HL7 SIU Message

The HL7 SIU message notifies an auxiliary (or other similarly configured) application of changes to some facet of the filler application’s appointment schedule. There are 14 different trigger events for the SIU message, but they all use a common message format.

The fourteen SIU messages include:

  • SIU-S12 – Notification of new appointment booking
  • SIU-S13 – Notification of appointment rescheduling
  • SIU-S14 – Notification of appointment modification
  • SIU-S15 – Notification of appointment cancellation
  • SIU-S16 – Notification of appointment discontinuation
  • SIU-S17 – Notification of appointment deletion
  • SIU-S18 – Notification of addition of service/resource on appointment
  • SIU-S19 – Notification of modification of service/resource on appointment
  • SIU-S20 – Notification of cancellation of service/resource on appointment
  • SIU-S21 – Notification of discontinuation of service/resource on appointment
  • SIU-S22 – Notification of deletion of service/resource on appointment
  • SIU-S23 – Notification of blocked schedule time slot(s)
  • SIU-S24 – Notification of opened (“un-blocked”) schedule time slot(s)
  • SIU-S26 – Notification that patient did not show up for scheduled appointment

The segments and groups of segments in the SIU message are as follows, and apply for all trigger events:

MSH Message header Required
SCH Schedule activity information Required
NTE Notes and comments Optional, Repeatable
PatientGroup – Optional and repeatable group
PID Patient identification Required
PV1 Patient visit Optional
PV2 Patient visit – additional info Optional
OBX Observation Optional, Repeatable
DG1 Diagnosis Optional, Repeatable
ResourceGroup – Repeatable group
RGS Resource group Required
ServiceGroup – Optional and repeatable group, part of ResourceGroup
AIS Appointment information – service Required
NTE-1 Notes and comments Optional, Repeatable
GeneralGroup – Optional and repeatable group, part of ResourceGroup
AIG Appointment information – General resource Required
NTE-2 Notes and comments Optional, Repeatable
LocationGroup – Optional and repeatable group, part of ResourceGroup
AIL Appointment information – Location resource Required
NTE-3 Notes and comments Optional, Repeatable
PersonnelGroup – Optional and Repeatable, part of ResourceGroup
AIP Appointment information – Personnel resource Required
NTE-4 Notes and comments Optional, Repeatable

In HL7 pipe and hat format, the SIU-S14 message would look like this:


SCH|00331839401|||||58||HLCK^HEALTHCHECK ANY AGE|20|MIN|^^^200803061000


PID|1||489671|0|SMITH^MICHAEL^||20080205|F|||176215TH STREET^HOUSTON^TX^77306||(832)795-


PV1|1|O|||||HHR^NGUYENSUSAN MD|^||||||||||||||||||||||||||||||||||| ||||||||||


AIL|1||HHR^FPCS NGUYEN, MD||||||||||




 Want to learn more about HL7? Enroll in Lyniate Academy’s HL7 training course here!

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