This code system http://terminology.hl7.org.au/CodeSystem/v2-0443 defines the following codes:

CodeDisplayDefinition
WIT WitnessWitness to a procedure or medication administration
 <status value="active"/> <experimental value="false"/> <date value="2023-02-24T08:31:37+11:00"/> <publisher value="HL7 Australia"/> <contact> <name value="HL7 Australia Patient Administration Working Group"/> <telecom> <system value="url"/> <value value="http://confluence.hl7australia.com/display/PA"/> <use value="work"/> </telecom> </contact> <contact> <name value="HL7 Australia Orders and Observations Working Group"/> <telecom> <system value="url"/> <value value="https://confluence.hl7australia.com/display/OO"/> <use value="work"/> </telecom> </contact> <contact> <name value="HL7 Australia Medications Working Group"/> <telecom> <system value="url"/> <value value="https://confluence.hl7australia.com/display/MED"/> <use value="work"/> </telecom> </contact> <description value="Additional concept codes for specifying the functional involvement with the activity being transmitted (e.g., Case Manager, Evaluator, Transcriber, Nurse Care Practitioner, Midwife, Physician Assistant, etc.) defined for use in an Australian context. These codes are used as extensions to the HL7 International code set."/> <jurisdiction> <coding> <system value="urn:iso:std:iso:3166"/> <code value="AU"/> </coding> </jurisdiction> <copyright value="HL7 Australia© 2018+; Licensed Under Creative Commons No Rights Reserved."/> <caseSensitive value="true"/> <compositional value="false"/> <versionNeeded value="true"/> <content value="complete"/> <concept> <code value="WIT"/> <display value="Witness"/> <definition value="Witness to a procedure or medication administration"/> </concept> </CodeSystem>