ADT_A18
ADT/ACK - Merge Patient Information (Event A18)
7 segments · 1 events
Event A18 has been retained for backward compatibility. The A18 event was used to merge current and previous patient identification numbers: PID-3 - Patient Identifier List, PID-2 - Patient ID, PID-4 - Alternate Patient ID-PID, and PID-18 - Patient Account Number. This procedure is required, for example, when a previous patient is registered under a new patient identification number because of an error, or because there was insufficient time to determine the actual patient identification number. The merge event occurs when a decision is made to combine the information under either the new or the old identifier(s). The PID segment contains the surviving patient ID information. The MRG segment contains the non-surviving information.
From V2.3.1 onwards events A40 (merge patient-patient identifier list), A41 (merge account-patient account number), and A42 (merge visit-visit number) should be utilized in place of the A18 event.
Message Structure
7 segments
R RequiredO Optional Choice
MSH
R1SFT
O*EVN
R1PID
R1PD1
O1MRG
R1PV1
R1Used by Events:A18ADT/ACK - Merge patient information (for backward compatibility only)