A change has been done at the alternate visit identifier level. That is, a PV1-50-alternate visit ID has been found to be incorrect and has been changed.
An A51 event is used to signal a change of an incorrectly assigned alternate visit ID value. The "incorrect source alternate visit ID" value is stored in the MRG segment (MRG-6-prior alternate visit ID) and is to be changed to the "correct target alternate visit ID" value stored in the PV1 segment (PV1-50-alternate visit ID).
Each superior identifier associated with this alternate visit 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 only 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 "correct target alternate 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