Article content
Most Medicare guidance is written for people who never had employer coverage like the Federal Employees Health Benefits Program, or FEHB, in the first place. If you're a federal or postal retiree who kept FEHB into retirement, the general rules about Medicare enrollment windows and penalties still apply to you, but the coordination questions on top of them don't get answered in the standard Medicare mailings.
This walks through how FEHB and Medicare actually work together, the enrollment rule that changed for postal retirees specifically, and the questions worth asking before you decide whether to add Medicare Part B.
Choose your next move
Name your situation
Choose whichever describes you right now.
You retired from federal service and kept your FEHB plan.
Interactive toolWrite your specific FEHB and Medicare question before you callCoordination questions get better answers when they're narrow and specific to your plan.Show the toolHide the tool
Prepare short, specific Medicare or Social Security questions before your next call.
How FEHB and Medicare Actually Coordinate
You can generally keep FEHB into retirement if you're retiring on an immediate annuity and were enrolled in FEHB for the five years right before retirement, or since your first chance to enroll if you've worked less than five years. The government continues to pay a large share of the premium, typically around 70 to 75 percent up to a statutory cap, with the rest deducted from your annuity in after-tax dollars instead of the pre-tax deduction you had while working.
Once you add Medicare, the two typically coordinate rather than duplicate each other: depending on your specific FEHB plan's rules, it may reduce or waive your deductible and copays for services Medicare already covers, so your out-of-pocket cost for a given claim can drop even though you're now paying two premiums instead of one. Whether that trade is worth it depends on your prescription drug needs, whether you're subject to an income-related Part B surcharge, and whether your plan actually documents a Medicare coordination benefit or just says it works with Medicare.
ChecklistCheck these before you decideYour plan's own benefit summary has these answers.Show the checklistHide the checklist
0 of 3 done.
Postal Retirees: The Part B Rule That Changed
The Postal Service Reform Act of 2022 created a separate Postal Service Health Benefits Program, or PSHB, which began covering postal employees and retirees in 2025. Most Medicare-eligible postal retirees are now required to enroll in Medicare Part B to keep their PSHB coverage, a requirement that doesn't exist for federal retirees who stayed on standard FEHB plans.
There are exceptions, including for some retirees who were already 64 or older, or already retired, before the rule took effect, so this isn't automatic for every postal retiree. If you're not certain which category you fall into, that's exactly the kind of narrow, specific question to bring to the tool above before you call.
ChecklistConfirm your postal enrollment statusGet this confirmed before an enrollment window closes on you.Show the checklistHide the checklist
0 of 3 done.
If Tricare instead of FEHB is your other coverage, Tricare and Medicare: Enrolling at 65 covers that specific coordination instead.
Name Your Plan and Bring the Real Question
Once you know which situation applies to you, the fastest path to a usable answer is naming your actual FEHB or PSHB plan instead of asking about FEHB in general. Plan-specific rules on deductibles, drug coverage, and Medicare coordination vary enough that a generic answer can send you in the wrong direction.
Personalize this article
Name your plan
Naming it now makes every later call and comparison more concrete.
If a recent premium change already caught you off guard, Your 2026 Medicare Out-of-Pocket Numbers breaks down what's driving costs up this year.
Save your plan
Save your situation, your plan name, and your coordination checks in one place.
Common questions
Can I keep my FEHB plan after I retire?
Generally yes, if you retire on an immediate annuity and were enrolled in FEHB for the five years immediately before retirement, or since your first opportunity to enroll if you've worked less than five years. The government continues paying a large share of the premium, typically around 70 to 75 percent up to a statutory cap, with the rest deducted from your annuity.
Do I still need Medicare Part B if I have FEHB?
It depends on your situation. Standard FEHB retirees aren't required to enroll in Part B, but many add it because their plan reduces or waives cost-sharing for services Medicare covers. Most Medicare-eligible postal retirees under the newer PSHB program are required to enroll in Part B to keep their coverage, with some exceptions for retirees who were already 64 or older, or already retired, before the rule took effect.
What changed for postal retirees with the PSHB program?
The Postal Service Reform Act of 2022 created a separate Postal Service Health Benefits Program that began covering postal employees and retirees in 2025. Most Medicare-eligible postal retirees are now required to enroll in Medicare Part B to keep their PSHB coverage, a requirement standard FEHB retirees don't have.
How do FEHB and Medicare coordinate on a claim?
It varies by plan, so check your specific FEHB or PSHB plan's benefit summary rather than assuming. Many plans reduce or waive deductibles and copays for services Medicare already covers, which can lower your out-of-pocket cost for a given claim even though you're paying two premiums instead of one.
