FEHB After Retirement: How to Keep Your Federal Health Coverage

For most federal retirees, FEHB (Federal Employees Health Benefits) is the single most valuable benefit they carry into retirement — more valuable, dollar-for-dollar, than the FERS annuity itself. A typical FEHB family plan in 2024 costs $1,800–2,400/month, of which the retiree pays only 28% — saving $1,300–1,700/month compared to buying equivalent coverage on the ACA marketplace. Over a 25-year retirement, that is $400,000–500,000 in subsidized health insurance. Yet FEHB continuation into retirement is governed by some of the strictest rules in federal benefits law, codified at 5 USC § 8905 and § 8905a and implemented at 5 CFR § 890. This guide walks through the 5-year rule, premium sharing in retirement, the FEHB-Medicare coordination at 65, FEHB-TRICARE coordination for military retirees, surviving spouse continuation, and the irreversible decisions that trip up retirees who do not understand them.

The 5-year rule and the "first opportunity" exception

The foundational rule for FEHB continuation into retirement is the 5-year rule at 5 USC § 8905(b)(1), implemented at 5 CFR § 890.302(a). To continue FEHB coverage into retirement, you must have been enrolled (or covered as a family member) in FEHB for the 5 years of service immediately before the date your annuity starts, OR for the full period(s) of service since your first opportunity to enroll, whichever is shorter.

Three things to internalize about the 5-year rule:

• The clock runs backward from your annuity commencing date. If you retire on July 1, 2025, the 5-year window runs from July 1, 2020, to June 30, 2025. Any gap during that window — even a single day during an Open Season transition — can disqualify you.
• You must be the enrollee, not just a family member. If your spouse is the federal employee and you are covered as a family member on their FEHB, that coverage does not satisfy your own 5-year rule if you later become a federal employee. But if you are the enrollee and cover your spouse, that satisfies your rule.
• "First opportunity" means the first Open Season or qualifying life event after you became eligible. If you became eligible in 2018 but did not enroll until 2024, your 5-year window does not start until 2024 — you cannot retire with FEHB continuation before 2029 unless an exception applies.

Exceptions to the 5-year rule exist under 5 CFR § 890.302(b) and (c). The most common are:

• Military activation. Time spent on active duty military service while a federal employee counts toward the 5-year window if you re-enroll in FEHB within 60 days of release from active duty.
• Conversion from CSRS to FERS in 1987 — many employees who converted under the Federal Employees' Retirement System Act of 1986 received credit for prior FEHB enrollment.
• Spousal equity elections for former spouses under 5 USC § 8905(b)(2) — a narrow exception.

The 5-year rule is not curable retroactively. If you arrive at retirement with only 4 years and 11 months of FEHB enrollment, OPM will deny continuation. The only fix is to delay retirement until you complete 5 full years — a costly but unavoidable outcome.

Premium sharing in retirement: the 72% rule

Under 5 USC § 8905(d) and 5 CFR § 890.301, the government's share of FEHB premiums continues into retirement at the same rate as for active employees. The statutory formula is the "weighted average" — the government pays 72% of the weighted average premium across all FEHB plans, capped at 75% of any specific plan's premium. The retiree pays the remaining 28% (or up to 25% minimum, in some plans).

In practice, the government share varies by plan:

Premium figures are illustrative — actual rates vary by plan and are published annually by OPM at OPM.gov. The government share is calculated as 72% of the weighted average, but the statute caps the government contribution at 75% of any one plan's premium — so plans priced below the weighted average receive a higher effective subsidy.

Premiums are deducted from your FERS annuity. If your annuity is too small to cover the premium (rare but possible for MRA+10 retirees with deep reductions), you can pay premiums directly to OPM via Services Online. Unlike active employees, retirees pay premiums monthly rather than biweekly — the deduction happens at the end of each month.

OPM reports that the average FEHB family plan premium in 2024 is approximately $2,050/month. The retiree pays about $575 of that; the government pays $1,475. Over a 25-year retirement, the government's contribution totals approximately $442,500 — a benefit many retirees fail to fully appreciate.

Plan choices that matter in retirement

FEHB offers over 200 plan options during Open Season, but retirees should focus on the structural categories because the plan type drives how Medicare coordinates at 65 and how out-of-pocket costs behave as you age.

