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Ohio Medicare Q&A

Can I have Medicare and employer insurance in Ohio?

Yes — you can have both Medicare and employer health insurance. Which one pays first depends on the employer's size: 20 or more employees, the employer plan pays first and Medicare is secondary. Fewer than 20 employees, Medicare pays first. Getting this wrong can leave you with major uncovered medical bills.

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The 20-employee rule

Medicare's Medicare Secondary Payer (MSP) rules treat large and small employers very differently:

  • 20+ employees: employer plan is primary, Medicare is secondary. You can delay Part B enrollment without penalty until employer coverage ends.
  • Fewer than 20 employees: Medicare is primary, employer plan is secondary. You should enroll in Parts A and B at 65 even while working — otherwise the small-employer plan can refuse to pay what Medicare would have covered.

Verify your employer's size with HR — and get it in writing if you're near the threshold.

If you're working past 65 with a large Ohio employer

Most large-employer employees can safely delay Part B without penalty. Common options:

  • Take premium-free Part A only, delay Part B until employer coverage ends. Most common choice.
  • Take both Part A and Part B if your employer plan has very high deductibles and Medicare's secondary coverage would help.
  • Decline both A and B if you're contributing to an HSA — but verify the timing carefully (see our HSA & Medicare guide).

When employer coverage ends

You get an 8-month Special Enrollment Period for Part B (and a 2-month SEP for Medicare Advantage/Part D) when active employee coverage ends. The clock starts when you lose coverage — not when COBRA ends. This is the single most expensive Medicare mistake people make: assuming COBRA gives them more time to enroll in Part B. It doesn't.

Retiree coverage and Medicare

If you've already retired and have retiree health coverage from a former employer (or a former employer's plan administrator), Medicare is primary. Most retiree plans require Medicare enrollment as a condition of coverage — meaning if you don't enroll in Parts A and B at 65, the retiree plan may decline to pay anything.

HSA conflict

You cannot contribute to a Health Savings Account in any month you're enrolled in any part of Medicare — including premium-free Part A. If you're contributing to an HSA at 65 and want to continue, you'd need to actively decline Medicare enrollment, which means not signing up for Social Security yet. See our HSA & Medicare guide for the 6-month lookback rule that catches many Ohio HSA holders by surprise.

Frequently asked

+Should I sign up for Medicare at 65 if I'm still working in Ohio?
Depends on your employer's size. 20+ employees: usually take only premium-free Part A and delay Part B. Under 20 employees: usually take both at 65 because Medicare becomes primary.
+Does COBRA count as creditable coverage for Medicare?
COBRA is creditable for Part D (prescription drugs) only. It is NOT creditable for Part B — your Part B SEP clock starts when active employer coverage ends, not when COBRA ends.
+Can my spouse's employer plan delay my Medicare?
If your spouse's employer has 20+ employees and you're covered as a dependent, yes — you can typically delay Part B without penalty until that coverage ends.

Related

Medicare and employer coverage Working past 65 in Ohio Part B Special Enrollment Period
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