ADT^A40: Merge patient - patient identifier list

Merges two patient records into one: PID carries the surviving patient's identifiers, and MRG the identifiers being retired. Receivers must move everything filed under the old identifier.

Message type

ADT · ADT message

Trigger event

A40

Message structure

ADT_A39 · per HL7's current table 0354; older versions sometimes paired events differently

In MSH-9

ADT^A40^ADT_A39

Response

ACK · General acknowledgment message

Other events with the ADT_A39 structure

• ADT^A39 Merge person - patient ID
• ADT^A41 Merge account - patient account number
• ADT^A42 Merge visit - visit number

Source: HL7 Terminology (THO) 7.4.0, published by HL7 International under CC0. Check your trading partner's specification for the values they actually send.