HL7 Messages

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Health Language 7 is a protocol for sending information between health computing systems. HL7 messages are sent as text through a TCP/IP connection. Each Message consists of several lines, each of which start with a three letter name.

VistA has several HL7 files that specify how messages are transmitted and received:

File Number File Name Description
771 HL7 APPLICATION PARAMETER
771.1 HL7 FIELD
771.2 HL7 MESSAGE TYPE
771.3 HL7 SEGMENT TYPE
771.4 HL7 DATA TYPE
771.5 HL7 VERSION
771.6 HL7 MESSAGE STATUS
771.7 HL7 ERROR MESSAGE
771.8 HL7 STANDARD
771.9 HL7 DEGREE
772 HL7 MESSAGE TEXT
773 HL7 MESSAGE ADMINISTRATION
776 HL7 MONITOR JOB
776.1 HL7 MONITOR
776.2 HL7 MONITOR MASTER JOB
776.3 HL7 MONITOR EVENT TYPE
776.4 HL7 MONITOR EVENT
776.5 HL7 MONITOR EVENTS PROFILE
776.999 HL7 MONITOR PARAMETERS
777 HLO MESSAGE BODY
778 HLO MESSAGES
779.001 HL7 EVENT TYPE CODE
779.002 HL7 ACKNOWLEDGEMENT CODE
779.003 HL7 ACCEPT/APPLICATION ACK CONDITION
779.005 HL7 MESSAGE STRUCTURE CODE
779.1 HLO SYSTEM PARAMETERS
779.11 HLO ERROR SCREENS
779.2 HLO APPLICATION REGISTRY
779.3 HLO PROCESS REGISTRY
779.4 HLO SUBSCRIPTION REGISTRY
779.5 HLO SEGMENT DEFINITIONS
779.9 HLO PRIORITY QUEUES
869.1 HL LOWER LEVEL PROTOCOL TYPE
869.2 HL LOWER LEVEL PROTOCOL PARAMETER
869.3 HL COMMUNICATION SERVER PARAMETERS
870 HL LOGICAL LINK