Turning 65 while still working — or having a spouse who’s still working — raises a common question: do I need to sign up for Medicare right now, or can it wait? The answer depends largely on the size of the employer and how coordination of benefits works. Here’s a general overview.
Employer Size Matters
If you work for a company with 20 or more employees, your employer’s group health plan is typically considered the primary payer, and Medicare would pay second. In this situation, many people choose to delay enrolling in Part B (and sometimes Part A, depending on their situation) without facing a late enrollment penalty, since active employer coverage generally counts as creditable.
If your employer has fewer than 20 employees, Medicare typically becomes the primary payer once you’re eligible, and the employer plan pays second. In that case, you usually need to enroll in Medicare Part B at 65 to avoid a gap in adequate primary coverage, even if you keep your employer plan too.
Coordinating Part A
Part A (hospital insurance) is usually premium-free for most people who’ve worked and paid Medicare taxes long enough, so many people enroll in Part A at 65 regardless of employment status. One thing to watch: if you or your employer contribute to a Health Savings Account (HSA), enrolling in any part of Medicare — including premium-free Part A — makes you ineligible to continue HSA contributions. Some people choose to delay all Medicare enrollment specifically to keep contributing to an HSA a bit longer.
What Happens When Employment Ends
When you retire or lose employer coverage, a Special Enrollment Period generally gives you an eight-month window to enroll in Part B without a late penalty, starting the month after employment or coverage ends (whichever comes first). It’s important to enroll during this window — missing it can mean waiting for the next General Enrollment Period and potentially facing a permanent premium penalty on top of the standard $202.90 monthly Part B premium in 2026.
COBRA and Retiree Coverage Are Different
A common point of confusion: COBRA continuation coverage and retiree health plans are generally not considered active employer coverage for Medicare purposes, even though they may look similar to your old plan. If you’re relying on COBRA or a retiree plan, you typically still need to enroll in Medicare during your normal enrollment window to avoid penalties — don’t assume COBRA buys you extra time.
Getting the Coordination Right
Because these rules hinge on employer size, plan type, and your specific enrollment history, it’s easy to make an assumption that costs you a penalty down the road. If you’re navigating this transition, our turning 65 page offers a general starting point, and we’re always happy to look at your specific employer coverage and timeline. Schedule a free consultation and we’ll help you map out the right dates.
Informational purposes only. This article is for general education and reflects 2026 Medicare figures; it is not insurance, legal, tax, or financial advice. Coordination of benefits rules can vary by plan and employer — confirm your specific situation with your benefits administrator and Medicare. Kayla Price is a licensed insurance agent (NPN 18530055) with Price Services Group, an independent agency not connected with or endorsed by the U.S. government or the federal Medicare program. We do not offer every plan available in your area. Please contact Medicare.gov or 1-800-MEDICARE (1-800-633-4227) for a complete view of all your options.