• Fee-for-Service (FFS) PPO plans — Blue Cross Blue Shield Standard, GEHA Standard, Mail Handlers. These plans offer nationwide networks, no referrals required, and typically coordinate with Medicare as primary after age 65. Best for retirees who travel or split time between states.
• Health Maintenance Organizations (HMOs) — Kaiser, Aetna HMO, BCBS HMO. Lower premiums and lower out-of-pocket costs within the network, but no coverage outside the service area except emergencies. Best for retirees who stay local and want predictable costs.
• High Deductible Health Plans (HDHPs) with HSA — GEHA HDHP, Aetna HDHP. Lower premiums, higher deductibles (typically $1,500–2,500 individual), paired with a Health Savings Account. Best for healthy retirees who want to bank tax-free savings for future medical expenses. Critical caveat: you cannot contribute to an HSA after enrolling in Medicare Part A or Part B — see IRS Publication 969.
• Consumer-Driven Health Plans (CDHPs) — Aetna CDHP, MHBP CDHP. Similar to HDHP but with a Health Reimbursement Arrangement (HRA) instead of an HSA. The HRA is funded by the plan, not by you, and is not portable if you leave FEHB.

Retirees can change plans during Open Season (mid-November to mid-December) without medical underwriting — there are no pre-existing condition exclusions in FEHB. This is one of FEHB's most powerful features: a retiree can carry a low-cost HDHP in healthy years and switch to a comprehensive FFS plan after a diagnosis, without penalty.

Medicare Part A at 65: it is free for most

Medicare Part A (hospital insurance) is premium-free for anyone who has worked 40 quarters (10 years) in Social Security-covered employment, or who is entitled based on a spouse's work record. Most federal employees easily clear this bar — even a 20-year FERS career produces 80 quarters. Premium-free Part A is automatic at age 65 if you are already receiving Social Security; otherwise you enroll through ssa.gov/medicare.

Should you enroll in Part A at 65 even if you are still working and enrolled in FEHB? Almost always yes. Premium-free Part A is a no-brainer: it adds a layer of hospital coverage at no cost, and it can serve as a secondary payer if you have group health coverage through continued employment (under the Medicare Secondary Payer rules at 42 USC § 1395y(b)).

For retirees already drawing a FERS annuity (not employed), Part A is even more clearly beneficial. It coordinates with FEHB as primary for hospital stays, reducing FEHB's out-of-pocket exposure. There is essentially no scenario where a 65+ retiree with FEHB should decline premium-free Part A.

One exception: if you are still contributing to an HSA through an HDHP, enrolling in Part A disqualifies you from HSA contributions (IRS Publication 969). Many pre-65 retirees delay Part A to keep HSA contributions going, then enroll in Part A at the point they stop HSA contributions.

Medicare Part B: to enroll or not?

Medicare Part B (medical insurance) carries a premium — $174.70/month in 2024 for most enrollees, with higher premiums for higher-income retirees under the Income-Related Monthly Adjustment Amount (IRMAA). IRMAA surcharges kick in at modified adjusted gross income above $103,000 (individual) or $206,000 (couple) and can push Part B premiums to $594/month at the highest bracket.

The decision to enroll in Part B when you have FEHB is the most-debated question in federal retirement planning. The answer depends on your FEHB plan and your health:

If you enroll in Part B late — outside your Initial Enrollment Period (the 7-month window around your 65th birthday) — you face a 10% surcharge for each 12-month period of delay, permanently. The General Enrollment Period runs January 1 to March 31 each year, with coverage beginning July 1.

Special Enrollment Period: if you or your spouse are still actively employed and covered under a group health plan, you can delay Part B without penalty and enroll later during a Special Enrollment Period (any time while covered, or within 8 months of losing coverage). This is critical for working spouses of federal retirees.

How FEHB and Medicare coordinate at 65+

When you have both FEHB and Medicare, coordination depends on whether you are still working. For retirees (no active employment), the rules are:

• Medicare is primary. Medicare pays first on all claims.
• FEHB is secondary. FEHB pays after Medicare, typically covering deductibles, coinsurance, and copayments that Medicare does not.
• For prescription drugs: FEHB's prescription drug coverage is "creditable" — meaning it is at least as good as Medicare Part D — so you do not need to enroll in Part D. Doing so would be redundant. FEHB plans typically cover prescriptions with lower copays than standard Part D formularies.

Most FEHB FFS plans waive their deductibles, copays, and coinsurance when Medicare is primary. This is the "waiver of cost-sharing" provision in the FEHB brochure — check your plan's brochure for the exact language. The result is that, for most retirees, having both FEHB and Medicare Parts A+B produces near-zero out-of-pocket medical costs.

Worked example: a 70-year-old retiree with BCBS Standard and Medicare Parts A+B is hospitalized for 5 days. Medicare Part A covers the hospital stay (after a $1,632 deductible in 2024). BCBS Standard waives the deductible because Medicare paid. The retiree pays $0. The same hospitalization without Part B coordination might leave the retiree with $1,500–2,500 in out-of-pocket costs under FEHB alone.

