X12 837P SBR02 Field Guide: Individual Relationship Code Values and Common Mistakes
SBR02 has to agree with whatever the patient loop elsewhere in the claim implies about the subscriber relationship — when the two disagree, the claim doesn't fail on syntax, it fails on a payer edit that's much harder to trace back to this one field.
SBR02 is the Individual Relationship Code in an X12 837P claim — it states how the patient being treated relates to the subscriber who holds the insurance policy named in that SBR loop.
Valid code values
Example
The 18 following SBR01 is SBR02, indicating the patient is the subscriber. Synthetic claim data.
Where this trips people up
When SBR02 is 18 (self), most 837P implementation guides expect the claim to omit a separate patient loop and use the subscriber's demographics directly — test data that sets SBR02 to 18 but still builds out a distinct patient loop produces a claim that's internally contradictory, and payers vary widely in whether they catch it or just adjudicate against the wrong person.