The EVN segment is used to communicate trigger event information to receiving applications.

EVN Attributes

The fields in the PID segment are as follows:

SEQ LEN DT OPT RP/# ELEMENT NAME
1 3 B Event Type Code
2 26 TS R Recorded Date/Time
3 26 TS O Date/Time Planned Event
4 3 IS O Event Reason Code
5 60 XCN O Y Operator ID
6 26 TS O Event Occurred

*Note: For the complete HL7 Standard, please go to the HL7 organization website.

In pipe and hat format, the PID segment (shown in red) for an ADT-A01 message would look like this:

MSH|^~\&|ADT1|MCM|LABADT|MCM|198808181126|SECURITY|ADT^A01|MSG00001-|P|2.3
EVN|A01|198808181123
PID|||PATID1234^5^M11||JONES^WILLIAM^A^III||19610615|M-||C|1200 N ELM
STREET^^GREENSBORO^NC^27401-1020|GL|(91-9)379-1212|(919)271-
3434||S||PATID12345001^2^M10|123456789|9-87654^NC
NK1|1|JONES^BARBARA^K|WIFE||||||NK
PV1|1|I|2000^2012^01||||004777^LEBAUER^SIDNEY^J.|||SUR||-||ADM|A0-
AL1|1||^Penicillin||Produces hives
AL1|2||^Cat dander|Respiratory distress

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