Key Takeaways
- Medicare Part A and FEHB coordinate based on federal rules, with primary and secondary payer roles shifting based on employment status.
- Recent updates, including the WEP repeal, affect coordination and benefits—understanding these changes is essential for long-term planning.
Most federal retirees have access to both FEHB and Medicare Part A, but coordinating benefits isn’t always straightforward. Understanding official rules and your available options can help clarify this critical decision as you plan your health coverage for retirement.
What Is Medicare Part A?
Hospital inpatient coverage basics
Medicare Part A primarily covers inpatient hospital care, skilled nursing facility services, some home health care services, and limited hospice care. As an entitlement program under the Social Security Act, it is often called hospital insurance. When you are admitted as an inpatient to a qualified hospital or facility, Medicare Part A helps cover your room, meals, nursing services, and certain drugs and medical supplies during your stay.
Eligibility requirements in 2026
To be eligible for Medicare Part A in 2026, you generally must be age 65 or older and either eligible for Social Security or Railroad Retirement benefits. Most individuals who worked in the United States and paid Medicare (FICA) taxes for at least 10 years qualify for premium-free Part A. Some under age 65 may qualify because of certain disabilities or medical conditions, but age-based eligibility is most common among federal retirees.
How Does FEHB Work?
FEHB overview for retirees
The Federal Employees Health Benefits (FEHB) Program offers group health insurance to federal employees, retirees, and eligible family members. For retirees, FEHB typically continues into retirement if you were continuously enrolled (or covered as a family member) under FEHB for the five years immediately before you retire, or during all your federal employment, if less than five years.
Enrollment and eligibility
Retired federal employees are generally eligible to maintain FEHB coverage throughout retirement, provided they meet these continuity requirements. Annual enrollment seasons allow retirees to make plan changes. Unlike Medicare, FEHB allows you to cover spouses, some former spouses, and children up to age 26 in most cases.
What Happens When You Have Both?
Coordination of benefits explained
When you’re enrolled in both Medicare Part A and FEHB, the two programs coordinate benefits according to federal rules. Coordination means that one plan may act as the “primary” payer—paying first on your claims—while the other serves as “secondary” and may cover costs not paid by the primary plan.
Which plan pays first?
Whether FEHB or Medicare Part A pays first depends on your employment status. If you are retired, Medicare Part A nearly always pays first (primary) for covered inpatient hospital services, and FEHB becomes secondary. However, if you are still actively employed by the federal government at age 65 or older, FEHB remains primary, and Medicare is secondary.
Required Rules for Federal Retirees
Mandatory enrollment scenarios
For most federal retirees, you don’t have to enroll in Medicare Part A. However, you are generally eligible for premium-free Part A and many choose to enroll at 65 to take advantage of secondary coverage, potentially reducing out-of-pocket spending for hospital stays. In rare cases—such as if you didn’t pay into Social Security or lack qualifying work history—you may not be eligible without paying a premium.
Exceptions and special cases
Some individuals who retired before meeting the five-year continuous FEHB coverage rule may lose FEHB eligibility, even if they’re enrolled in Medicare. Exceptions also apply to disabled retirees, survivor annuitants, or those with complex family status; federal rules govern these cases, so review the specific criteria.
What Are Your Coverage Options?
FEHB only versus combining with Part A
You can keep FEHB alone in retirement, enroll only in Medicare Part A, or combine FEHB with Medicare Part A. Most federal retirees qualify for and enroll in both, as this combination can reduce your exposure to inpatient hospital costs. You can also change your FEHB plan or switch between self-only, self-plus-one, or family coverage annually.
How to keep or change coverage
You may continue FEHB as long as you meet eligibility criteria, regardless of Medicare enrollment. Each year during Open Season, you can review your options and change FEHB plans. Medicare enrollment does not cancel your FEHB eligibility, nor does it restrict you from making FEHB changes in the future.
Can You Delay Medicare Part A?
Deferral rules and deadlines
If you are eligible for premium-free Medicare Part A, you can delay enrollment—but most retirees choose to enroll at age 65. There is no late enrollment penalty for premium-free Part A. However, if you lack sufficient work history and would be subject to Part A premiums, deferral or forgoing Part A requires careful consideration of how that may affect your access to hospital coverage.
Impacts on FEHB eligibility
Delaying or declining Medicare Part A does not impact your FEHB eligibility as long as you continue to meet OPM coverage rules. However, without Medicare, FEHB becomes the only payer for covered hospital expenses, which may affect your overall out-of-pocket exposure for certain services.
Cost Considerations in 2026
Premiums for Medicare and FEHB
In 2026, most federal retirees can get premium-free Medicare Part A. You will continue to pay premiums for your chosen FEHB plan as a retiree. If you must pay for Part A because of limited work history, review official government resources for current premium amounts.
Out-of-pocket expenses
When enrolled in both programs, Medicare Part A pays eligible inpatient costs first. FEHB may cover certain copayments, coinsurance, or services Medicare doesn’t fully reimburse. Out-of-pocket costs depend on your specific FEHB plan and service utilization; always review your FEHB plan brochure to understand what expenses FEHB pays as secondary.
Common Questions About Coordination
Will FEHB become secondary?
Yes—when you retire and enroll in Medicare Part A, FEHB typically becomes the secondary payer for hospital services. This means FEHB usually picks up costs not covered by Medicare, in accordance with federal coordination rules.
Are prescription drugs affected?
Medicare Part A does not generally cover outpatient prescription drugs. With FEHB, your plan continues to provide outpatient drug coverage as it did before you enrolled in Medicare. Compare the prescription coverage each FEHB plan offers, as benefits differ.
How Do Recent Rule Changes Affect You?
Updates since previous years
Rules and rates for both Medicare and FEHB are periodically updated by federal agencies. Effective in 2025, the Windfall Elimination Provision (WEP) was repealed, so it no longer impacts federal retirees’ Social Security benefits. Plan designs and costs may also shift annually.
Impact of the WEP repeal on benefits
With the WEP repeal, federal retirees with Social Security benefit eligibility receive standard Social Security calculations, without the previous WEP reduction. This change may affect your overall retirement income but does not directly alter Medicare or FEHB rules.
What Should Retirees Consider?
Long-term planning factors
Consider your health needs, anticipated use of hospital and outpatient services, and your projected retirement budget. Review both FEHB and Medicare publications annually, stay informed about rule changes, and compare available FEHB plans to find the best fit.
Resources for further information
Refer to official resources such as OPM.gov and Medicare.gov for current and authoritative information. Both provide plan comparison tools, eligibility calculators, and fact sheets to help you stay updated on your benefits and changes impacting federal retirees.
