SIU^S14 — Notification of Appointment Modification

The message that notifies an attribute modification of an existing appointment: duration extended or shortened, procedure type modified, room or provider change, with date/time unchanged.

Purpose

S14 is used to signal a modification of an existing appointment that does not affect the date/time (covered by S13) nor its existence (covered by S15). Typical cases: 30-min consultation extended to 60 min (CPT 99213 → 99214), room change due to unavailability, provider replacement (Dr Jones absent, Dr Martin takes the consultation).

Segment structure

SIU_S14
  MSH                    Message Header
  SCH                    Scheduling Activity Information
  [ { NTE } ]            Notes
  [ { PID                Patient Identification (1..*)
    [ PD1 ]
    [ { PV1 } ]
    [ { PV2 } ]
    [ { OBX } ]
    [ { DG1 } ]
  } ]
  { RGS                  Resource Group Segment (1..*)
    { AIS | AIG | AIL | AIP }
    [ { NTE } ]
  }

Real-world example

Extension of a consultation from 30 to 60 min (CPT 99213 → 99214), room change from Cardio-101 to Cardio-202:

MSH|^~\&|SCHED|HOSP01|EHR|HOSP01|20260516140000||SIU^S14^SIU_S14|MSG-SIU-S14-001|P|2.5.1|||AL|NE
SCH|APP2026-042||APPT2026-042||1^Routine||CONS-LONG^Long consultation||60|min|^^^20260520093000^20260520103000|||||DRJONES^Jones^Sarah^^^DR.|+33142000000^^WORK||||DRJONES^Jones^Sarah^^^DR.|||||Modified
PID|1||MRN567890^^^HOSP^MR||DOE^JOHN^A^^MR.||19720515|M
PV1|1|O|CARDIO^^^HOSP01|||||DRJONES^Jones^Sarah^^^DR.
RGS|1|A
AIS|1|A|99214^Office visit, level 4^CPT||20260520093000|||||3600
AIL|1|A|CARDIO-202^^Cardiology Long Room 202^Cardiology Floor^^HOSP01
AIP|1|A|DRJONES^Jones^Sarah^^^DR.|RP^Responsible Provider^HL70443|20260520093000

• SCH-9 / SCH-10 = 60 min (was 30).
• SCH-7 = CONS-LONG (was CONS).
• SCH-25 = Modified.
• AIS-3 = CPT 99214 (was 99213).
• AIL-3 = Cardio-202 (was Cardio-101).

Acknowledgment (ACK)

MSH|^~\&|EHR|HOSP01|SCHED|HOSP01|20260516140001||ACK^S14^ACK|ACK-SIU-S14-001|P|2.5.1
MSA|AA|MSG-SIU-S14-001

Common errors

• S14 used for date change: for a reschedule, use S13. S14 is for modifications other than the date.
• No resource notification: if the room changes, the previously booked room must be released. The scheduling system must handle this de-allocation.
• SCH-1 modified: appointment ID must stay stable.
• Provider changed without cause: changing AIP without specifying the reason (NTE) can confuse the patient.
• Billing module not informed: a CPT change (99213 → 99214) impacts billing. Always relay to billing.

Related messages

See also: SIU^S12, SIU^S13, FHIR Appointment.