primary, a Medigap policy may largely duplicate that. If your FEHB plan has significant cost-sharing even with Medicare, or you want guaranteed-for-life standardized Medigap benefits, a policy could be worth it. When weighing Medigap premiums against coverage, list what your FEHB plan leaves uncovered after Medicare pays, estimate how often you use those services, and compare that total to the Medigap premium. Additional insurance is not automatically necessary — it is a value judgment based on your actual plan’s gaps.
Also remember what Medigap does not cover: long-term care, vision, dental, hearing aids, glasses, and private-duty nursing. Medigap policies sold after 2005 do not include drug coverage; you would use a separate Part D plan, but keeping FEHB means FEHB provides creditable drug coverage without extra cost in many cases.
Special Situations to Verify Before You Decide
Postal retirees and PSHB
If you are a Postal Service annuitant, your coverage is under the Postal Service Health Benefits (PSHB) Program, not ordinary FEHB, and the rules differ. OPM states that postal annuitants who retire and become entitled to Medicare Part A — and their family members entitled to Part A — are generally required to enroll in Medicare Part B as a condition of PSHB eligibility, with some exceptions. That changes the entire Part B analysis. Before making any election, confirm your specific Part B requirement; when Medicare Part B decisions for postal retirees come up, treat PSHB as its own system rather than assuming regular FEHB rules apply.
TRICARE For Life
If you (or a family member you help) also have TRICARE For Life, the Medigap question changes again. TRICARE For Life works as wraparound coverage for Medicare beneficiaries — Medicare pays first, then TFL pays much of what remains. That means an additional Medigap policy would largely duplicate TFL’s wraparound function, adding little. If you are weighing whether Medigap adds value to TRICARE For Life, examine specifically what a policy would cover that TFL does not before paying a second premium.
Retiring before 65 or with fewer than five years of service
Continuing FEHB into retirement requires retiring on an immediate annuity from a qualifying civilian retirement system (such as CSRS or FERS) and having been continuously enrolled in FEHB for the five years immediately before retirement, or since your first opportunity to enroll. If you elect not to enroll or to cancel, you must certify on the SF 2809 that you understand this affects your ability to carry coverage into retirement. If you postpone your annuity (for example, under MRA+10), your FEHB enrollment terminates at separation and you would resume coverage when the annuity starts.
The Penalty Risk of Getting Part B Wrong
If no enrollment protection applies, delaying Part B can result in a penalty of 10% for each full 12-month period you could have had it, generally for as long as you have Part B. Current-employment coverage can provide a Special Enrollment Period, but retiree FEHB alone does not protect a delay indefinitely. Regular FEHB continues with or without Medicare; PSHB has separate Part B requirements. Compare benefits and penalties before deciding.
For most federal retirees, FEHB being primary while working means deferring Part B is often fine — but once FEHB becomes secondary (after retirement), the calculus changes. If you deferred Part B, use the Special Enrollment Period: ask your former employing agency or benefits office to complete the employer section of form CMS-L564 to document employment and coverage. If the employer cannot complete it, Social Security accepts alternative evidence of employment-based coverage, such as pay stubs showing insurance deductions. Apply within your enrollment window and confirm your Part B start date.
For HSA contributions, work backward from the actual Medicare effective month. Premium-free Part A after 65 can be retroactive by up to six months, but not before eligibility. Stop contributions for Medicare-covered months and calculate the final annual limit; a six-month pause is not automatically required before enrollment at 65.
A Practical Decision Checklist
- Confirm your system. Regular FEHB, PSHB, TRICARE, VA, or a non-federal retiree plan — each coordinates with Medicare differently.
- Read your plan brochure. Does your FEHB plan waive cost-sharing when Medicare is primary? Does it reimburse the Part B premium? Where does it leave gaps (DME, home health, supplies)?
- Decide on Part B. Confirm which coverage will pay first and what it pays without Medicare. A current-employment enrollment protection and retiree coordination are separate questions. Verify any postal PSHB requirement or exception.
- Never cancel FEHB casually. Suspension (for a Medicare Advantage plan) is reversible; cancellation as an annuitant is not.
- Price the Medigap alternative honestly. Get Medigap quotes for the plans available in your state during your enrollment window, compare them to what your FEHB plan leaves uncovered, and only buy if the policy adds real value.
- Use free help. Your State Health Insurance Assistance Program (SHIP) offers free, unbiased advice on whether a Medigap policy makes sense alongside retiree coverage; find yours at shiphelp.org.
This decision is one piece of a bigger picture — how you plan Medicare around work and retirement shapes your premiums, provider access, and spouse coverage for decades. Taking the time to verify each rule against your own enrollment before you sign anything is the difference between a smooth transition and an irreversible mistake.
Next Step
Prepare for your comparison the same way a benefits counselor would: pull your most recent FEHB or PSHB plan brochure, note your plan’s cost-sharing when Medicare is primary, confirm your Part B status or deadline, and request Medigap quotes for the plans sold in your state. Compare both totals — FEHB plus Medicare versus Medigap plus Medicare — against your expected care needs for the next several years, and never cancel annuitant coverage until you have confirmed, in writing, what you can and cannot restore later.