| Code | Display | Definition | deprecated | V2 Concept Comment | V2 Concept Comment As Published |
| ACK | General acknowledgment message | General acknowledgment message | | 2 | 2 |
| ADR | ADT response | ADT response | | 3 - Deprecated | 3 - Deprecated |
| ARD | Ancillary RPT (display) (for backward compatibility only) | Ancillary RPT (display) (for backward compatibility only) | 2.9 | | |
| ADT | ADT message | ADT message | | 3 | 3 |
| BAR | Add/change billing account | Add/change billing account | | 6 | 6 |
| BPS | Blood product dispense status message | Blood product dispense status message | | 4 | 4 |
| CNQ | Cancel query | Cancel query | 2.9 | | |
| BRP | Blood product dispense status acknowledgement message | Blood product dispense status acknowledgement message | | 4 | 4 |
| BRT | Blood product transfusion/disposition acknowledgement message | Blood product transfusion/disposition acknowledgement message | | 4 | 4 |
| BTS | Blood product transfusion/disposition message | Blood product transfusion/disposition message | | 4 | 4 |
| CCF | Collaborative Care Fetch | Collaborative Care Fetch | | 7 | 7 |
| CCI | Collaborative Care Information | Collaborative Care Information | | 7 | 7 |
| CCM | Collaborative Care Message | Collaborative Care Message | | 7 | 7 |
| CCQ | Collaborative Care Referral | Collaborative Care Referral | | 7 | 7 |
| ERQ | Event replay query | Event replay query | 2.9 | | |
| CCU | Collaborative Care Referral | Collaborative Care Referral | | 7 | 7 |
| CQU | Collaborative Care Referral | Collaborative Care Referral | | 7 | 7 |
| CRM | Clinical study registration message | Clinical study registration message | | 7 | 7 |
| CSU | Unsolicited study data message | Unsolicited study data message | | 7 | 7 |
| EDR | Enhanced display response | Enhanced display response | 2.9 | | |
| DBC | Create Donor Record | Create Donor Record | | 4 | 4 |
| EQQ | Embedded query language query | Embedded query language query | 2.9 | | |
| DBU | Update Donor Record | Update Donor Record | | 4 | 4 |
| ERP | Event replay response | Event replay response | 2.9 | | |
| DEL | Donor Eligibility | Donor Eligibility | | 4 | 4 |
| DEO | Donor Eligibility Observation | Donor Eligibility Observation | | 4 | 4 |
| DER | Donor Eligibility Request | Donor Eligibility Request | | 4 | 4 |
| DFT | Detail financial transactions | Detail financial transactions | | 6 | 6 |
| DOC | Document response | Document response | | 9 - Deprecated | 9 - Deprecated |
| DPR | Donation Procedure | Donation Procedure | | 4 | 4 |
| DRC | Donor Request to Collect | Donor Request to Collect | | 4 | 4 |
| DSR | Display response | Display response | | 5 - Deprecated | 5 - Deprecated |
| MCF | Delayed Acknowledgment (Retained for backward compatibility only) | Delayed Acknowledgment (Retained for backward compatibility only) | 2.9 | | |
| EAC | Automated equipment command message | Automated equipment command message | | 13 | 13 |
| EAN | Automated equipment notification message | Automated equipment notification message | | 13 | 13 |
| EAR | Automated equipment response message | Automated equipment response message | | 13 | 13 |
| EHC | Health Care Invoice | Health Care Invoice | | 16 | 16 |
| ESR | Automated equipment status update acknowledgment message | Automated equipment status update acknowledgment message | | 13 | 13 |
| ESU | Automated equipment status update message | Automated equipment status update message | | 13 | 13 |
| INR | Automated equipment inventory request message | Automated equipment inventory request message | | 13 | 13 |
| INU | Automated equipment inventory update message | Automated equipment inventory update message | | 13 | 13 |
| LSR | Automated equipment log/service request message | Automated equipment log/service request message | | 13 | 13 |
