Segments
Contents
Segments of a message may be required or optional. They may occur only once in a message or they may be allowed to repeat. Each segment is given a name. Each segment is identified by a unique three-character code known as the Segment ID. All segment ID codes beginning with the letter Z are reserved for locally defined segments. This table lists some common segments:
| Name | Description |
|---|---|
| MSH | Message Header |
| EVN | Event Type |
| PID | Patient Identification |
| PV1 | Patient Visit |
| PV2 | Patient Visit – Additional Information |
| NK1 | Next of Kin / Associated Parties |
| AL1 | Patient Allergy Information |
| IAM | Patient Adverse Reaction Information |
| IAR | Allergy Reaction |
| NPU | Bed Status Update |
| MRG | Merge Patient Information |
| PD1 | Additional Patient Demographics |
| DB1 | Disability |
| PDA | Patient Death and Autopsy |
| ARV | Access Restrictions |
Continue: Null, Empty and Invalid Values