Medicare at 65 and how it works with FEHB

When you become eligible for Medicare at 65, your FEHB coverage doesn’t end or change automatically; it continues whether or not you take Medicare. So 65 is a decision point, not a cutoff.

The decision is mostly about Part B. Part A is hospital coverage and is premium-free for almost everyone, so most people simply take it. Part B is medical coverage with a monthly premium, and that’s the real choice.

FEHB and Medicare are built to work together, since each covers different things. For retirees, Medicare generally pays first while FEHB fills in behind it, and the question is how much Medicare to add.

This lesson covers the parts of Medicare, whether to take Part B with FEHB, how they coordinate, and the enrollment timing that avoids penalties. It lays out what each piece costs and adds, and leaves the mix to you.

Medicare has four parts, but three matter most here. Part A covers hospital stays, Part B covers doctors and outpatient care, and Part D covers prescription drugs. Part C (Medicare Advantage) is a private alternative that bundles them.

Part A is usually free. If you or your spouse paid Medicare taxes for about 10 years, which most federal employees do, Part A costs no premium. That’s why nearly everyone enrolls in Part A at 65.

Part B has a premium. It covers physician and outpatient services, and you pay for it monthly. Higher earners pay a surcharge called IRMAA (short for income-related monthly adjustment amount), based on income from two years earlier.

Part D is usually covered already. Most FEHB plans include prescription drug coverage at least as good as Medicare Part D, so you won’t owe a late-enrollment penalty for deferring it. Some plans now go further and enroll Medicare-eligible members into a Part D plan of their own, described below.

This is the central question, and it has two workable answers. Keeping FEHB alone gives you solid coverage without the Part B premium. Adding Part B layers in Medicare as your primary payer, which can lower your out-of-pocket costs but adds a premium.

Part B can reduce what you pay at the doctor: when you have both, Medicare pays first, and FEHB pays second. Many FEHB plans then waive their deductibles and copays for services Medicare covers, and some reimburse part of your Part B premium.

On the other hand, Part B is an added cost. You pay its monthly premium for as long as you keep Part B, more if IRMAA applies. For someone who rarely uses outpatient care, or whose FEHB plan already has low cost-sharing, the extra premium may not pay off.

It’s a cost-versus-coverage trade-off, and the table lays out the two paths. Which one fits turns on your health needs, your FEHB plan’s features, and your income.

For retirees, Medicare pays first, and FEHB pays second. Medicare processes a claim, then your FEHB plan covers much of what’s left, so together they can cover most of a bill.

FEHB fills Medicare’s gaps. Medicare has deductibles and coinsurance with no overall cap on what you pay. FEHB adds an out-of-pocket maximum and covers services Medicare doesn’t, so the combination is more complete than either alone.

You don’t file anything. Once both are active, the claims coordinate automatically between Medicare and your FEHB plan, and you generally just show both cards.

Drug coverage stays with your FEHB plan. Its drug benefit is usually creditable, so you don’t need a Part D plan of your own; some plans (and every PSHB plan) deliver it through a Part D EGWP they enroll you in, and the pieces fit together without you managing them.

Timing matters, and it differs for workers and retirees. If you’re still working past 65 with FEHB, you can usually delay Part B with no penalty. If you’re already retired, the decision generally happens at 65, because waiting can trigger a permanent penalty.

Working past 65 buys you time. FEHB from current employment is coverage that lets you qualify for a special enrollment period (a sign-up window outside the normal enrollment periods). You can take Part B penalty-free when you retire, within the window after your employment ends.

Retirees don’t get that window. FEHB as an annuitant isn’t current-employment coverage, so it doesn’t create a special enrollment period. If you skip Part B at 65 and want it later, you generally face the late-enrollment penalty.

The penalty is permanent. Part B costs 10% more for each full 12-month period you could have enrolled but did not, and that surcharge lasts as long as you have Part B. That’s why the Part B choice at 65 carries weight for retirees.

Approach Part B as a cost-versus-coverage decision, made at the right time. Weigh the premium, including any IRMAA, against the lower out-of-pocket costs and the features your FEHB plan offers Medicare enrollees. Then act within your enrollment window.

A few factors carry the most weight. Your health and expected care, whether your FEHB plan waives cost-sharing or reimburses Part B, your income for IRMAA, and whether you’re still working all shape the choice.

Worth checking before you decide:

How those factors balance out differs with your plan, your health, and your income. Read your FEHB plan’s brochure for how it treats Medicare, and see how health costs fit your broader plan with your free readiness score. The decision stays yours.

• Your FEHB plan’s Medicare features. Some waive deductibles and copays or reimburse part of the Part B premium; others don’t.
• Your income. A high income can raise the Part B premium through IRMAA.
• Your timing. Working past 65 lets you delay Part B; retirees generally decide at 65 to avoid the penalty.