Enrollment

Do I need Medicare if I have employer insurance?

It depends on the size of the employer. If your (or your spouse’s) employer has 20 or more employees, that group coverage usually pays first and you can often delay Part B without penalty. If the employer has fewer than 20 employees, Medicare usually pays first, so you typically need to enroll at 65 to avoid gaps and penalties.

Reviewed by Scott Stafford, Licensed Insurance Agent

Last updated

It comes down to employer size

Whether you need Medicare at 65 while you’re still working hinges on how many people your employer (or your spouse’s employer) has:

  • 20 or more employees. The group health plan generally pays first and Medicare pays second. You can usually delay Part B without a penalty and pick it up later through a Special Enrollment Period when the job or coverage ends.
  • Fewer than 20 employees. Medicare generally pays first, so the group plan may pay little until you’re enrolled. In this case you typically need to take Part A and Part B at 65 to avoid gaps and penalties.

Either way, most people take premium-free Part A at 65 since it usually costs nothing. The real decision is about Part B, which carries a monthly premium of $202.90 at the standard 2026 rate.

Two things that trip people up

HSA contributions stop once you’re on Medicare. If you’re contributing to a health savings account, enrolling in any part of Medicare — including premium-free Part A — ends your eligibility to contribute. Many people delay all of Medicare while still funding an HSA.

COBRA and retiree coverage don’t count for Part B. They aren’t treated as active employer coverage, so they don’t give you a Special Enrollment Period for Part B. If you’re on COBRA at 65, you generally still need to enroll in Part B on time to avoid a lifelong late-enrollment penalty.

What to do

Ask your benefits administrator two questions: how many employees the company has, and whether the plan is considered creditable for Part D (drug) coverage. Those answers tell you whether you can safely wait or should enroll now. When the job coverage ends, your Part B Special Enrollment Period runs for eight months.

Common questions

Medicare with employer insurance FAQ

Can I delay Part B if I have insurance through my job?
Usually yes, if the employer has 20 or more employees and the coverage is active (not COBRA or retiree coverage). You’ll get a Special Enrollment Period to add Part B without penalty when the job or coverage ends. If the employer has fewer than 20 employees, you generally need Part B at 65.
Does COBRA count as employer coverage for Medicare?
No. COBRA and retiree coverage aren’t considered active employer coverage for Medicare, so they don’t give you a Special Enrollment Period for Part B. If you’re relying on COBRA at 65, you typically still need to enroll in Part B on time to avoid a permanent late-enrollment penalty.
Can I keep contributing to my HSA after 65 if I keep working?
Only if you delay all of Medicare, including premium-free Part A. Enrolling in any part of Medicare ends your eligibility to contribute to a health savings account, though you can still spend what’s already in it.

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