Coordination of benefits denial: what it means and the letter to send
Editorial note (remove before publishing)
The build brief for this page calls for Sam's own first-person coordination-of-benefits story. No transcript of that real account exists in this codebase, so this page ships as a factual explainer instead of a fabricated personal narrative. Replace this note and the “What happened to me” section below with the real story before this page goes live — that first-person account is the highest-converting piece of content in the whole plan.
When you have two health insurance plans — for example, coverage through your own employer plus a spouse's plan — your insurers are supposed to coordinate benefits: one is primary, one is secondary, and together they cover your claim according to a coordination-of-benefits (COB) rule set. When that coordination fails — often because the hospital billed only one insurer, or because the COB paperwork on file is outdated — the claim can be denied or only partially paid, and the hospital bills you the full charge instead of following through with the secondary insurer.
What happened to me
[Placeholder — replace with the founder's real, first-person account: which two plans were involved, what the hospital billed, what the COB failure looked like on the EOB, and what happened after the dispute letter was sent.]
How to fix a COB failure
- Call both insurers and confirm which is primary and which is secondary on the date of service.
- Ask the secondary insurer to reprocess the claim with correct COB information.
- Send the hospital a formal letter citing your ERISA § 503 right to claim review (29 CFR § 2560.503-1) and request they hold collection activity while the secondary claim is reprocessed.
BillMender's free checker flags EOB-vs-bill mismatches automatically and drafts this letter for you.