Communication errors

Codes any exchange call can meet are recorded once, in the Other specification: the gateway's NHCX- codes, the standard payer codes, and the reference payer's structure and transport codes. The reference payer's other codes sit with the exchange they reject: coverage eligibility, preauthorisation, claim and insurance plan. Reading error codes explains the code spaces.

The Communication specification records no error code yet. That is a gap in the specification, not a promise that this module cannot fail.

Every code above is recorded in the specification that owns it. The aggregated list across modules is at error codes.

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