Medicare at 65 and how it works with FEHB

At 65 you become eligible for Medicare. Your FEHB coverage does not 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 is the real choice.

FEHB and Medicare are built to work together. Each covers different things, and for retirees Medicare generally pays first while FEHB fills in behind it. 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. We explain the tradeoffs; the right mix depends on your situation.

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 is why nearly everyone enrolls in Part A at 65.

Part B has a premium. It covers physician and outpatient services, and you pay a monthly premium for it. Higher earners pay a surcharge called IRMAA, 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 retirees with FEHB generally do not need a separate Part D plan. Your plan brochure confirms this.

This is the central question, and there is no single answer. 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.

But Part B is an added cost. You pay its monthly premium for life, 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 is a cost-versus-coverage tradeoff. The table lays out the two paths. The right one depends 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 is left. 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 does not, so the combination is more complete than either alone.

You do not file anything. Once both are active, the claims coordinate automatically between Medicare and your FEHB plan. You generally just show both cards.

Drug coverage stays with FEHB. Because your FEHB plan’s drug coverage is usually creditable, your prescriptions run through FEHB, not a separate Part D plan. The pieces fit together without you managing them.

Timing matters, and it differs for workers and retirees. If you are still working past 65 with FEHB, you can usually delay Part B with no penalty. If you are 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. You can take Part B penalty-free when you retire, within the window after your employment ends.

Retirees do not get that window. FEHB as an annuitant is not current-employment coverage, so it does not 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 percent more for each 12 months you could have enrolled but did not, and that surcharge lasts as long as you have Part B. That is 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 are still working all shape the choice.

Worth checking before you decide:

There is no universally right answer; it depends on 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 do not.
• 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.