AAA03 — Reject Reason Code (X12 element 901)
43 — Invalid/Missing Provider Identification
Draft — pending verification
This reference entry has not yet been verified against its authoritative source (X12 005010X217 TR3 / element 901 code list — verify against licensed copy). Do not rely on it for production configuration until this notice is removed.
How 43 is used
Returned in AAA03 at the provider loop that failed. Root causes split between genuinely wrong NPIs and payer provider-file gaps — the fix differs, so capture which loop rejected.
Example
A requesting provider NPI keyed with a transposed digit returns AAA03 = 43.
Where it lives in the transaction
43 is a value of AAA03 — Reject Reason Code (X12 element 901), carried in the AAA (Request Validation), 278 response — returned at the loop level where the problem was found of the 278 Health Care Services Review — Response (005010X217). For the payer-side view of how PA Bridge normalizes these codes across X12 and FHIR intake, see the articles section.