| Code | Description | Version |
| ACK | General acknowledgment message | from v2.1 |
| ADR | ADT response | added v2.2 |
| ADT | ADT message | added v2.2 |
| ARD | Ancillary RPT (display) (for backward compatibility only) | from v2.1, removed after v2.3.1 |
| BAR | Add/change billing account | from v2.1 |
| BPS | Blood product dispense status message | added v2.5 |
| BRP | Blood product dispense status acknowledgement message | added v2.5 |
| BRT | Blood product transfusion/disposition acknowledgement message | added v2.5 |
| BTS | Blood product transfusion/disposition message | added v2.5 |
| CCF | Collaborative Care Fetch | added v2.7 |
| CCI | Collaborative Care Information | added v2.7 |
| CCM | Collaborative Care Message | added v2.7 |
| CCQ | Collaborative Care Referral | added v2.7 |
| CCU | Collaborative Care Referral | added v2.7 |
| CNQ | Cancel query | added v2.3, removed after v2.3 |
| CQU | Collaborative Care Referral | added v2.7 |
| CRM | Clinical study registration message | added v2.3.1 |
| CSU | Unsolicited study data message | added v2.3 |
| DFT | Detail financial transactions | added v2.2 |
| DOC | Document response | added v2.3 |
| DSR | Display response | from v2.1 |
| EAC | Automated equipment command message | added v2.4 |
| EAN | Automated equipment notification message | added v2.4 |
| EAR | Automated equipment response message | added v2.4 |
| EDR | Enhanced display response | added v2.3, removed after v2.5.1 |
| EHC | Health Care Invoice | added v2.6 |
| EQQ | Embedded query language query | added v2.3, removed after v2.5.1 |
| ERP | Event replay response | added v2.3, removed after v2.5.1 |
| ERQ | Event replay query | added v2.3, removed after v2.3 |
| ESR | Automated equipment status update acknowledgment message | added v2.4 |
| ESU | Automated equipment status update message | added v2.4 |
| INR | Automated equipment inventory request message | added v2.4 |
| INU | Automated equipment inventory update message | added v2.4 |
| LSR | Automated equipment log/service request message | added v2.4 |
| LSU | Automated equipment log/service update message | added v2.4 |
| MCF | Delayed Acknowledgment (Retained for backward compatibility only) | from v2.1, removed after v2.5.1 |
| MDM | Medical document management | added v2.3 |
| MFD | Master files delayed application acknowledgment | added v2.2 |
| MFK | Master files application acknowledgment | added v2.2 |
| MFN | Master files notification | added v2.2 |
| MFQ | Master files query | added v2.3 |
| MFR | Master files response | added v2.2 |
| NMD | Application management data message | added v2.2 |
| NMQ | Application management query message | added v2.2 |
| NMR | Application management response message | added v2.2 |
| OMB | Blood product order message | added v2.5 |
| OMD | Dietary order | added v2.4 |
| OMG | General clinical order message | added v2.4 |
| OMI | Imaging order | added v2.5 |
| OML | Laboratory order message | added v2.4 |
| OMN | Non-stock requisition order message | added v2.4 |
| OMP | Pharmacy/treatment order message | added v2.4 |
| OMS | Stock requisition order message | added v2.4 |
| OPL | Population/Location-Based Laboratory Order Message | added v2.6 |
| OPR | Population/Location-Based Laboratory Order Acknowledgment Message | added v2.6 |
| OPU | Unsolicited Population/Location-Based Laboratory Observation Message | added v2.6 |
| ORA | Observation Report Acknowledgment | added v2.7 |
| ORB | Blood product order acknowledgement message | added v2.5 |
| ORD | Dietary order acknowledgment message | added v2.4 |
| ORF | Query for results of observation | from v2.1 |
| ORG | General clinical order acknowledgment message | added v2.4 |
| ORI | Imaging order acknowledgement message | added v2.5 |
| ORL | Laboratory acknowledgment message (unsolicited) | added v2.4 |
| ORM | Pharmacy/treatment order message | from v2.1 |
| ORN | Non-stock requisition - General order acknowledgment message | added v2.4 |
| ORP | Pharmacy/treatment order acknowledgment message | added v2.4 |
| ORR | General order response message response to any ORM | from v2.1 |
| ORS | Stock requisition - Order acknowledgment message | added v2.4 |
| ORU | Unsolicited transmission of an observation message | from v2.1 |
| OSM | Specimen Shipment Message | added v2.7 |
| OSQ | Query response for order status | from v2.1 |
| OSR | Query response for order status | added v2.3 |
