Key Takeaways
- Coordinating FEHB and Medicare at 65 can give you more healthcare flexibility and may lower out-of-pocket costs.
- Understanding eligibility and benefit coordination helps you make informed decisions about whether to keep or change your health coverage.
As you near age 65, deciding how your Federal Employee Health Benefits (FEHB) and Medicare coverage fit together becomes an important part of your retirement journey. This guide explains how these programs interact so you can make confident healthcare choices as a federal retiree.
What Is FEHB?
Overview of Federal Employee Health Benefits
- Also Read: How the FERS Supplement Works: Steps for Eligibility and Application
- Also Read: Federal Retirement Planner Guide: Steps for Federal Employees Near Retirement
- Also Read: 9 Tips for Organizing Benefits Documents for Your Family and Managing Paperwork
The Federal Employee Health Benefits (FEHB) Program is a group health insurance program managed by the Office of Personnel Management (OPM). It offers a wide range of health plans, including fee-for-service, health maintenance organizations (HMOs), and high-deductible plans, tailored for federal employees, retirees, and their eligible family members. FEHB is well-known for its flexibility—you can choose your preferred plan and make changes during annual Open Season or after specific life events.
FEHB plans cover a broad range of healthcare needs, including doctor visits, hospitalization, prescription drugs, preventive services, and specialty care. As a federal retiree, you can continue your FEHB coverage into retirement as long as you meet certain eligibility rules.
Who Is Eligible for FEHB?
To be eligible for FEHB as a retiree, you must have:
- Retired on an immediate annuity (not a deferred pension)
- Been continuously enrolled in FEHB (or covered as a dependent) for the five years immediately before your retirement, or for your full period of federal employment if less than five years
Family members eligible for coverage generally include your spouse and dependent children under age 26. Some former spouses may be eligible under specific circumstances, as outlined by OPM.
What Is Medicare at 65?
Medicare Basics for Federal Retirees
Medicare is a federal health insurance program, primarily for individuals age 65 and older. For federal retirees, Medicare offers additional coverage that complements your FEHB plan. There are four parts to Medicare:
- Part A (Hospital Insurance): Helps cover inpatient hospital care, skilled nursing facility, and some home health services.
- Part B (Medical Insurance): Helps cover outpatient care, doctor visits, preventive services, and medical supplies.
- Part C (Medicare Advantage): Private plans that may combine Part A, Part B, and sometimes Part D.
- Part D (Prescription Drug Coverage): Standalone plans or included with Medicare Advantage for prescription drugs.
Eligibility and Enrollment Process
At age 65, you’re generally eligible for Medicare if you’re a U.S. citizen or permanent legal resident who has worked (or whose spouse has worked) long enough to qualify for Social Security. Most retirees enroll in Part A (often premium-free) and can also enroll in Part B (monthly premium required).
You have a seven-month Initial Enrollment Period for Medicare, beginning three months before the month you turn 65, including your birthday month, and ending three months after. Missing this window may lead to penalties unless you have qualifying coverage, such as from FEHB as an active federal employee.
How Do FEHB and Medicare Work Together?
Coordination of Benefits Explained
When you have both FEHB and Medicare, these programs coordinate your healthcare coverage. Coordination of benefits determines which plan pays first (primary) and which pays second (secondary). This process prevents duplicate payments and helps you maximize your benefits.
Having both can mean you pay less out of pocket, since Medicare and FEHB often cover services differently. For example, if Medicare is the primary payer, FEHB can cover cost-sharing amounts like copayments or deductibles.
Primary vs. Secondary Coverage
- If you are retired and age 65 or older: Medicare becomes your primary payer for most health services. Your FEHB plan provides secondary coverage, covering some costs Medicare doesn’t pay (such as copays or services not covered by Medicare but included in your FEHB plan).
- If you are still an actively working federal employee at age 65: FEHB usually remains primary, and Medicare is secondary. This also applies if you are covered as a dependent under an actively working spouse’s FEHB plan.
In most cases, combining FEHB and Medicare lets you see a wider range of providers and may reduce out-of-pocket costs.
Should You Keep FEHB When Enrolling?
Factors to Consider for Retirees
You can keep your FEHB coverage after enrolling in Medicare, but you don’t have to. Key considerations include:
- Coverage breadth: FEHB may cover services Medicare does not, like vision or overseas care.
- Cost: Enrolling in both programs means paying premiums for each. However, secondary coverage can lower your out-of-pocket medical costs.
- Flexibility: Some retirees value the security of dual coverage, while others drop FEHB for Medicare Advantage, or vice versa.
Impact on Healthcare Choices
Maintaining both FEHB and Medicare can provide peace of mind and more flexibility in your healthcare choices, especially if you prefer seeing specific providers or specialists. Dropping FEHB in retirement is rare and, in many cases, not reversible. Make sure you’re comfortable with your decision—review benefits and network access carefully.
What Changes at Age 65?
Automatic Medicare Enrollment
If you’re already receiving Social Security or a Civil Service Retirement System (CSRS) annuity by age 65, you may be automatically enrolled in Medicare Part A. You will need to actively enroll in Medicare Part B if you want it, unless you are covered by active employment-based health insurance.
Some federal retirees choose not to enroll in Part B (because of the premium) if they prefer to rely solely on FEHB coverage. However, missing your enrollment window can trigger penalties unless you qualify for a Special Enrollment Period.
Impact on Your Coverage Options
Turning 65 opens new healthcare choices. Medicare expands your provider network and coverage options. You can:
- Retain both FEHB and Medicare for broader coverage
- Coordinate which plan pays first depending on your work status
- Revisit your FEHB plan choice during Open Season, since some plans offer incentives for Medicare enrollees
Review your health needs and budget each year to make the most of your benefits at age 65 and beyond.
Common Misconceptions Explained
Misunderstandings About Dual Coverage
A common myth is that having both FEHB and Medicare is unnecessary or overly redundant. In fact, dual coverage enhances your protection and can significantly limit out-of-pocket costs by leveraging each program’s strengths.
The Truth About Dropping FEHB or Medicare
Some retirees assume they must choose one coverage over the other at 65, which isn’t true. You can keep both, drop one, or switch between certain types of Medicare plans during annual enrollment periods. Carefully consider any decision to drop FEHB—doing so may mean you can’t reenroll, and you might lose access to certain coverage not offered by Medicare alone.


