The exact method depends on your practice’s connectivity to HAP. Below are the three most common pathways.

| Test Case | Auth Code | Loop/Qualifier | Result | | :--- | :--- | :--- | :--- | | 1 | 1234567890 | 2300 / REFG1 | ✅ Accepted | | 2 | ABC123 | 2300 / REFG1 | ❌ Reject (Non-numeric) | | 3 | 1234567890 | 2300 / REF*EW | ❌ Reject (Wrong qualifier) | | 4 | (Blank) | N/A | ❌ Reject (Missing) |

For high-volume providers:

Tip: Consult your EDI vendor’s HAP companion guide – the field for “Update Indicator” is often in Loop 2010AA or 2300.