AIS — Appointment Information - Service
Appears after SCH in SIU and SRM scheduling messages. One AIS per service required for the appointment.
The AIS segment identifies a service that is required for an appointment, such as a clinical service, room type, or procedure. Multiple AIS segments can appear for appointments requiring multiple services.
Real-World Context
AIS defines what actually needs to happen at the appointment. In radiology scheduling, AIS carries the procedure code and whether contrast is needed. In OR scheduling, AIS identifies the procedure(s) to be performed. If the wrong procedure shows up in the modality worklist, the AIS segment is where the error originated.
Field Reference
Click any row to see the full description, common values, and troubleshooting tip.
| # | Field Name | Type | Req | Max Len | |
|---|---|---|---|---|---|
| 1 | Set ID - AIS | SI | R | 4 | ▶ |
| 2 | Segment Action Code | ID | O | 3 | ▶ |
| 3 | Universal Service Identifier | CE | R | 250 | ▶ |
| 4 | Start Date/Time | TS | O | 26 | ▶ |
| 5 | Start Date/Time Offset | NM | O | 20 | ▶ |
| 6 | Start Date/Time Offset Units | CE | O | 250 | ▶ |
| 7 | Duration | NM | O | 20 | ▶ |
| 8 | Duration Units | CE | O | 250 | ▶ |
| 9 | Allow Substitution Code | IS | O | 10 | ▶ |
| 10 | Filler Status Code | CE | O | 250 | ▶ |
| 11 | Placer Supplemental Service Information | CE | O | 250 | ▶ |
| 12 | Filler Supplemental Service Information | CE | O | 250 | ▶ |
Example Segment
1AIS||1||71046^Chest 2 views^CPT4|20260315100000|0|MIN^Minutes^UCUM|30|MIN^Minutes^UCUM|N|PND^Pending|STAT^Stat priority
Related Segments
Used In Message Types
Parse messages with AIS in real time
Paste any HL7 message into our free viewer. Decodes every segment and field instantly, client-side.
Open HL7 Message Viewer →Need HL7 mapping templates?
The HL7 Integration Toolkit includes field mapping worksheets, interface spec templates, and a go-live checklist for every major HL7 message type.
View HL7 Integration Toolkit →