OMG^O19 — General Clinical Order Message
Generic clinical order for domains lacking their own order family: imaging, nursing care, consults, physiotherapy. The "Swiss army knife" v2.5+ successor of ORM.
Purpose
OMG^O19 is the generic order message introduced in v2.5. Where ORM^O01 remained a legacy envelope, OMG cleanly separates the order (OMG) from the response (ORG), supports grouping (parent/child via ORC-4 Placer Group Number) and the time sequence (TQ1 / TQ2). Used for RIS imaging requests, nursing orders, consult requests.
Segment structure
Structure OMG_O19: MSH, [SFT], [NTE], PID, [PD1], [PV1], [PV2], [IN1], [GT1], [AL1], [ORC, TQ1, [TQ2], OBR, [NTE], [CTD], [DG1], [OBX], [SPM], [FT1], [BLG]].
| Segment | Role |
|---|---|
ORC | Common Order — order #, status, urgency. |
TQ1 | Timing/Quantity — frequency, priority, first occurrence. |
OBR | Observation Request — requested act, modality. |
DG1 | Diagnosis — diagnosis justifying the request. |
Real-world example
MRI right knee order for suspected meniscus lesion:
MSH|^~\&|EHR|HOSP01|RIS|HOSP01|20260518093000||OMG^O19^OMG_O19|OMG19001|P|2.5.1|||AL|NE
PID|1||MR778800^^^HOSP^MR||VINCENT^ELODIE^^^MS.||19811119|F
PV1|1|I|RAD^^^HOSP01|||||DR_HUBERT^Hubert^Marc||||||||||||VN20260518092
ORC|NW|ORD20260518900||GRP1|||||20260518093000|||DR_HUBERT^Hubert^Marc||||||||IMG
TQ1|1|||||||20260518100000|||R
OBR|1|ORD20260518900||MRIKNEER^MRI Right Knee^L|||20260518100000|||||||||DR_HUBERT^Hubert^Marc|||||||||||||||
DG1|1|I10|M23.30^Old meniscus lesion, right knee^I10|M23.30 - Old meniscus lesion, right knee||A Response (ORG^O20)
MSH|^~\&|RIS|HOSP01|EHR|HOSP01|20260518093003||ORG^O20^ORG_O20|ORG20001|P|2.5.1
MSA|AA|OMG19001
PID|1||MR778800^^^HOSP^MR||VINCENT^ELODIE^^^MS.||19811119|F
ORC|OK|ORD20260518900|RIS20260518044|GRP1|IP|||20260518093002||||||||||IMG Common errors
- TQ1 missing: since v2.5, TQ1 replaces ORC-7 ; do not double-populate both (split source of truth).
- ORC-1 NW + ORC-5 SC: inconsistency — a New (NW) cannot already be Status Changed (SC).
- DG1 forgotten: some validations (PAMA in US, RUM/PMSI in FR) refuse a prescription without coded diagnosis.
- OMG vs OMI / OMP: OMI O23 = imaging-specific, OMP O09 = pharmacy-specific. Use the most specific available.