| LSU | Automated equipment log/service update message | Automated equipment log/service update message | | 13 | 13 |
| MDM | Medical document management | Medical document management | | 9 | 9 |
| MFD | Master files delayed application acknowledgment | Master files delayed application acknowledgment | | 8 - Deprecated | 8 - Deprecated |
| MFK | Master files application acknowledgment | Master files application acknowledgment | | 8 | 8 |
| MFN | Master files notification | Master files notification | | 8 | 8 |
| MFQ | Master files query | Master files query | | 8 - Deprecated | 8 - Deprecated |
| MFR | Master files response | Master files response | | 8 - Deprecated | 8 - Deprecated |
| NMD | Application management data message | Application management data message | | 14 | 14 |
| NMQ | Application management query message | Application management query message | | 14 - Deprecated | 14 - Deprecated |
| NMR | Application management response message | Application management response message | | 14 - Deprecated | 14 - Deprecated |
| OMB | Blood product order message | Blood product order message | | 4 | 4 |
| OMD | Dietary order | Dietary order | | 4 | 4 |
| OMG | General clinical order message | General clinical order message | | 4 | 4 |
| OMI | Imaging order | Imaging order | | 4 | 4 |
| ROC | Request clinical information | Request clinical information | 2.9 | | |
| ROD | Request pateint demographics | Request pateint demographics | 2.9 | | |
| OML | Laboratory order message | Laboratory order message | | 4 | 4 |
| OMN | Non-stock requisition order message | Non-stock requisition order message | | 4 | 4 |
| OMP | Pharmacy/treatment order message | Pharmacy/treatment order message | | 4 | 4 |
| OMQ | General order message with document payload | General order message with document payload | | 4 | 4 |
| OMS | Stock requisition order message | Stock requisition order message | | 4 | 4 |
| OPL | Population/Location-Based Laboratory Order Message | Population/Location-Based Laboratory Order Message | | 4 | 4 |
| OPR | Population/Location-Based Laboratory Order Acknowledgment Message | Population/Location-Based Laboratory Order Acknowledgment Message | | 4 | 4 |
| OPU | Unsolicited Population/Location-Based Laboratory Observation Message | Unsolicited Population/Location-Based Laboratory Observation Message | | 7 | 7 |
| ORA | Observation Report Acknowledgment | Observation Report Acknowledgment | | 7 | 7 |
| ORB | Blood product order acknowledgement message | Blood product order acknowledgement message | | 4 | 4 |
| ORD | Dietary order acknowledgment message | Dietary order acknowledgment message | | 4 | 4 |
| ORF | Query for results of observation | Query for results of observation | | 7 - Deprecated | 7 - Deprecated |
| ORG | General clinical order acknowledgment message | General clinical order acknowledgment message | | 4 | 4 |
| ORI | Imaging order acknowledgement message | Imaging order acknowledgement message | | 4 | 4 |
| ORL | Laboratory acknowledgment message (unsolicited) | Laboratory acknowledgment message (unsolicited) | | 7 | 7 |
| ORM | Pharmacy/treatment order message | Pharmacy/treatment order message | | 4 - Deprecated | 4 - Deprecated |
| ORN | Non-stock requisition - General order acknowledgment message | Non-stock requisition - General order acknowledgment message | | 4 | 4 |
| ORP | Pharmacy/treatment order acknowledgment message | Pharmacy/treatment order acknowledgment message | | 4 | 4 |
| ORR | General order response message response to any ORM | General order response message response to any ORM | | 4 - Deprecated | 4 - Deprecated |
| ORS | Stock requisition - Order acknowledgment message | Stock requisition - Order acknowledgment message | | 4 | 4 |
| ORU | Unsolicited transmission of an observation message | Unsolicited transmission of an observation message | | 7 | 7 |
