An auto accident claim that omits the state code inside CLM11 can sit in limbo — the payer knows the injury may involve another liable party but has no jurisdiction to route the coordination-of-benefits inquiry to.
Quick answer
CLM11 is the Related Causes Information composite in an X12 837P claim — it tells the payer whether the condition being billed is related to an accident, employment, or another liable party, so the claim can be routed for coordination of benefits.
What this element contains
CLM11-1
Related-Causes Code — e.g. AA (auto accident), EM (employment), OA (other accident)
CLM11-2
Related-Causes Code (second) — optional second cause, e.g. combining employment with an accident
CLM11-3
Related-Causes Code (third) — rarely used third cause slot
CLM11-4
Auto Accident State or Province Code — required when an auto accident cause is present, identifies jurisdiction
CLM11-5
Country Code — used when the accident occurred outside the US
Example
Synthetic example Generated by Synthibase
CLM*ACCT66392*890.00***11:B:1*Y*A*Y*Y*P*AA:::TX*
AA:::TX in CLM11 marks the claim as related to an auto accident that occurred in Texas. Synthetic claim data.
Where this trips people up
Test suites that exercise CLM11 at all almost always stop at CLM11-1 (the cause code) and skip CLM11-4 — but many payers require the state code whenever an auto-accident cause is present, so claims that pass structural validation still get denied or routed for manual COB review because the jurisdiction field was left empty.
Test accident and liability scenarios end to end
Synthibase generates synthetic 837P claims with fully populated CLM11 composites — cause codes, state, and country — so coordination-of-benefits routing gets tested before real accident claims hit production.
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This page is written independently by Synthibase for testing and informational purposes. It is not an official publication of HL7 International or X12/Washington Publishing Company, and is not a substitute for reviewing the official standard or your trading partner's companion guide. See our
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