| OUL | Unsolicited laboratory observation message | added v2.4 |
| PEX | Product experience message | added v2.3 |
| PGL | Patient goal message | added v2.3 |
| PIN | Patient insurance information | added v2.3 |
| PMU | Add personnel record | added v2.4 |
| PPG | Patient pathway message (goal-oriented) | added v2.3 |
| PPP | Patient pathway message (problem-oriented) | added v2.3.1 |
| PPR | Patient problem message | added v2.3 |
| PPT | Patient pathway goal-oriented response | added v2.3 |
| PPV | Patient goal response | added v2.3 |
| PRR | Patient problem response | added v2.3 |
| PTR | Patient pathway problem-oriented response | added v2.3 |
| QBP | Query by parameter | added v2.4 |
| QCK | Deferred query | added v2.3 |
| QCN | Cancel query | added v2.4 |
| QRY | Query, original mode | added v2.2 |
| QSB | Create subscription | added v2.4 |
| QSX | Cancel subscription/acknowledge message | added v2.4 |
| QVR | Query for previous events | added v2.4 |
| RAR | Pharmacy/treatment administration information | added v2.2 |
| RAS | Pharmacy/treatment administration message | added v2.2 |
| RCI | Return clinical information | added v2.3 |
| RCL | Return clinical list | added v2.3 |
| RDE | Pharmacy/treatment encoded order message | added v2.2 |
| RDR | Pharmacy/treatment dispense information | added v2.2 |
| RDS | Pharmacy/treatment dispense message | added v2.2 |
| RDY | Display based response | added v2.4 |
| REF | Patient referral | added v2.3 |
| RER | Pharmacy/treatment encoded order information | added v2.2 |
| RGR | Pharmacy/treatment dose information | added v2.2 |
| RGV | Pharmacy/treatment give message | added v2.2 |
| ROC | Request clinical information | added v2.3, removed after v2.3 |
| ROD | Request pateint demographics | added v2.3, removed after v2.3 |
| ROR | Pharmacy/treatment order response | added v2.2 |
| RPA | Return patient authorization | added v2.3 |
| RPI | Return patient information | added v2.3 |
| RPL | Return patient display list | added v2.3 |
| RPR | Return patient list | added v2.3 |
| RQA | Request patient authorization | added v2.3 |
| RQC | Request clinical information | added v2.3 |
| RQI | Request patient information | added v2.3 |
| RQP | Request patient demographics | added v2.3 |
| RQQ | Event replay query | added v2.3, removed after v2.5.1 |
| RRA | Pharmacy/treatment administration acknowledgment message | added v2.2 |
| RRD | Pharmacy/treatment dispense acknowledgment message | added v2.2 |
| RRE | Pharmacy/treatment encoded order acknowledgment message | added v2.2 |
| RRG | Pharmacy/treatment give acknowledgment message | added v2.2 |
| RRI | Return referral information | added v2.3 |
| RSP | Segment pattern response | added v2.4 |
| RTB | Tabular response | added v2.4 |
| SCN | Notification of Anti-Microbial Device Cycle Data | added v2.6 |
| SDN | Notification of Anti-Microbial Device Data | added v2.6 |
| SDR | Sterilization anti-microbial device data request | added v2.6 |
| SIU | Schedule information unsolicited | added v2.3 |
| SLN | Notification of New Sterilization Lot | added v2.6 |
| SLR | Sterilization lot request | added v2.6 |
| SMD | Sterilization anti-microbial device cycle data request | added v2.6 |
| SPQ | Stored procedure request | added v2.3, removed after v2.5.1 |
| SQM | Schedule query message | added v2.3 |
| SQR | Schedule query response | added v2.3 |
| SRM | Schedule request message | added v2.3 |
| SRR | Scheduled request response | added v2.3 |
| SSR | Specimen status request message | added v2.4 |
| SSU | Specimen status update message | added v2.4 |
| STC | Notification of Sterilization Configuration | added v2.6 |
| STI | Sterilization item request | added v2.6 |
| SUR | Summary product experience report | added v2.3.1 |
| TBR | Tabular data response | added v2.3 |
| TCR | Automated equipment test code settings request message | added v2.4 |
| TCU | Automated equipment test code settings update message | added v2.4 |
| UDM | Unsolicited display update message | from v2.1 |
| VQQ | Virtual table query | added v2.3, removed after v2.5.1 |
| VXQ | Query for vaccination record | added v2.3 |
| VXR | Vaccination record response | added v2.3 |
| VXU | Unsolicited vaccination record update | added v2.3 |
| VXX | Response for vaccination query with multiple PID matches | added v2.3 |
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