ADT^A50 — Change Visit Number
Change of Visit Number (PV1-19) without changing patient. Typical case: renumbering on year rollover, or correction of an admission keying error.
Purpose
A50 renames a visit. The patient stays the same, only the Visit Number changes. Typical cases: numbering scheme change (year rollover), correction of an admission keying error. All clinical resources attached to the visit must be updated with the new Visit Number.
Segment structure
Structure ADT_A50. MSH, EVN, PID, PV1 (new Visit Number in PV1-19),
MRG (old Visit Number in MRG-7).
Real-world example
Renumbering of VN20251231009 to VN20260518050 (year rollover):
MSH|^~\&|EHR|HOSP01|LIS|CLINIC02|20260518180000||ADT^A50^ADT_A50|MSG00050001|P|2.5.1|||AL|NE
EVN|A50|20260518180000|||ADM004^Manager^VisitNo^^^MS.|RE-NUMBER VISIT - YEAR ROLLOVER
PID|1||MR100900^^^HOSP^MR||SCHMIDT^KARL^^^MR.||19610305|M
PV1|1|I|MED^405^B|||||DR_FISCHER^Fischer^Hans||||||||||||VN20260518050
MRG||||||||VN20251231009Acknowledgment (ACK)
MSH|^~\&|LIS|CLINIC02|EHR|HOSP01|20260518180001||ACK^A50^ACK|ACK00050001|P|2.5.1
MSA|AA|MSG00050001Common errors
- Confusion with A45: A45 moves a visit to another patient, A50 renames a visit on the same patient.
- MRG-7 missing: the receiver does not know which Visit Number to replace.
- No propagation to Observations: every resource must be updated.
Related ADT events
| Code | Trigger event | Description |
|---|---|---|
| A50 | Change Visit Number | This page. |
| A45 | Move Visit Information | Move to another patient. |
| A47 | Change Patient Identifier List | Patient identifier level. |
| A51 | Change Alternate Visit ID | Alternate level. |