^S13
SIU^S13 — Notification of Appointment Cancellation
SIU^S13 notifies downstream systems that a previously scheduled appointment has been cancelled. It triggers the receiving system (RIS, procedure area) to remove the appointment from the schedule and release associated resources.
When Is This Sent?
When a scheduler cancels a booked appointment in the scheduling system. This fires after a patient or clinician requests cancellation and the change is committed.
Real-World Usage
SIU^S13 is critical for keeping RIS schedules and modality worklists accurate. Without it, cancelled appointments remain on the modality worklist, causing technologists to waste time preparing for patients who won't arrive. A common gap is that SIU^S12 (new appointment) is configured but SIU^S13 (cancel) is not — resulting in orphaned worklist entries.
Message Structure
Segment names link to their field-level reference pages.
| # | Segment | Purpose in this message | Req | Repeat |
|---|---|---|---|---|
| 1 | MSH | Message header with SIU^S13 in MSH.9 | R | — |
| 2 | SCH | Scheduling activity information — SCH.1 identifies the appointment being cancelled | R | — |
| 3 | PID | Patient demographics | R | — |
| 4 | PV1 | Patient visit context | R | — |
| 5 | AIS | Appointment information — service that was scheduled | R | — |
| 6 | NTE | Cancellation reason notes | O | Yes |
| 7 | AIG | Resource (equipment) that was allocated | O | Yes |
| 8 | AIP | Personnel (technologist) that was allocated | 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|20260312083000||SIU^S13^SIU_S13|SCH00010|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
Troubleshooting Scenarios
Cancelled appointments remain on modality worklist
Cause
RIS is receiving SIU^S13 but is not configured to cancel the corresponding worklist entry. The mapping between SCH.1 (appointment ID) and the RIS accession number is missing.
Fix
Configure the RIS interface to map SCH.1 to the internal appointment or accession number. Verify the RIS cancellation logic is triggered by S13 event type. Test end-to-end with a test patient.
SIU^S13 causes a new appointment to be created instead of cancelling
Cause
Downstream system treats all SIU messages identically (as new appointments) because it only processes the SCH segment without checking the trigger event code.
Fix
Ensure the downstream system processes the trigger event (MSH.9 component 2 = S13) and routes SIU^S13 to a cancellation handler, not a creation handler.
Common Confusions
SIU^S13 (Cancel) vs SIU^S15 (Discontinue) vs SIU^S17 (Delete). S13 cancels a specific appointment occurrence. S15 discontinues a recurring appointment series going forward. S17 deletes an appointment record entirely (often used for data correction). Most RIS implementations only support S13 — check vendor documentation.
Related Message Types
Segment Reference
Paste this message into our viewer
Interactive HL7 parser. Decodes every field, validates structure, highlights errors. Free, no signup.
Open HL7 Message Viewer →Need mapping templates?
The HL7 Integration Toolkit includes field mapping worksheets and interface spec templates for every major HL7 message type including SIU^S13.
View HL7 Integration Toolkit →