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3.2.50 ADT/ACK - change visit number (event A50)

A change has been done at the visit identifier level. That is, a PV1-19-visit number has been found to be incorrect and has been changed.

An A50 event is used to signal a change of an incorrectly assigned visit number value. The "incorrect source visit number" value is stored in the MRG segment (MRG-5-prior visit number) and is to be changed to the "correct target visit number" value stored in the PV1 segment (PV1-19-visit number).

Each superior identifier associated with this visit number identifier level should have the same value in both the PID and MRG segments.

See Section 3.5.2, "Merging patient/person information," for a discussion of issues related to the implementation of change messages.

The fields included when this message is sent should be the fields pertinent to communicate this event. When demographic data in other fields change, it is recommended that the A08 (update patient information) event be used in conjunction with this message. However, all PV1 data associated with the "Visit Number" are treated as updated information.

ADT ADT Message Chapter
MSH  Message Header  2
EVN Event Type  3
PID Patient Identification  3
[PD1] Additional Demographics  3
MRG  Merge Information   3
PV1 Patient Visit  3
ACK General Acknowledgment     Chapter
MSH Message Header        2
MSA Message Acknowledgment      2
[ ERR ] Error          2

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