Healthcare decision guide · Reviewed September 5, 2026
FEHB or Medicare Part B After Federal Retirement?
You can keep Federal Employees Health Benefits (FEHB) coverage in retirement without enrolling in Medicare Part B. Part B is an optional second layer: it adds a separate premium, usually pays first for retired annuitants, and may reduce cost sharing under some FEHB plans. The right choice depends on your plan, income, providers, expected care, and household coverage.
What is the short answer?
The U.S. Office of Personnel Management (OPM) says your FEHB coverage continues whether or not you enroll in Part B. If a retired annuitant has Medicare, Medicare generally pays first and FEHB pays second; your FEHB premium does not decrease. That makes this a value decision, not a requirement to replace FEHB.
| Decision factor | FEHB only | FEHB + Part B |
|---|---|---|
| Premiums | Continue paying FEHB premium | Pay FEHB premium plus Part B premium and any IRMAA |
| Claims after retirement | FEHB pays under its plan rules | Medicare generally pays first; FEHB generally pays second |
| Providers | Use the FEHB plan network and rules | Medicare participation plus the FEHB plan’s coordination rules matter |
| Cost sharing | Plan deductible, copays, and coinsurance apply | Some FEHB plans waive or reduce cost sharing; verify the plan brochure |
| Household | FEHB can continue covering eligible family members | Part B is individual; each spouse makes a separate enrollment decision |
How do FEHB and Medicare coordinate after retirement?
For an annuitant, OPM states that Medicare is the primary payer when the retiree or covered spouse has Medicare, and FEHB is secondary. Primary means Medicare processes a covered claim first; secondary does not mean FEHB automatically pays every remaining dollar. Your FEHB plan brochure controls deductibles, copays, network rules, and what it waives when Medicare is primary.
Current federal employees are different: Medicare’s coordination guidance says FEHB generally pays first for an active federal employee. Confirm which status applies on the date care is received, especially when one spouse is still working.
What costs should you compare?
Part B costs: 2026 confirmed, 2027 pending
CMS has not yet announced the 2027 Part B premium, deductible or income-related surcharges. It usually does in November. The 2026 figures below stay in effect through December 31, 2026. This page will be updated when the 2027 figures are published.
The Centers for Medicare & Medicaid Services (CMS) set the standard 2026 Part B premium at $202.90 per person per month and the annual deductible at $283.00. Rates change annually.
Plan-specific value
Compare your FEHB premium, expected deductible and copays, prescription coverage, out-of-network needs, and any Medicare coordination benefits or Part B reimbursement listed in the official plan brochure. FEHB premiums do not fall merely because you add Part B.
FEHB premiums for 2027 are already set. The average enrollee share rises 10.9%. Your FEHB premium is the same whether or not you enroll in Part B, so adding Part B is always an added cost. The question is whether your plan gives enough back, through waived deductibles and copays or a Part B reimbursement, to make that cost worth it.
A retired couple on Blue Cross Basic, Self Plus One, pays $759.38 a month for FEHB in 2027. If both enroll in Part B at the 2026 standard rate, that adds $405.80 a month, or $4,869.60 a year. That yearly figure is what the plan's Medicare benefits need to offset.
Why might your Part B premium exceed the standard amount?
The Income-Related Monthly Adjustment Amount (IRMAA) is an added Medicare premium for higher-income beneficiaries. Social Security determines whether it applies using tax-return information supplied by the Internal Revenue Service. Because retirement can change income, do not assume the standard premium is your household’s price; verify the amount in your Social Security notice and review appeal rights after a qualifying life-changing event.
This page does not calculate IRMAA or give tax advice. Use the amount SSA assigns when comparing scenarios.
Which situations point toward each choice?
FEHB only may deserve closer review when
the added Part B premium or IRMAA is high relative to the cost sharing your FEHB plan would reduce; your providers already work well with FEHB; or a spouse is not yet Medicare-eligible and FEHB remains the household coverage anchor.
FEHB plus Part B may deserve closer review when
you expect frequent Medicare-covered care; your FEHB plan waives meaningful cost sharing when Medicare is primary; broader provider access matters; or the added premium buys valuable predictability.
Spouse, survivor, and CHAMPVA cases need separate inputs
Part B enrollment is individual, while FEHB tiers cover a household. Civilian Health and Medical Program of the Department of Veterans Affairs (CHAMPVA) eligibility can add separate Medicare requirements. Verify each person’s eligibility and do not apply one spouse’s answer automatically to the other.
CHAMPVA is an important exception
The Department of Veterans Affairs says that a person eligible for Medicare must generally have both Part A and Part B to get or keep CHAMPVA; a Medicare Advantage plan also meets that requirement. VA lists limited exceptions, including some people who are not eligible for premium-free Part A. If CHAMPVA applies to you or your spouse, verify the VA rule before declining Part B.
What should you verify before deciding?
- 1.Confirm you qualify to continue FEHB into retirement; this page does not decide the five-year enrollment prerequisite.
- 2.Read the Medicare coordination section of your current FEHB plan brochure, including any Part B reimbursement.
- 3.Check whether each important clinician and facility accepts Medicare and your FEHB plan.
- 4.Use your actual Part B and IRMAA amount, not only the standard premium.
- 5.Compare the decision separately for each spouse and test high-use as well as low-use years.
- 6.Review enrollment timing with Medicare. A Part B Special Enrollment Period is based on group coverage from your or your spouse’s current employment—not retiree FEHB. The usual window ends eight months after that employment or the coverage based on it ends, whichever occurs first.
Who is this for—and what can’t it determine?
This guide is for federal retirees and near-retirees who expect to keep FEHB and are deciding whether to add Part B. It is not a substitute for Medicare enrollment counseling, an FEHB brochure, medical advice, tax advice, or an OPM eligibility decision.
It cannot determine whether a specific claim will be paid, whether your providers will remain in-network, your future IRMAA tier, CHAMPVA eligibility, or the best election for your household. OPM controls FEHB rules, CMS administers Medicare, and the Social Security Administration (SSA) handles Part B enrollment and income-related premiums.
Compare FEHB plans using your household assumptions
After you identify the coordination features that matter, use FEHB Compare to review premiums, deductibles, out-of-pocket limits, plan type, and retirement-related notes. It does not determine Part B entitlement or replace the official plan brochure.
Compare FEHB plansModel the decision in your existing retirement scenario
If you already have a saved scenario, open it from your retirement plan dashboard and use Lifetime Income to compare long-term healthcare assumptions. Retirement Runway can help show how the added premium affects near-term cash flow. These modules model assumptions you provide; they do not decide Medicare eligibility or predict medical claims.