If you are working past age 65 in New Mexico, your Medicare decisions are more complex than for those who retire at 65. New Mexico's federal and national-lab workforce—at Los Alamos National Laboratory, Sandia National Laboratories, Kirtland Air Force Base, and federal agencies—commonly works past 65, as do many private-sector New Mexicans who choose to keep working. This guide explains exactly how to make Medicare decisions when you're still employed.
The Six Key Decisions for Working Past 65
HSA Contributions & Medicare
Critical 6-month Part A lookback rule. Enrolling in Medicare ends HSA contributions immediately, and you may owe penalties on past contributions.
Coordinating Employer Coverage
The 20-employee rule, the COBRA myth, and how Medicare coordinates with workplace insurance.
Part B Special Enrollment Period
You have an 8-month SEP after leaving employer coverage. Avoid permanent Part B penalties with Form CMS-L564.
Part D & Creditable Coverage
What "creditable" means, the 2-month SEP after losing creditable coverage, and how to avoid Part D penalties.
Spouse on Your Employer Plan
If your spouse is on your employer health plan, your Medicare decisions affect them too.
Retirement Timing: 66, 67, 68, 70
How your retirement age affects Medicare enrollment, Social Security, and overall benefit strategy.
Why Working Past 65 is Common in New Mexico
New Mexico has a large federal and defense workforce. Major employers—Los Alamos and Sandia national laboratories (run by contractors for DOE/NNSA), Kirtland Air Force Base, White Sands Missile Range, and federal agencies across Albuquerque, Santa Fe, and Las Cruces—mean thousands of New Mexicans face decisions about Medicare while still actively employed.
The Federal Employee Health Benefits (FEHB) program creates unique considerations: while you are still working for the government you can delay Part B without penalty, but once you retire FEHB no longer protects you, so choosing whether to add Part B at 65 or at retirement requires careful analysis. See our full FEHB & Medicare guide.
The Three Most Common Mistakes
- Continuing HSA contributions after Medicare Part A starts. Part A enrollment retroactively starts up to 6 months before your application. Contributions during this lookback period create tax penalties.
- Assuming COBRA counts as employer coverage for Medicare. It does NOT. If you delay Part B because you have COBRA, you'll face permanent late penalties.
- Missing the 8-month Part B Special Enrollment Period. If you leave employer coverage, you have exactly 8 months to enroll in Part B without penalty. Past that, you pay 10% more for every 12-month delay—permanently.
Get Personalized Working-Past-65 Guidance
Working-past-65 Medicare decisions are complex and depend on your specific employer, plan size, HSA status, and retirement timing. A licensed Medicare agent in New Mexico can help you avoid costly mistakes.