| ORX | General Order Message with Document Payload Acknowledgement | General Order Message with Document Payload Acknowledgement | | 4 | 4 |
| OSM | Specimen Shipment Message | Specimen Shipment Message | | 7 | 7 |
| OSQ | Query response for order status | Query response for order status | | 4 - Deprecated | 4 - Deprecated |
| OSR | Query response for order status | Query response for order status | | 4 - Deprecated | 4 - Deprecated |
| OSU | Order status update | Order status update | | 4 | 4 |
| OUL | Unsolicited laboratory observation message | Unsolicited laboratory observation message | | 7 | 7 |
| PEX | Product experience message | Product experience message | | 7 | 7 |
| PGL | Patient goal message | Patient goal message | | 12 | 12 |
| PIN | Patient insurance information | Patient insurance information | | 11 | 11 |
| PMU | Add personnel record | Add personnel record | | 15 | 15 |
| PPG | Patient pathway message (goal-oriented) | Patient pathway message (goal-oriented) | | 12 | 12 |
| PPP | Patient pathway message (problem-oriented) | Patient pathway message (problem-oriented) | | 12 | 12 |
| PPR | Patient problem message | Patient problem message | | 12 | 12 |
| PPT | Patient pathway goal-oriented response | Patient pathway goal-oriented response | | Deprecated | Deprecated |
| PPV | Patient goal response | Patient goal response | | Deprecated | Deprecated |
| PRR | Patient problem response | Patient problem response | | Deprecated | Deprecated |
| PTR | Patient pathway problem-oriented response | Patient pathway problem-oriented response | | Deprecated | Deprecated |
| QBP | Query by parameter | Query by parameter | | 5 | 5 |
| QCK | Query general acknowledgment | Deferred query | | 5 - Deprecated | 5 - Deprecated |
| QCN | Cancel query | Cancel query | | 5 | 5 |
| QRY | Query, original mode | Query, original mode | | 3 | 3 |
| QSB | Create subscription | Create subscription | | 5 | 5 |
| QSX | Cancel subscription/acknowledge message | Cancel subscription/acknowledge message | | 5 | 5 |
| QVR | Query for previous events | Query for previous events | | 5 | 5 |
| RAR | Pharmacy/treatment administration information | Pharmacy/treatment administration information | | 4 - Deprecated | 4 - Deprecated |
| RAS | Pharmacy/treatment administration message | Pharmacy/treatment administration message | | 4 | 4 |
| RCI | Return clinical information | Return clinical information | | 11 | 11 |
| RCL | Return clinical list | Return clinical list | | 11 | 11 |
| RQQ | Event replay query | Event replay query | 2.9 | | |
| RDE | Pharmacy/treatment encoded order message | Pharmacy/treatment encoded order message | | 4 | 4 |
| RDR | Pharmacy/treatment dispense information | Pharmacy/treatment dispense information | | 4 | 4 |
| RDS | Pharmacy/treatment dispense message | Pharmacy/treatment dispense message | | 4 | 4 |
| RDY | Display based response | Display based response | | 5 | 5 |
| REF | Patient referral | Patient referral | | 11 | 11 |
| RER | Pharmacy/treatment encoded order information | Pharmacy/treatment encoded order information | | 4 - Deprecated | 4 - Deprecated |
| RGR | Pharmacy/treatment dose information | Pharmacy/treatment dose information | | 4 - Deprecated | 4 - Deprecated |
| RGV | Pharmacy/treatment give message | Pharmacy/treatment give message | | 4 | 4 |
| ROR | Pharmacy/treatment order response | Pharmacy/treatment order response | | 4 - Deprecated | 4 - Deprecated |
| SPQ | Stored procedure request | Stored procedure request | 2.9 | | |
| RPA | Return patient authorization | Return patient authorization | | 11 | 11 |
| RPI | Return patient information | Return patient information | | 11 | 11 |
| RPL | Return patient display list | Return patient display list | | 11 | 11 |
| RPR | Return patient list | Return patient list | | 11 | 11 |
