Questions & answers · Health insurance
I have Medicare and also retiree coverage or COBRA from a past job. Which one pays first?
Health insuranceWho paysChecked Nov 6, 2026
From K.Actuary, founded by Sangmin Kwon, ASA · sources checked 2026-11-06 · Source: CMS · Medicare and Other Health Benefits: Your Guide to Who Pays First (Pub. 02179) · PDF text · PDF page 7 View original ↗
In short
- If you are 65 or older and retired, Medicare pays first for your retiree coverage.
- With COBRA, Medicare pays first if you are 65 or older, or disabled.
- With kidney failure (ESRD), COBRA pays first for up to 30 months.
What this means
This is from Medicare's own guide.
If you are 65 or older, retired, and have retiree coverage from a group plan of your or your spouse's former employer, Medicare pays first and the group plan pays second [1]. If you have Medicare and COBRA, and you have Medicare because you are 65 or over or because you have a disability, Medicare pays first [2].
The rule is different for people who are eligible for Medicare because of ESRD (kidney failure). Then COBRA pays first and Medicare pays second for up to 30 months after you are first eligible for Medicare [3].
If your plan is second, you may need to sign up for Medicare Part B before it will pay [4]. We do not have your plan. Don't know yet if your plan adds anything. Ask your plan.
Your next step
Write down which kind of coverage you have (retiree plan or COBRA) and why you have Medicare (age, disability, or ESRD). Then ask your plan, in writing, if it pays first or second for you.
Check it yourself
Open the Medicare guide above and read the parts on retiree coverage and COBRA. The guide sets no deadline for this.
Where this comes from (4)
[1] CMS · Medicare and Other Health Benefits: Your Guide to Who Pays First (Pub. 02179) · PDF text · PDF page 7 · checked 2026-11-06
You’re 65 or older, retired, and have retiree coverage from a group health insurance plan through your (or your spouse’s) former employer. Who pays first? Medicare pays first, and your (or your spouse’s) group health plan pays second.
[2] CMS · Medicare and Other Health Benefits: Your Guide to Who Pays First (Pub. 02179) · PDF text · PDF page 8 · checked 2026-11-06
If you have Medicare because you’re 65 or over, or because you have a disability, Medicare pays first.
[3] CMS · Medicare and Other Health Benefits: Your Guide to Who Pays First (Pub. 02179) · PDF text · PDF page 8 · checked 2026-11-06
If you’re eligible for Medicare because of ESRD, COBRA pays first, and Medicare pays second during a coordination period that lasts up to 30 months after you’re first eligible for Medicare.
[4] CMS · Medicare and Other Health Benefits: Your Guide to Who Pays First (Pub. 02179) · PDF text · PDF page 4 · checked 2026-11-06
If your group health plan or retiree coverage is the secondary payer, you may need to sign up for Medicare Part B before they’ll pay.
How we found this
We matched your question to 4 official sources, quoted the exact lines, and re-checked each quote against its source on 2026-11-06.
What we don’t know yet
Your own plan or notice may say something different. If your letter cites another rule, send it and we will look again.
Every answer is checked against the official rule it quotes.
Information only — not legal advice. Your plan, insurer or agency decides.
This answer quotes the official sources listed above, with the date we checked them. Your own policy, notice and state rules control. We are not your lawyer or your insurer. We don’t file, argue or negotiate claims for you — you send any letter or form yourself.
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