What Is FEHB? Federal Employee Health Benefits Explained (Plus How Open Season Works)

If you're a federal or U.S. Postal Service employee, a federal retiree, or a family member covered under one of their plans, you're part of something bigger than you might realize: the Federal Employees Health Benefits (FEHB) Program is the largest employer-sponsored health insurance program in the United States, covering roughly 8.2 million people. And yet a huge number of people who actually have it couldn't tell you what the acronym stands for, let alone how it's structured differently from a typical employer health plan.

Here's what FEHB actually is, how it's different from both a normal workplace plan and the ACA Marketplace, and what you need to know about the one time of year your choices actually matter.

What FEHB actually is

FEHB is administered by the Office of Personnel Management (OPM) — not by any single insurance company. Instead of one employer-sponsored plan the way most private-sector jobs work, FEHB gives eligible enrollees a choice among dozens of competing health plans (a mix of fee-for-service/PPO-style plans and HMOs), with the government paying a substantial share of the premium no matter which plan you pick. <See more detail>

That structure — multiple competing private plans, subsidized by the government, chosen individually by the enrollee — is part of why FEHB is sometimes informally compared to a marketplace, even though it has nothing to do with the ACA Marketplace and isn't available to the general public.

Who's actually eligible

FEHB covers:

• Active federal civilian employees

• Federal retirees, generally provided they were continuously enrolled in FEHB for the five years immediately before retirement (or since their first opportunity to enroll, if they've worked fewer than five years)

• Eligible family members, including spouses and children up to age 26

• Certain Tribal employees and their families

U.S. Postal Service employees and retirees now enroll through a related but distinct program, the Postal Service Health Benefits (PSHB) Program, which launched in 2025 and runs on a very similar structure and the same enrollment calendar as FEHB.

Why FEHB is different from a typical employer health plan

The single biggest practical difference: FEHB has no medical underwriting. You cannot be denied FEHB coverage, and your premium cannot be increased, because of a pre-existing condition or your health history — a guarantee that goes well beyond what most private-sector group plans offer as a baseline, and one that matters enormously for enrollees managing chronic conditions.

You also get to choose your specific plan every single year if you want to, rather than being locked into whatever single plan your agency happens to offer, since FEHB enrollees typically have dozens of plan options depending on where they live.

FEHB Open Season: the few weeks that matter most

Outside of a small number of exceptions, you can only enroll in FEHB for the first time, switch plans, or change your enrollment type (Self Only, Self Plus One, or Self and Family) during Open Season — an annual window that generally runs from early-to-mid November through early-to-mid December, with any changes taking effect on January 1 of the following year.

For the most recent cycle, Open Season for the 2026 plan year ran November 10 through December 8, 2025. Based on that pattern, the next Open Season — covering the 2027 plan year — is expected to fall in a similar early-November-to-early-December window, though OPM confirms the exact dates each year and they can shift slightly, so it's worth checking OPM's official Open Season page as the date approaches rather than assuming last year's calendar repeats exactly.

Outside of Open Season, you generally can't change your FEHB enrollment at all unless you experience a Qualifying Life Event — marriage, divorce, the birth or adoption of a child, loss of other health coverage, or a handful of similar circumstances — which opens a separate, limited enrollment window tied to that specific event.

What else gets bundled into the same Open Season window

FEHB isn't the only benefit on the same calendar. During the same Open Season, eligible employees and retirees can also enroll in or change:

• FEDVIP (Federal Employees Dental and Vision Insurance Program) — separate, voluntary dental and vision coverage, fully paid by the enrollee rather than subsidized like FEHB premiums

• FSAFEDS (Federal Flexible Spending Account Program) — pre-tax accounts for health or dependent care expenses, available to active employees only, and notably FSAFEDS requires re-enrollment every single year — unlike FEHB and FEDVIP, which continue automatically if you don't make a change.
  

That last point trips people up more than almost anything else in the whole process: if you had an FSA last year and do nothing during Open Season, your FSA does not carry over — you have to actively re-enroll, every year, or you'll have no flexible spending account at all starting January 1.

Why premiums are worth paying attention to this year

FEHB premiums have risen substantially in recent years — up 8.7% in 2023, 7.7% in 2024, 13.5% in 2025 (the largest jump in more than a decade), and roughly 12.3% on average heading into 2026. None of that is a reason to skip Open Season; if anything, it's the opposite. Given how much plan costs shift year to year, reviewing your options — rather than letting your current plan auto-renew without checking it — is genuinely worth the half hour it takes, since a different plan in the same FEHB lineup may fit your needs for meaningfully less than what you're currently paying.

How to actually review and change your plan

Use OPM's FEHB Plan Comparison Tool, available on OPM's website, to compare premiums, deductibles, and provider networks for plans available where you live.

1. Pull your prior year's Explanation of Benefits (EOBs) so you have a realistic picture of what you actually used — prescriptions, specialist visits, dependent care — before assuming your current plan is still the best fit.

2. Make changes through your agency's enrollment system (commonly Employee Express or a similar agency-specific portal) during the official Open Season window.

3. Don't forget FSAFEDS if you use it — re-enroll during the same window, since it doesn't carry over automatically. [Click for FSAFEDS]

The bottom line

FEHB is one of the largest, most consequential benefits available to federal and postal employees, and one of the most misunderstood — not because it's complicated, but because there's a two-to-three-week window each fall where decisions matter, and the rest of the year, most people simply forget it exists. If you're eligible for it, marking Open Season on your calendar — and actually comparing plans rather than letting things auto-renew — is the single highest-leverage thing you can do with it.

This article is for general informational purposes only. FEHB, FEDVIP, and FSAFEDS rules, premiums, and Open Season dates are set annually by OPM and are subject to change. Confirm current details at opm.gov before making enrollment decisions.