^S12
SIU^S12 — Notification of New Appointment
Sent when a new appointment is booked in the scheduling system. It notifies downstream systems (RIS, procedure areas, room management) of the new appointment details including date, time, service, and patient.
When Is This Sent?
When a scheduler completes a new appointment booking. For radiology, this triggers the RIS to create the exam order and populate the modality worklist.
Real-World Usage
SIU^S12 is the standard appointment notification in radiology scheduling interfaces. Most RIS systems create imaging orders and populate the DICOM Modality Worklist (MWL) based on SIU^S12 messages from the hospital scheduling system. If exams aren't appearing on the modality worklist, trace back to whether the SIU^S12 reached the RIS and whether AIS.3 (service code) mapped to a known RIS procedure.
Message Structure
Segment names link to their field-level reference pages.
| # | Segment | Purpose in this message | Req | Repeat |
|---|---|---|---|---|
| 1 | MSH | Message header with SIU^S12 in MSH.9 | R | — |
| 2 | SCH | Scheduling details: appointment ID, timing, reason | R | — |
| 3 | PID | Patient demographics | R | — |
| 4 | PV1 | Patient visit context | R | — |
| 5 | AIS | Appointment information - service (procedure/exam being scheduled) | R | — |
| 6 | NTE | Scheduling notes/instructions | O | Yes |
| 7 | AIG | Appointment information - general resource (equipment) | O | Yes |
| 8 | AIL | Appointment information - location (room/suite) | O | Yes |
| 9 | AIP | Appointment information - personnel (technologist) | O | Yes |
| 10 | DG1 | Clinical indication/diagnosis | O | Yes |
Example Message
Realistic example with fake patient data. Paste into the HL7 Message Viewer to explore interactively.
1MSH||^~\&|EPIC_SCHED|HOSPITAL_A|MIRTH_PROD|RIS|20260311090000||SIU^S12^SIU_S12|SCH00001|P|2.5.1 2SCH||APT20260312001^EPIC_SCHED||||||71046^Chest 2 Views^CPT4||60^MIN|||||5678^Wilson^Dr.^Sarah 3PID||1||234567^^^HOSP_A^MR||Johnson^Sarah^L||19920601|F 4PV1||1|O|RADOUT^1^^HOSP_A||||5678^Wilson^Dr.^Sarah 5AIS||1||71046^Chest 2 Views^CPT4|||60^MIN
Troubleshooting Scenarios
New appointments not appearing in RIS after scheduling
Cause
AIS.3 (universal service identifier/procedure code) doesn't match the procedure catalog in the RIS.
Fix
Obtain the exact procedure codes the RIS expects. Build a mapping table between the scheduling system's procedure codes and the RIS procedure catalog. Apply the transformation in your interface engine.
Appointment date/time is incorrect in RIS
Cause
SCH.11 (appointment timing) component order doesn't match what the RIS expects. Start date/time is in a different component than configured.
Fix
Review SCH.11 component documentation for both sending and receiving systems. The standard format is QUANTITY^INTERVAL^DURATION^START_DATETIME^END_DATETIME, but implementations vary. Verify timezone handling if appointment times are off by hours.
Common Confusions
SIU^S12 (New appointment) vs ORM^O01 (New order). In radiology, you may receive BOTH for the same exam: an SIU^S12 from the scheduling system and an ORM^O01 from CPOE. The RIS needs to match these and avoid creating duplicate exams. The linkage is typically the accession number or the placer order number.
Related Message Types
Segment Reference
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