| Code | Display | Definition | V2 Concept Comment | V2 Concept Comment As Published |
| OR | Original Invoice | Original Invoice | | |
| CN | Cancel Invoice | Cancel Invoice | Can be used to reverse or cancel an invoice in progress or reverse a paid invoice. Receiver may only mark Invoice as cancelled, not purge records | Can be used to reverse or cancel an invoice in progress or reverse a paid invoice. Receiver may only mark Invoice as cancelled, not purge records |
| CG | Cancel Invoice Product/Service Group | Cancel Invoice Product/Service Group | Cancel a specific Product/Service Group in an Invoice | Cancel a specific Product/Service Group in an Invoice |
| CL | Cancel Invoice Product/Service Line Item | Cancel Invoice Product/Service Line Item | Cancel a specific Product/Service Line Item in an Invoice | Cancel a specific Product/Service Line Item in an Invoice |
| PD | Pre-Determination Invoice | Pre-Determination Invoice | Can be used to submit an invoice through a Payer's edit and adjudication engine to determine if the invoice will be paid - does not result in payment by Payer | Can be used to submit an invoice through a Payer's edit and adjudication engine to determine if the invoice will be paid - does not result in payment by Payer |
| RA | Re-Assessment | Re-Assessment | Used on EHC^E04 only | Used on EHC^E04 only |
| OA | Original Authorization | Original Authorization | | |
| SA | Special Authorization | Special Authorization | | |
| AI | Combined Authorization and Adjudication request | Combined Authorization and Adjudication request | | |
| PA | Pre-Authorization | Pre-Authorization | | |
| AA | Authorization request for inpatient admission | Authorization request for inpatient admission | | |
| EA | Authorization request for inpatient stay extension | Authorization request for inpatient stay extension | | |
| RC | Referral Pre-Authorization | Referral Pre-Authorization | | |
| CA | Cancel Authorization request | Cancel Authorization request | | |
| CP | Copy of Invoice | Copy of Invoice | | |
| CQ | Coverage Register Query | Coverage Register Query | | |
| RU | Referral authorization | Referral authorization | | |