| RQA | Request patient authorization | Request patient authorization | | 11 | 11 |
| RQC | Request clinical information | Request clinical information | | 11 | 11 |
| RQI | Request patient information | Request patient information | | 11 | 11 |
| RQP | Request patient demographics | Request patient demographics | | 11 | 11 |
| RRA | Pharmacy/treatment administration acknowledgment message | Pharmacy/treatment administration acknowledgment message | | 4 | 4 |
| RRD | Pharmacy/treatment dispense acknowledgment message | Pharmacy/treatment dispense acknowledgment message | | 4 | 4 |
| RRE | Pharmacy/treatment encoded order acknowledgment message | Pharmacy/treatment encoded order acknowledgment message | | 4 | 4 |
| RRG | Pharmacy/treatment give acknowledgment message | Pharmacy/treatment give acknowledgment message | | 4 | 4 |
| VQQ | Virtual table query | Virtual table query | 2.9 | | |
| RRI | Return referral information | Return referral information | | 11 | 11 |
| RSP | Segment pattern response | Segment pattern response | | 5 | 5 |
| RTB | Tabular response | Tabular response | | 5 | 5 |
| SCN | Notification of Anti-Microbial Device Cycle Data | Notification of Anti-Microbial Device Cycle Data | | 17 | 17 |
| SDN | Notification of Anti-Microbial Device Data | Notification of Anti-Microbial Device Data | | 17 | 17 |
| SDR | Sterilization anti-microbial device data request | Sterilization anti-microbial device data request | | 17 | 17 |
| SET | Specimen Event Tracking | This message type is used to report how the specimen moves through its lifecycle from collection, identification, transport, acceptance or rejection, processing to storage and disposition. | | | |
| SIU | Schedule information unsolicited | Schedule information unsolicited | | 10 | 10 |
| SLN | Notification of New Sterilization Lot | Notification of New Sterilization Lot | | 17 | 17 |
| SLR | Sterilization lot request | Sterilization lot request | | 17 | 17 |
| SMD | Sterilization anti-microbial device cycle data request | Sterilization anti-microbial device cycle data request | | 17 | 17 |
| SQM | Schedule query message | Schedule query message | | 10 - Deprecated | 10 - Deprecated |
| SQR | Schedule query response | Schedule query response | | 10 - Deprecated | 10 - Deprecated |
| SRM | Schedule request message | Schedule request message | | 10 | 10 |
| SRR | Scheduled request response | Scheduled request response | | 10 | 10 |
| SSR | Specimen status request message | Specimen status request message | | 13 | 13 |
| SSU | Specimen status update message | Specimen status update message | | 13 | 13 |
| STC | Notification of Sterilization Configuration | Notification of Sterilization Configuration | | 17 | 17 |
| STI | Sterilization item request | Sterilization item request | | 17 | 17 |
| SUR | Summary product experience report | Summary product experience report | | 7 - Deprecated | 7 - Deprecated |
| TBR | Tabular data response | Tabular data response | | 5 - Deprecated | 5 - Deprecated |
| TCR | Automated equipment test code settings request message | Automated equipment test code settings request message | | 13 | 13 |
| TCU | Automated equipment test code settings update message | Automated equipment test code settings update message | | 13 | 13 |
| UDM | Unsolicited display update message | Unsolicited display update message | | 5 | 5 |
| VXQ | Query for vaccination record | Query for vaccination record | | 4 - Deprecated | 4 - Deprecated |
| VXR | Vaccination record response | Vaccination record response | | 4 - Deprecated | 4 - Deprecated |
| VXU | Unsolicited vaccination record update | Unsolicited vaccination record update | | 4 | 4 |
| VXX | Response for vaccination query with multiple PID matches | Response for vaccination query with multiple PID matches | | 4 -Deprecated | 4 -Deprecated |
