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