Prescription drug coordination is one of FEHB's most underrated features. FEHB plans are required to send an annual Notice of Creditable Coverage confirming that their drug benefit is at least as good as Part D. Keep this notice — if you ever leave FEHB, you'll need it to enroll in Part D without penalty.

FEHB and TRICARE for military retirees

Federal employees who are also military retirees (20+ years of service or medically retired) often have access to TRICARE. The coordination between FEHB and TRICARE depends on whether you are actively employed or retired:

• While employed (active duty or retired military): TRICARE pays after FEHB. FEHB is primary, TRICARE is secondary. Many military retirees keep FEHB as primary because the network is broader.
• At age 65 (with TRICARE for Life): Medicare becomes primary, TRICARE for Life becomes secondary, and FEHB becomes tertiary. TRICARE for Life requires Medicare Parts A and B — without Part B, you lose TRICARE for Life.

The decision for military retirees is whether to keep FEHB at all once they have TRICARE for Life. TRICARE for Life alone, with Medicare as primary, provides near-comprehensive coverage — but FEHB adds value in three ways:

1. Prescription drug coverage. TRICARE's pharmacy benefit (Express Scripts) has narrower formularies than most FEHB plans.
2. Surviving spouse coverage. A surviving spouse loses TRICARE if the military retiree dies (unless they qualify under the Survivor Benefit Plan). FEHB continuation provides backup coverage.
3. Coverage outside military treatment facilities. TRICARE for Life relies on Medicare-accepting providers; FEHB provides access to additional networks.

Many military retirees suspend FEHB at 65 (under 5 CFR § 890.1102 — but note that this rule was effectively repealed for federal retirees by the Federal Employees Health Benefits Improvement Act of 1990; you cannot suspend FEHB and later re-enroll). The correct planning move is to keep FEHB through retirement if you can afford it, and coordinate with TRICARE for Life at 65.

Surviving spouse FEHB continuation

A surviving spouse can continue FEHB coverage after the annuitant's death if and only if both conditions are met under 5 USC § 8905(b)(1) and 5 CFR § 890.503:

1. The annuitant was enrolled in a Self Plus One or Self and Family FEHB plan at the time of death, AND
2. The annuitant had elected a survivor annuity (at least 25% under FERS, or any amount under CSRS) for that spouse.

If both conditions are met, the surviving spouse continues the same FEHB plan, with the same premium share (approximately 28%), for life — or until remarriage before age 55 (a remarriage at 55+ does not disqualify). The surviving spouse can change plans during Open Season and can switch from Self and Family to Self Only if no other family members remain eligible.

If either condition fails:

• Self Only enrollment at death: the surviving spouse cannot continue FEHB. They may be eligible for Temporary Continuation of Coverage (TCC) under 5 USC § 8905a — but TCC lasts only 36 months and requires the surviving spouse to pay 102% of the premium (full premium plus 2% administrative fee). For a typical plan, this is $2,000–2,500/month — often unaffordable.
• No survivor annuity: the surviving spouse has no "annuitant" status with OPM and therefore cannot continue FEHB. TCC may be available, but again at 102% premium for 36 months.

This is one of the most catastrophic planning failures in federal retirement. The fix is simple and inexpensive: elect at least a 25% survivor annuity (a 5% reduction in the employee's annuity) and maintain Self Plus One or Self and Family FEHB enrollment through death. Yet many retirees switch to Self Only after children age out, forgetting that the surviving spouse will lose coverage.

Open Season, cancellation, and the irreversibility trap

Retirees can change FEHB plans during the annual Open Season (mid-November to mid-December) without medical underwriting — there are no pre-existing condition exclusions in FEHB. Changes take effect January 1 of the following year and can be made through Services Online or by mailing Form RI 79-9 to OPM. What you can change: enrollment code (switch plans), plan type (FFS to HMO to HDHP), or coverage level (Self Only to Self Plus One). What you cannot change: re-enroll after cancellation (unless a special Open Season is announced, which OPM has done about once per decade), or add a family member who is not otherwise eligible.

Under 5 CFR § 890.304(a), an annuitant can cancel FEHB enrollment at any time — but cancellation is generally permanent. You cannot re-enroll later, except during a limited Open Season window that OPM has historically offered only rarely. Compare this with active employees, who can cancel and re-enroll freely during Open Seasons. The few exceptions allowing re-enrollment after cancellation include marriage or divorce (within 60 days), loss of other health coverage (within 60 days), or OPM-announced special Open Seasons.

