New Mexico is home to a significant federal workforce, including federal employees and retirees at the Department of Energy and NNSA offices that oversee Los Alamos and Sandia national laboratories, Kirtland Air Force Base, White Sands Missile Range, numerous federal agencies in Santa Fe and Albuquerque, and state government employees with similar benefit structures. Understanding how the Federal Employees Health Benefits (FEHB) program interacts with Medicare is critical for New Mexicans navigating federal retirement.
How FEHB and Medicare Work Together
When a federal retiree with FEHB enrolls in Medicare, the two programs coordinate benefits:
- Medicare becomes the primary payer for covered services
- FEHB becomes the secondary payer and may cover remaining costs that Medicare does not pay
- FEHB may pay some or all of what Medicare doesn't, depending on your plan
Should You Enroll in Medicare Part B?
This is a common question for federal retirees. Here is the analysis:
| Scenario | Part A | Part B | Recommendation |
|---|---|---|---|
| Premium-free Part A eligible | Enroll (premium-free) | Optional | Part A is premium-free for most people; enroll unless you or your employer still contribute to an HSA. Part B adds cost but can lower OOP. |
| Want lowest OOP costs | Yes | Yes | Medicare + FEHB together can lower what you pay at point of service. |
| Want lowest monthly premiums | Yes | No | Skip Part B and rely on FEHB as primary. FEHB still covers well, but adding Part B later means a permanent late penalty. |
| High-income (IRMAA applies) | Yes | Evaluate | IRMAA surcharges may make Part B less cost-effective. Run the numbers. |
Know the Part B penalty before you skip it: FEHB coverage as a retiree does not give you a Medicare Special Enrollment Period. If you don't take Part B when you are first eligible, you can sign up later only during the General Enrollment Period (January 1 to March 31), and your Part B premium goes up 10% for each full 12 months you could have had Part B, for as long as you have it. Only coverage from current federal employment (yours or your spouse's) lets you delay Part B without a penalty. FEHB does count as creditable drug coverage, so you won't owe a Part D penalty if you keep FEHB and join a Part D plan later.
FEHB vs. Medicare Advantage
Some retirees consider dropping FEHB in favor of a Medicare Advantage plan. Be cautious:
- Risk: If you voluntarily cancel FEHB, you generally cannot re-enroll later. Annuitants can instead suspend FEHB to join a Medicare Advantage plan and re-enroll later
- FEHB advantages: Many FEHB plans have national networks (some require referrals; check your plan brochure), and you have the ability to change plans annually during FEHB Open Season
- MA advantages: Premiums vary by plan, and some plans offer extra benefits such as dental, vision and hearing
- Common middle path: Some retirees keep FEHB and add premium-free Part A, which gives them dual coverage without paying Part B premiums; the trade-off is the Part B late penalty if they want Part B later, for example to join a Medicare Advantage plan
FEHB Open Season & Medicare AEP
Federal retirees have two annual review periods:
- FEHB Open Season: From the Monday of the second full workweek in November through the Monday of the second full workweek in December
- Medicare AEP: October 15 through December 7
These overlap, allowing you to evaluate both FEHB and Medicare options simultaneously each fall.
NM Federal Employers & FEHB
- Los Alamos National Laboratory (LANL): Run for DOE/NNSA by a contractor (Triad National Security), so most LANL employees are contractor employees with the lab's own retiree medical plans, not FEHB. Federal NNSA staff at the lab are in FEHB.
- Sandia National Laboratories: Run for NNSA by a contractor (National Technology & Engineering Solutions of Sandia), so Sandia employees have the contractor's benefits, not FEHB. Check how your lab retiree plan works with Medicare.
- Federal agencies (Santa Fe & Albuquerque): BLM, Forest Service, Indian Affairs, DOE, VA, and numerous other agencies
- Military installations: Kirtland AFB, Holloman AFB, Cannon AFB, White Sands (see our military/TRICARE page)
Frequently Asked Questions
Do I have to enroll in Medicare if I have FEHB?
You are not required to enroll in Medicare Part B to keep FEHB. (Postal annuitants in the Postal Service Health Benefits (PSHB) Program who become eligible for Medicare on or after January 1, 2025 generally must enroll in Part B to keep PSHB coverage, with limited exceptions.) Enrolling in Part A (which is premium-free for most people) is usually recommended, unless you or your employer still contribute to an HSA, because it can reduce your out-of-pocket costs. Part B is optional, but if you are retired and skip it when first eligible, you can enroll later only from January 1 to March 31 and will pay a late enrollment penalty for as long as you have Part B.
Does FEHB change when I turn 65?
Your FEHB plan continues to work the same way after you turn 65. If you are retired and also enroll in Medicare, Medicare becomes the primary payer and FEHB becomes secondary. FEHB may pay some or all of what Medicare does not, depending on your plan. While you are still working for the federal government, FEHB stays primary.
Should I drop FEHB for Medicare Advantage?
This requires careful analysis. FEHB plans can provide comprehensive coverage, and you can keep FEHB alongside Original Medicare. If you cancel FEHB, you may not be able to re-enroll; annuitants can instead suspend FEHB to join a Medicare Advantage plan and re-enroll later. Check with your agency benefits office or OPM Retirement Services before making this decision.
Federal employees working past 65: See our complete Working Past 65 cluster for detailed guidance on HSA contributions, the 8-month Part B SEP, Part D creditable coverage, and retirement timing.
Related Working Past 65 Resources
Federal retirees often have complex Medicare decisions. See our complete Working Past 65 cluster:
- Working Past 65 in New Mexico - Overview
- HSAs and the Medicare 6-Month Lookback
- Employer Coverage Coordination Rules
- Part B Special Enrollment Period
- Part D Creditable Coverage Rules
- Timing Your Retirement at 66, 67, 68, or 70
Get Personalized FEHB + Medicare Guidance
A licensed insurance agent familiar with federal employee benefits can help you analyze whether adding Part B makes financial sense for your specific FEHB plan and healthcare needs.