FEHB and Medicare: What to Know Before you Enroll

Learn how Medicare works with Federal Employee Health Benefits (FEHB) and find out if you should carry both types of coverage.

Around 8.2 million people receive Federal Employees Health Benefits (FEHB).1

Because federal workers can continue receiving these benefits after they retire, many older adults with FEHB may wonder if they should still enroll in Medicare. 

In this article, we look at how each type of Medicare insurance can work with FEHB. We explore some of the advantages and disadvantages of enrolling in Medicare for someone who is at least 65 years old and has FEHB coverage.

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FEHB and Original Medicare (Medicare Part A and Part B)

If you are eligible for premium-free Medicare Part A, there is no reason not to take advantage of it, even if you receive FEHB. Most people receive Medicare Part A without paying a monthly premium.

Part A will serve as your primary health insurance coverage for covered inpatient care and certain home care services, and FEHB will be the secondary payer. There is coordination of benefits between Medicare and FEHB, so the FEHB policy acts as supplemental coverage to Medicare Part A. 

If you wish to enroll in other types of Medicare coverage such as Medicare Advantage, Medicare Part D or Medigap, you will need to be enrolled in Part A.

Do retired federal workers need to sign up for Medicare Part B?

Medicare Part B is optional medical insurance coverage, and it comes with a standard premium of $174.70 per month in 2024. If you are entitled to FEHB and Medicare benefits, Medicare Part B would serve as the primary payer and FEHB would act as the secondary insurance payer.  

Your decision to enroll in Part B may depend on the benefits offered in your FEHB policy. Some of the things to consider include:

  • Part B may provide coverage for goods and services for which FEHB give zero or limited coverage.

  • Part B allows you to seek care any health care providers in the U.S. who accepts Medicare, while FEHB policies generally restrict you to a network of participating providers.

  • Because Medicare coordinates benefits with FEHB, you may be able to further reduce your out-of-pocket health care spending by pairing Part B with FEHB and taking advantage of the double coverage.

  • If you wish to join a Medicare Advantage (Medicare Part C) plan that offers dental or vision coverage (which are not always included in FEHB plans), you must be enrolled in Part B. 

Medicare Advantage plans and FEHB

Medicare Advantage plans provide all of the same basic benefits as Medicare Part A and Part B and may offer benefits not included in Original Medicare. 

These plans come with a monthly premium and you must maintain Part B enrollment to be eligible for a Medicare Advantage plan. 

If you have both a Medicare Advantage plan and FEHB, Medicare Advantage would serve as the primary payer and would then be supplemented by FEHB.

Some things to consider before enrolling in a Medicare Advantage plan:

  • Does your FEHB plan offer dental, vision, hearing or prescription drug benefits? How important are these benefits to you?

  • Does your FEHB plan cover long-term care services? Some Medicare Advantage plans offer coverage for care services that aren’t covered by Original Medicare and may not be covered by your FEHB.

  • Does your FEHB plan cover services like non-emergency health care transportation, memberships to gyms or wellness programs and home improvement projects designed for aging in place? 

Medicare prescription drug coverage when you have FEHB

Medicare Part D plans provide coverage exclusively for prescription drugs.

Many FEHB policies also include drug coverage, so your decision whether to enroll in a Part D plan may involve comparing your FEHB drug coverage against that of any Part D plans available in your area.

Medicare Supplement Insurance (Medigap)

Medicare Supplement Insurance, or Medigap, provides coverage for many of the out-of-pocket expenses that Original Medicare doesn’t cover, such as deductibles and copays. Medigap plans and Medicare Advantage plans are very different, and you cannot have both types of policies at the same time.

Generally, it would not be advised to have both a Medigap plan and an FEHB plan, because they would provide duplicate coverage for out-of-pocket Medicare costs.

Get help comparing Medicare plans where you live

You may contact your local State Health Insurance Assistance Program (SHIP) for free assistance with your Original Medicare benefits. 

If you’re considering enrolling in a Medicare Advantage plan or a Medicare prescription drug plan, you can compare plans online for free or over the phone with the help of a licensed insurance agent. Learn about the costs, coverage and benefits of plans that may be available in your area.

Compare Medicare Advantage plans in your area

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Or call 1-800-557-6059 (TTY: 711) to speak with a licensed insurance agent. We accept calls 24/7!


1 United States Office of Personnel Management (OPM). (Oct. 2019). Federal Benefits Open Season. Retrieved from www.opm.gov/healthcare-insurance/healthcare/reference-materials/2019-open-season.pdf.


About the author

Christian Worstell is a senior Medicare and health insurance writer with MedicareAdvantage.com. He is also a licensed health insurance agent. Christian is well-known in the insurance industry for the thousands of educational articles he’s written, helping Americans better understand their health insurance and Medicare coverage.

Christian’s work as a Medicare expert has appeared in several top-tier and trade news outlets including Forbes, MarketWatch, WebMD and Yahoo! Finance.

Christian has written hundreds of articles for MedicareAvantage.com that teach Medicare beneficiaries the best practices for navigating Medicare. His articles are read by thousands of older Americans each month. By better understanding their health care coverage, readers may hopefully learn how to limit their out-of-pocket Medicare spending and access quality medical care.

Christian’s passion for his role stems from his desire to make a difference in the senior community. He strongly believes that the more beneficiaries know about their Medicare coverage, the better their overall health and wellness is as a result.

A current resident of Raleigh, Christian is a graduate of Shippensburg University with a bachelor’s degree in journalism.

If you’re a member of the media looking to connect with Christian, please don’t hesitate to email our public relations team at Mike@tzhealthmedia.com.

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