v50

latestOpenAPI 3.1.0Proprietaryraw.githubusercontent.com2026-07-24226771.6 MB
Coordination of benefits

Submit a coordination of benefits (COB) check in JSON format

post/coordination-of-benefits

Request body

tradingPartnerServiceIdstring required

The payer ID. Visit the Payer Network for a complete list of supported payers for COB checks.

  • Each check must be for a participating health plan for which the patient has coverage. For example, if the patient has coverage from Cigna and UnitedHealthcare, a COB check to Aetna will return an error.
  • Medicare and Medicare Advantage plans aren't supported. If you submit a COB check for a Medicare or Medicare Advantage plan, the request will fail with an AAA = 75 error (Subscriber/Insured Not Found).
  • Ensure that you're sending the request to the correct payer entity. For example, Blue Cross Blue Shield (BCBS) has multiple entities that operate in different states. If you send a request to the wrong entity, the request will fail with an AAA = 75 error (Subscriber/Insured Not Found).
  • You must include leading 0 characters - payer IDs are alphanumeric strings and must be treated as complete strings, not integers. For example, use 00540 for SISCO, not 540.

Response

CoordinationOfBenefits 200 response