http://terminology.hl7.org/CodeSystem/v3-ParticipationType| Code | Display | Definition |
| SBJ | subject | The principle target on which the action happens. *Examples:* The patient in physical examination, a specimen in a lab observation. May also be a patient's family member (teaching) or a device or room (cleaning, disinfecting, housekeeping). *UsageNotes:* Not all direct targets are subjects. Consumables and devices used as tools for an act are not subjects. However, a device may be a subject of a maintenance action. |
| LOC | location | The facility where the service is done. May be a static building (or room therein) or a moving location (e.g., ambulance, helicopter, aircraft, train, truck, ship, etc.) |