Don’t Make This Common Mistake with FEHB When You Hit Age 65

Missy E
November 14, 2025

Key Takeaways

Turning 65 doesn’t mean you should automatically drop your FEHB coverage—doing so could cost you far more in the long run.
Coordinating FEHB with Medicare Parts A and B can enhance your coverage and reduce your out-of-pocket healthcare expenses, but the right timing and enrollment strategy is critical.

What Happens to FEHB at Age 65?

When you turn 65, you become eligible for Medicare. For government retirees or those planning to retire soon, this milestone prompts an important question: Should you keep your Federal Employees Health Benefits (FEHB) coverage, or drop it in favor of Medicare?

The answer isn’t as simple as choosing one or the other. FEHB and Medicare are designed to work together. However, many public sector employees mistakenly believe they should cancel FEHB once Medicare begins. That’s a costly misunderstanding.

Let’s break down what you need to know.

Medicare Enrollment at 65: What You’re Automatically Enrolled In

If you’re already receiving Social Security benefits at age 65, you’re automatically enrolled in Medicare Part A and Part B. If you’re not, you must actively enroll during your Initial Enrollment Period:

Begins: 3 months before your 65th birthday
Ends: 3 months after your birthday month
Total Duration: 7 months

Most federal retirees enroll in Medicare Part A because it’s premium-free if you or your spouse worked for at least 10 years. But Medicare Part B comes with a monthly premium and requires a more strategic decision.

Why You Shouldn’t Drop FEHB When Medicare Starts

Many retirees think Medicare alone will meet all their healthcare needs and that dropping FEHB will save money. In reality, this move can backfire.

Here’s why keeping FEHB matters:

Broader Coverage: Medicare has gaps—such as prescription drugs, overseas care, and extended long-term care. FEHB can fill many of these.
Lower Out-of-Pocket Costs: When combined with Medicare, most FEHB plans waive deductibles and significantly reduce coinsurance.
More Flexibility: You keep access to a wide network of providers and healthcare services not always covered under Medicare alone.

In short, retaining FEHB enhances your Medicare benefits, offering both cost protection and peace of mind.

Medicare Part B: Do You Really Need It?

This is one of the most debated decisions for retirees. Medicare Part B covers outpatient services like doctor visits and lab work, but it isn’t free. The 2025 monthly premium is $185, and higher-income individuals pay more.

So should you enroll?

In most cases, yes—especially if you plan to keep FEHB.

Many FEHB plans coordinate with Part B: When both cover a service, Medicare pays first, and FEHB pays most or all of the rest.
Skipping Part B could cost more later: If you don’t enroll when first eligible, you face a permanent late enrollment penalty—10% for every 12-month period you delay.

You’re allowed to defer Part B if you’re still working and have group coverage. But once you retire, the clock starts ticking.

Coordinating Benefits: How FEHB and Medicare Work Together

When you have both FEHB and Medicare, your coordination of benefits depends on your employment status:

Still Working: FEHB pays first, Medicare is secondary.
Retired: Medicare pays first, FEHB is secondary.

This coordination reduces your share of medical bills. In fact, many retirees pay little to nothing in coinsurance or deductibles when both are active.

Here’s what each program typically covers:

Medicare Part A: Hospital care, skilled nursing, hospice, limited home health
Medicare Part B: Doctor visits, outpatient care, preventive services
FEHB: Prescription drugs, dental/vision in many plans, care overseas, additional services Medicare doesn’t cover

Together, they form a strong safety net.

Should You Switch FEHB Plans at 65?

Turning 65 is an ideal time to reassess your FEHB plan. Not all plans coordinate equally well with Medicare. Some offer incentives for retirees who enroll in Part B, such as:

Lower copays or waived deductibles
Partial reimbursement of your Part B premium
Enhanced drug coverage

During Open Season (November to December), compare plan brochures carefully. Look for sections labeled “Medicare and Your FEHB Plan”—they provide details on how the plan integrates with Medicare.

Can You Cancel and Re-Enroll in FEHB Later?

FEHB is one of the few retiree health plans that allow reinstatement after cancellation—but only under very limited circumstances. If you cancel your FEHB to rely solely on Medicare, you usually can’t re-enroll unless you:

Return to work for the federal government
Qualify for a special re-enrollment circumstance (extremely rare)

It’s safer to suspend your coverage (rather than cancel) if you’re moving to another plan like TRICARE or CHAMPVA. This way, you preserve the right to return to FEHB in the future.

What About Medicare Part D for Prescriptions?

Most FEHB plans already include prescription drug coverage, so enrolling in Medicare Part D is often unnecessary. However, if your FEHB plan is weak on drug coverage or you have high medication costs, compare it against Part D offerings.

Also, FEHB is considered creditable coverage for Part D. That means you won’t face a late enrollment penalty later if you choose not to sign up initially but decide to enroll in a Part D plan down the road.

Watch for Coordination Gaps

Even with both FEHB and Medicare, you need to stay alert to gaps and billing quirks:

Out-of-network providers may not bill Medicare, forcing you to file claims manually.
Foreign care is not covered by Medicare but may be included in some FEHB plans.
Prior authorization rules may differ between Medicare and your FEHB plan.

Read your plan brochure carefully to avoid surprises.

What If You’re Covering Family Members?

If your spouse or dependent is not yet 65, your FEHB plan can continue to cover them, even if you move to Medicare. Medicare is individual, but FEHB is family-friendly.

Be aware of the following:

Your spouse’s or child’s eligibility is tied to your enrollment.
If you drop FEHB, your dependents lose coverage too unless they have their own qualifying options.

Timing Matters: Plan Ahead Before Age 65

Don’t wait until your 65th birthday month to start thinking about this. Ideally, you should begin preparing at least 6 to 9 months in advance to:

Understand enrollment deadlines
Gather cost estimates
Reassess your FEHB plan
Consider financial impacts of Medicare premiums
Confirm dependent coverage requirements

Proactive planning makes the transition smoother and helps you avoid costly missteps.

Why Many Retirees Stick with FEHB and Add Medicare

Government retirees tend to retain FEHB and add Medicare rather than replacing one with the other. That’s because:

Medicare is designed to be a base layer of protection
FEHB fills in the gaps and enhances coverage
You’ve earned access to FEHB for life—why walk away from that?

In 2025, with rising healthcare costs and a growing senior population, this dual-coverage approach has become more valuable than ever.

What This Means for Your Retirement Strategy

Health coverage is one of the largest expenses in retirement, second only to housing. Mistiming your decisions at age 65—or misunderstanding how FEHB and Medicare work together—can derail your entire financial strategy.

Make sure your approach answers the following:

Are you keeping FEHB active through retirement?
Are you enrolling in Medicare Parts A and B on time?
Are you choosing the right FEHB plan for coordination?
Are your dependents still covered?

If you’re unsure, now is the time to speak with someone who understands both systems.

Get the Most from Your FEHB and Medicare Benefits

Turning 65 is a major retirement milestone—but it’s also a time when many retirees make preventable mistakes with their FEHB benefits. Don’t drop FEHB thinking Medicare will do it all. Instead, consider how both programs can support each other to give you more complete and cost-effective coverage.

Speak with a licensed professional listed on this website to walk through your specific situation. The right decision now can protect your health and financial stability for years to come.