Medicare Part B and Your Federal Health Plan: 7 Questions Federal Retirees Keep Asking

"Do I need Part B if I already have FEHB?"

If I had a dollar for every time someone has asked me that, I'd have retired already. And here's the frustrating part: the honest answer is "it depends," and most people only find out what it depends on after a deadline has passed.

The system was not designed to explain itself. So let's do it here, in plain English. If you're a federal or postal employee thinking about federal retirement benefits, this is one of the most expensive blind spots out there, and nobody in the break room is going to get it right.

1. Do I have to take Medicare Part B to keep my federal health coverage?

It depends on which program you're in. Federal civilian retirees are not legally required to enroll in Part B to keep FEHB coverage in retirement. It's a choice, and it deserves real analysis.

Postal retirees are different. Under PSHB, most Medicare-eligible postal retirees who retired on or after January 1, 2025 must enroll in Part B to keep PSHB coverage, with limited exceptions. The requirement applies to every Medicare-eligible person on the enrollment, including spouses. Exceptions include people who retired on or before January 1, 2025, certain people who were already 64 or older on that date, people eligible for VA or Indian Health Service care, people living abroad, and active employees.

Let me be direct: if you're a USPS employee, this rule can end your health coverage if you miss it. Know your category before you retire.

2. How much does Part B cost in 2026?

The standard 2026 Part B premium is $202.90 a month, or about $2,435 a year per person. The annual deductible is $283. If you're married and both of you are enrolled, double it. This is not a small number.

Higher earners pay more through IRMAA, the income-related surcharge. For 2026, it starts when your income from two years earlier exceeded $109,000 as a single filer or $218,000 married filing jointly. At the very top tier, the monthly premium can climb to $689.90.

One more thing: CMS typically announces next year's Part B figures in the fall. I'm not going to guess at 2027 numbers. Watch for the announcement, because it affects your budget either way.

3. What happens if I skip Part B and sign up later?

Medicare can add a permanent late-enrollment penalty: 10% added to your premium for every full 12-month period you were eligible but didn't enroll. You pay it for life.

But there's an important nuance. If you're still working past 65 and covered by FEHB as an active employee, that generally counts as current employer coverage, and you can delay Part B without a penalty. When that employment or coverage ends, you typically get an eight-month Special Enrollment Period. Missing that window is where people get hurt.

4. If I have both FEHB and Medicare, who pays first?

For retirees, Medicare generally pays first on most services, and your FEHB plan pays second, helping with deductibles and coinsurance. For people who use a lot of health care, that coordination can offset a meaningful part of the Part B cost. For people who rarely see a doctor, it may not. That's why this is a math problem and not a rule of thumb.

5. What do PSHB plans do for Part B costs?

Many PSHB plans offer reimbursement or reduced cost-sharing to Medicare-eligible members, with figures that vary by plan. Don't assume the reimbursement covers the whole Part B premium. Compare what your plan gives back with what Part B costs you, plus your own health usage.

Here's a composite example, with details changed. A postal retiree I'll call Tony assumed his plan would handle everything and didn't look into Part B until after he retired. By the time he realized the rule applied to him, he was racing a deadline and a penalty clock, and he had to scramble for a one-time fix. He got through it, but it was stressful and avoidable.

6. Does Part B timing affect my retirement date?

It can. If you retire before 65, your Initial Enrollment Period around your 65th birthday matters. If you retire after 65, your Special Enrollment Period matters. Either way, the date you retire sets a clock. A retirement date picked for pension reasons alone can create a Medicare headache that costs real money.

7. Is there a way to know what's right for my situation?

Yes: look at the numbers. The right answer depends on your program (FEHB or PSHB), your retirement date, your health usage, your income, and your plan's rules. A generic answer won't fit all of that. After decades of service, you shouldn't be guessing, and HR isn't built to model it for you.

The Bigger Picture

Confusion about your benefits is not a character flaw. The system was built to be complex. But Medicare timing is a perfect example of why the cost of getting it wrong is real: a lifetime penalty, a coverage gap, or an avoidable bill. The most expensive retirement mistake isn't a bad investment. It's waiting too long to understand what you actually have.

Frequently Asked Questions

Do federal retirees need Medicare Part B?

FEHB retirees are not required to enroll in Part B to keep FEHB coverage. Most Medicare-eligible postal retirees who retired on or after January 1, 2025 must enroll in Part B to keep PSHB coverage, with limited exceptions.

How much is the Medicare Part B premium in 2026?

The standard 2026 Part B premium is $202.90 per month, with a $283 annual deductible. Higher-income enrollees pay an additional IRMAA surcharge, which begins at $109,000 for single filers and $218,000 for joint filers.

What is the Part B late enrollment penalty?

The penalty adds 10% to your Part B premium for each full 12-month period you were eligible but did not enroll, and it generally lasts for as long as you have Part B.

Can I delay Part B while I'm still working for the federal government?

Generally yes. Coverage through your own current federal employment counts as employer coverage, so you can delay Part B without penalty and typically get an eight-month Special Enrollment Period after that employment or coverage ends.

Have You Run Your Numbers?

If you're not sure which category you fall into, or what your Part B decision costs you, that's your sign to check before a deadline decides for you. Get your Federal Retirement Blueprint at quiz.fedsecure.org and see where you stand. The weight lifts when you know.

This content is educational and not individualized financial, tax, or legal advice. Figures reflect CMS and OPM information at time of publication and may change. Examples are anonymized composites. Results vary.