Message Types
122 message types in HL7 v2.5
§2.16.1 Message Type Table:Message types identify the purpose and content category of an HL7 message. Each type (e.g., ADT, ORM, ORU) represents a specific clinical or administrative domain and groups related trigger events that share common processing requirements.
ACK
General Acknowledgment Message
135 response•General
ADR
ADT Response
1 response•ADT Response
ADT
ADT Message
57 trigger•Patient Admin
BAR
Add/Change Billing Account
6 trigger•Billing
BPS
Blood Product Dispense Status Message
BPS_O29•Blood Product
BRP
Blood Product Dispense Status Acknowledgement Message
BRP_O30•Blood Product
BRT
Blood Product Transfusion/Disposition Acknowledgement Message
BRT_O32•Blood Product
BTS
Blood Product Transfusion/Disposition Message
BTS_O31•Blood Product
CRM
Clinical Study Registration Message
8 trigger•Clinical Study
CSU
Unsolicited Study Data Message
4 trigger•Clinical Study
DFT
Detail Financial Transactions
2 trigger•Financial
DOC
Document Response
1 response•Medical Docs
DSR
Display Response
11•Display Response
EAC
Automated Equipment Command Message
EAC_U07•Equipment
EAN
Automated Equipment Notification Message
EAN_U09•Equipment
EAR
Automated Equipment Response Message
EAR_U08•Equipment
EDR
Enhanced Display Response
11•Display Response
EQQ
Embedded Query Language Query
EQQ_Q04•Query
ERP
Event Replay Response
1 response•Query Response
ESR
Automated Equipment Status Update Acknowledgment Message
ESR_U02•Equipment Status
ESU
Automated Equipment Status Update Message
ESU_U01•Equipment Status
INR
Automated Equipment Inventory Request Message
INR_U06•Inventory
INU
Automated Equipment Inventory Update Message
INU_U05•Inventory
LSR
Automated Equipment Log/Service Request Message
LSR_U13•Equipment
LSU
Automated Equipment Log/Service Update Message
LSU_U12•Equipment
MDM
Medical Document Management
11 trigger•Medical Docs
MFK
Master Files Application Acknowledgment
15 response•Master Files
MFN
Master Files Notification
15 trigger•Master Files
MFQ
Master Files Query
14 trigger•Master Files
MFR
Master Files Response
14 response•Master Files
NMD
Application Management Data Message
NMD_N02•Application Mgmt
NMQ
Application Management Query Message
NMQ_N01•Application Mgmt
NMR
Application Management Response Message
1 response•Application Mgmt
NUL
No Message Required (for Referential Integrity)
8121•General
OMB
Blood Product Order Message
OMB_O27•Blood Product
OMD
Dietary Order
OMD_O03•Diet Orders
OMG
General Clinical Order Message
OMG_O19•General Orders
OMI
Imaging Order
OMI_O23•Imaging Orders
OML
Laboratory Order Message
3 trigger•Lab Orders
OMN
Non-stock Requisition Order Message
OMN_O07•Non-Stock Orders
OMP
Pharmacy/Treatment Order Message
OMP_O09•Pharmacy
OMS
Stock Requisition Order Message
OMS_O05•Stock Requisition
ORB
Blood Product Order Acknowledgement Message
ORB_O28•Blood Product
ORD
Dietary Order Acknowledgment Message
ORD_O04•Diet Orders
ORF
Query for Results of Observation
ORF_R04•Observations
ORG
General Clinical Order Acknowledgment Message
ORG_O20•General Orders
ORI
Imaging Order Acknowledgement Message
ORI_O24•Imaging Orders
ORL
Laboratory Acknowledgment Message (unsolicited)
3 trigger•Lab Orders
ORM
Pharmacy/Treatment Order Message
ORM_O01•Orders
ORN
Non-stock Requisition - General Order Acknowledgment Message
ORN_O08•Non-Stock Orders
ORP
Pharmacy/Treatment Order Acknowledgment Message
ORP_O10•Pharmacy Ack
ORR
General Order Response Message Response to Any ORM
ORR_O02•Order Response
ORS
Stock Requisition - Order Acknowledgment Message
ORS_O06•Stock Requisition
ORU
Unsolicited Transmission of an Observation Message
4 trigger•Observations
OSQ
Query Response for Order Status
OSQ_Q06•Order Status
OSR
Query Response for Order Status
1 response•Order Status
OUL