Why this matters: many retirees at 65 consider dropping FEHB because Medicare + a Medigap policy appears cheaper. The math usually does not work. A Medigap Plan G policy at 65 costs $150–250/month, plus Part B at $174.70 — total $325–425/month. FEHB at the retiree share of $175–575/month seems comparable. But FEHB covers prescription drugs (Medigap does not — you would need Part D, adding $30–80/month), FEHB covers the surviving spouse (Medigap is individual-only), FEHB has no medical underwriting (Medigap rates rise with age and health), and if you drop FEHB, you cannot get it back — locking you out of the survivor protection. For almost all federal retirees with a spouse, the right move is to keep FEHB into retirement and through age 65.

Worked example: a 65-year-old retiree with FEHB + Medicare

Consider a 65-year-old FERS retiree with BCBS Standard (Self Plus One), $200,000 modified adjusted gross income, and a 63-year-old spouse. The retiree is approaching Medicare eligibility and weighing options.

Option 1: FEHB only (decline Medicare Part B).

• FEHB Self Plus One premium: $350/month (retiree share, 28%).
• Out-of-pocket costs: deductible ($350 individual / $700 family), then 15% coinsurance on most services, up to a $5,000 catastrophic cap.
• Annual cost: $4,200 premiums + ~$2,500 typical out-of-pocket = $6,700/year.
• Spouse has no Medicare until 65 — they remain on FEHB.

Option 2: FEHB + Medicare Part B (retiree enrolls, spouse waits until 65).

• FEHB premium: $350/month.
• Medicare Part B: $174.70/month (no IRMAA at $200,000 MAGI; threshold is $206,000 couple).
• Out-of-pocket for retiree: ~$0 (FEHB waives cost-sharing when Medicare is primary).
• Out-of-pocket for spouse (still on FEHB, no Medicare): ~$2,500/year typical.
• Annual cost: $4,200 FEHB + $2,096 Part B + $2,500 spouse OOP = $8,800/year.

Option 2 costs more annually but provides substantially better coverage for the retiree (near-zero out-of-pocket) and protects against catastrophic costs that FEHB alone might not fully cover. The Part B premium is locked in at $174.70 (adjusted annually for inflation), and the spouse can add Part B at 65 to gain the same coordination.

Option 3: Cancel FEHB, enroll retiree in Medicare + Medigap Plan G.

• Medicare Part B: $174.70/month.
• Medigap Plan G: ~$200/month at age 65 (varies by state; will rise with age).
• Part D drug plan: ~$40/month.
• Spouse (63, no Medicare yet): must buy ACA marketplace coverage at ~$600/month after subsidies (varies by income).
• Annual cost: $2,096 + $2,400 + $480 + $7,200 spouse = $12,176/year.
• And — critically — FEHB is gone. The surviving spouse loses FEHB if the retiree dies first.

Option 3 is dramatically more expensive and removes the survivor protection. This is the textbook case for keeping FEHB through retirement.

Common FEHB mistakes in retirement

After decades of helping federal retirees navigate FEHB, the patterns are well-documented:

• Switching to Self Only after children age out. The spouse loses FEHB if the retiree dies first. Keep Self Plus One.
• Canceling FEHB at 65 to save premiums. The math rarely works once you factor in Medigap, Part D, and the loss of survivor coverage.
• Missing the 5-year rule. Even a 1-day gap disqualifies continuation. Verify enrollment history at Month 7 of the retirement countdown.
• Declining premium-free Part A. Almost always a mistake — Part A adds hospital coverage at no cost and coordinates with FEHB.
• Enrolling in Part D when FEHB already covers prescriptions. FEHB plans are "creditable" coverage; Part D is redundant and adds cost.
• Continuing HSA contributions after Part A enrollment. Triggers IRS penalties (6% excise tax on excess contributions). Stop HSA contributions the month before Part A begins.
• Forgetting to update FEHB after a divorce or remarriage. A former spouse removed from FEHB loses coverage; a new spouse must be added within 60 days of marriage.
• Not notifying OPM of a death. Surviving spouses have 30 days to elect continued FEHB coverage — missing this window can mean losing the right to continue.

Takeaways

FEHB in retirement is the federal government's most valuable post-employment benefit, worth hundreds of thousands of dollars in subsidized premiums over a typical retirement. The 5-year rule is non-negotiable: verify your enrollment history before retirement and do not let any gap develop in the final 5 years. Premium sharing continues at the same ~72/28 ratio as for active employees, deducted from your FERS annuity. At 65, premium-free Medicare Part A is essentially mandatory, and Part B is strongly recommended for most retirees with FFS plans — the coordination produces near-zero out-of-pocket medical costs. Do not cancel FEHB to save premiums; the math rarely works and the survivor protection alone justifies the cost. Keep your FEHB enrollment at Self Plus One or Self and Family through death so your surviving spouse can continue coverage. Avoid the common mistakes — most are irreversible and many cost surviving spouses the health coverage they were counting on.