This case-sensitive code system http://terminology.hl7.org/CodeSystem/diagnosis-role defines the following codes:
| Code | Display | Definition |
| AD | Admission diagnosis | The diagnoses documented for administrative purposes as the basis for a hospital or other institutional admission |
| DD | Discharge diagnosis | The diagnoses documented for administrative purposes at the time of hospital or other institutional discharge |
| CC | Chief complaint | |
| CM | Comorbidity diagnosis | |
| pre-op | pre-op diagnosis | |
| post-op | post-op diagnosis | |
| billing | Billing | The diagnosis documented for billing purposes |