Key Takeaways
- Federal retirees can coordinate FEHB and Medicare for broader coverage, but rules differ based on enrollment choices.
- 2026 introduces new timelines and updates that may impact coordination, so staying informed is crucial.
Most eligible federal retirees opt to combine FEHB and Medicare at age 65, yet coordination rules can be complex. This guide explains how the systems work together in 2026 and what’s new this year. If you’re approaching retirement or updating your coverage, understanding the interplay between FEHB and Medicare is essential for informed decision-making.
What Is FEHB for Retirees?
Basic features of FEHB in retirement
As a retired federal employee, you likely have access to the Federal Employees Health Benefits (FEHB) program. FEHB continues offering group health insurance much like it did while you were actively employed—providing hospitalization, physician services, preventive care, and prescription drug options under various plan types. For retirees, FEHB plans offer:
- Continued coverage with the ability to modify or change plans annually during Open Season.
- The same government contribution toward premium cost as during employment, with deductions from your monthly retirement annuity.
- No requirement to enroll in Medicare to keep FEHB, but additional options open up at age 65.
Eligibility requirements for former federal employees
To remain eligible for FEHB as a retiree, you generally must:
- Have retired on an immediate annuity (regular, early, or disability).
- Be covered under FEHB for the 5 years of service immediately before retirement, or since your first opportunity to enroll if less than 5 years.
- Not have forfeited eligibility through separation, deferred annuity, or other disqualifying events.
Once retired, you’re eligible to carry FEHB into retirement for life, subject to these conditions.
How Does Medicare Work at Age 65?
Parts of Medicare explained
Medicare, the federal health insurance program, helps cover much of the healthcare needs of adults aged 65 and older as well as certain persons with qualifying disabilities or illnesses. At its core, Medicare includes:
- Part A (Hospital Insurance): Covers inpatient care, skilled nursing facilities, hospice, and some home health care.
- Part B (Medical Insurance): Assists with doctor services, outpatient care, preventive services, and some home health care. It usually requires a monthly premium.
- Part D (Prescription Drug Coverage): Offers coverage for prescription medications; optional and typically added through private drug plans approved by Medicare.
Enrollment options for federal retirees
Retired federal employees become eligible for Medicare at age 65. You can:
- Enroll automatically in Part A (if entitled to Social Security or Railroad Retirement benefits).
- Elect whether to enroll in Part B; most federal retirees choose to do so, but it is optional.
- Decide whether to add Part D based on prescription drug needs and FEHB coverage.
It’s important to compare benefits and costs under FEHB with Medicare before making any permanent changes.
How Do FEHB and Medicare Coordinate?
Who pays first: Medicare or FEHB?
For federal retirees who enroll in both Medicare and FEHB, the systems follow “coordination of benefits” rules to determine payment order:
- If you’re retired and enrolled in Medicare: Medicare generally pays first, and FEHB pays second (as secondary insurance), covering some costs Medicare does not.
- If you have family members still working under your FEHB plan: If the family member is actively employed, FEHB may pay first.
This coordination reduces out-of-pocket expenses for many retirees.
Rules for dual enrollment
If you keep both FEHB and Medicare:
- FEHB remains available with no penalty for continuing, even after enrolling in Medicare.
- Some FEHB plans offer reduced premiums or enhanced benefits when combined with Medicare A and B, as the FEHB plan typically covers what Medicare does not, including prescription drugs (if you do not select Part D).
- You may see reduced claim denials or copays due to FEHB filling gaps in Medicare’s coverage.
Situations affecting coordination
A few situations can change who pays first:
- If you are under age 65 and qualify for Medicare due to disability, coordination may differ.
- If you or a family member covered by FEHB is still working for the federal government, FEHB may pay first for the actively employed individual.
- Certain medical services and facilities may have different coverage requirements depending on where and how care is received.
What Changes in Coordination for 2026?
Recent federal updates affecting retirees
In 2026, coordination between FEHB and Medicare includes updates following recent federal legislation and guidance. Key changes include:
- Fine-tuned eligibility checks: Automated cross-agency systems aim to minimize overlap and ensure proper coordination for newly retired employees.
- Better plan alignment: More FEHB plans are offering policies that mesh more closely with Medicare, improving communication between the two programs.
No changes have removed your ability to participate in both, and the core payment relationships remain the same.
New enrollment timelines or rules
For 2026, retirees should note:
- Streamlined Medicare enrollment windows: Most eligible retirees are now notified automatically when approaching age 65. Enrollment penalties still apply for late enrollment in Part B unless you have continuous FEHB coverage.
- Clearer Open Season information: FEHB Open Season materials now more clearly indicate how choices align with Medicare enrollment, including the impact of new or changed plan offerings.
Retirees are encouraged to stay current with materials from OPM and Social Security to avoid missing crucial deadlines or losing benefits.
Should You Keep FEHB After Enrolling in Medicare?
General options available
Once you are enrolled in Medicare, you can:
- Continue both FEHB and Medicare for dual coverage.
- Suspend (but not cancel) FEHB if you prefer to have only Medicare—this may be considered if other supplemental coverage options arise or costs become a concern.
- Remain on FEHB alone, particularly if you are not subject to late enrollment penalties for deferring Medicare.
Considerations for keeping or suspending coverage
Key factors to weigh include:
- Out-of-pocket costs: Dual coverage may reduce some costs, but means continuing FEHB premiums in addition to any Medicare premiums.
- Coverage gaps: Medicare alone may not cover all services included in FEHB, such as wider access to prescription drugs or family coverage.
- Re-enrollment implications: Suspending (not canceling) FEHB leaves the door open to return under certain qualifying events; canceling generally means you cannot rejoin FEHB later.
Assess your ongoing needs, anticipated health expenses, and comfort with your expected coverage levels.
What If You Have Only One—FEHB or Medicare?
Coverage if you keep FEHB without Medicare
You may retain FEHB alone and decline Medicare Parts A and B. FEHB will be your sole provider and will pay claims as primary. However, you may miss out on the opportunity for secondary payment—which can leave you with higher out-of-pocket costs for services Medicare would have covered. You may also face late enrollment penalties for Part B if you decide to join Medicare later in life.
Implications of having Medicare only
If you suspend FEHB to rely on Medicare only, you’ll have Medicare Parts A and B as your main coverage. This means:
- No FEHB prescription benefits unless you add Part D (since FEHB drug coverage does not continue if suspended or canceled).
- More limited family coverage, as Medicare only provides coverage for individuals and not dependents.
Carefully review your health needs and consider potential gaps in services or access.
