What is HL7?

Event Codes

A message is a collection of data that sends information about an event in a healthcare enterprise.

Some examples of Event Codes and their corresponding message types are listed below:

Event Code Description
ADT^A01 Admit Patient
ADT^A02 Transfer
ADT^A03 Discharge
ADT^A11 Cancel Admit
ADT^A17 Swap Patients
ORM^O01 Order Message
ORR^O02 Order Response
OMD^O03 Diet Order
SIU^S12 Notification of new appointment
SIU^S13 Notification of appointment rescheduling
SIU^SIU Notification of appointment cancellation

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