Unsolicited Laboratory Observation Message
4 trigger•Lab Observations
PEX
Product Experience Message
2 trigger•Product Experience
PGL
Patient Goal Message
3 trigger•Patient Goal
PIN
Patient Insurance Information
PIN_I07•Patient Info
PMU
Add Personnel Record
8 trigger•Personnel
PPG
Patient Pathway Message (goal-oriented)
3 trigger•Pathway
PPP
Patient Pathway Message (problem-oriented)
3 trigger•Pathway
PPR
Patient Problem Message
3 trigger•Pathway
PPT
Patient Pathway Goal-oriented Response
PPT_PCL•Pathway
PPV
Patient Goal Response
PPV_PCA•Patient Goal
PRR
Patient Problem Response
PRR_PC5•Problem
PTR
Patient Pathway Problem-oriented Response
PTR_PCF•Pathway
QBP
Query by Parameter
22 trigger•Query
QCK
Query General Acknowledgment
1 response•Query Ack
QCN
Cancel Query
QCN_J01•Query Cancel
QRY
Query, Original Mode
14 trigger•Query
QSB
Create Subscription
2 trigger•Subscription
QSX
Cancel Subscription/Acknowledge Message
QSX_J02•Subscription Cancel
QVR
Query for Previous Events
QVR_Q17•Query
RAR
Pharmacy/Treatment Administration Information
1 response•Pharmacy Response
RAS
Pharmacy/Treatment Administration Message
RAS_O17•Pharmacy Admin
RCI
Return Clinical Information
1 response•Referral
RCL
Return Clinical List
1 response•Referral
RDE
Pharmacy/Treatment Encoded Order Message
2 trigger•Pharmacy
RDR
Pharmacy/Treatment Dispense Information
1 response•Pharmacy Response
RDS
Pharmacy/Treatment Dispense Message
RDS_O13•Pharmacy Dispense
RDY
Display Based Response
3 trigger•Display Response
REF
Patient Referral
4 trigger•Referral
RER
Pharmacy/Treatment Encoded Order Information
1 response•Pharmacy Response
RGR
Pharmacy/Treatment Dose Information
1 response•Pharmacy Response
RGV
Pharmacy/Treatment Give Message
RGV_O15•Pharmacy
ROR
Pharmacy/Treatment Order Response
1 response•Pharmacy Response
RPA
Return Patient Authorization
4 response•Referral Response
RPI
Return Patient Information
2 response•Referral Response
RPL
Return Patient Display List
1 response•Referral Response
RPR
Return Patient List
1 response•Referral Response
RQA
Request Patient Authorization
4 trigger•Referral
RQC
Request Clinical Information
2 trigger•Referral
RQI
Request Patient Information
3 trigger•Referral
RQP
Request Patient Demographics
RQP_I04•Referral
RQQ
Event Replay Query
RQQ_Q09•Query
RRA
Pharmacy/Treatment Administration Acknowledgment Message
RRA_O18•Pharmacy Ack
RRD
Pharmacy/Treatment Dispense Acknowledgment Message
RRD_O14•Pharmacy Ack
RRE
Pharmacy/Treatment Encoded Order Acknowledgment Message
2 trigger•Pharmacy Ack
RRG
Pharmacy/Treatment Give Acknowledgment Message
RRG_O16•Pharmacy Ack
RRI
Return Referral Information
4 response•Referral
RSP
Segment Pattern Response
12 trigger•Response
RTB
Tabular Response
62•Query Response
SIU
Schedule Information Unsolicited
14 trigger•Scheduling
SPQ
Stored Procedure Request
SPQ_Q08•Query
SQM
Schedule Query Message
SQM_S25•Scheduling
SQR
Schedule Query Response
1 response•Scheduling
SRM
Schedule Request Message
11 trigger•Scheduling
SRR
Scheduled Request Response
11 response•Scheduling
SSR
Specimen Status Request Message
SSR_U04•Lab Automation
SSU
Specimen Status Update Message
SSU_U03•Lab Automation
SUR
Summary Product Experience Report
SUR_P09•Summary
TBR
Tabular Data Response
1 response•Query Response
TCR
Automated Equipment Test Code Settings Request Message
TCR_U11•Test Code
TCU
Automated Equipment Test Code Settings Update Message
TCU_U10•Test Code
UDM
Unsolicited Display Update Message
UDM_Q05•Unsolicited
VQQ
Virtual Table Query
VQQ_Q07•Query
VXQ
Query for Vaccination Record
VXQ_V01•Immunization
VXR
Vaccination Record Response
VXR_V03•Immunization
VXU
Unsolicited Vaccination Record Update
VXU_V04•Immunization
VXX
Response for Vaccination Query With Multiple PID Matches
VXX_V02•Immunization