ADT^A12 — Cancel Transfer

The A02 transfer should never have happened: A12 retracts it. The patient returns to the previous location; the encounter continues with the same visit number.

Purpose

A12 cancels an erroneous A02: bad data entry, transfer decided then refused by the patient or medically contra-indicated before execution. The patient returns to the previous location without breaking the encounter: no A03 + A01, no rebilling.

Segment structure

Uses the ADT_A09 structure shared with A11 and A13.

PV1 — Patient Visit (revert to origin)

• PV1-3: location the patient returns to (= former PV1-6 of the cancelled A02).
• PV1-6: location the A02 targeted (now cancelled).
• PV1-19: visit number — preserved.

Real-world example

Patient John A. Doe will not be transferred to MED 205 B; he stays in ICU 101 A. A12 emitted at 10:00:

MSH|^~\&|HIS|HOSP01|EHR|CLINIC02|20260515100000||ADT^A12^ADT_A09|MSG00010001|P|2.5.1|||AL|NE
EVN|A12|20260515100000|20260515094530||DRJONES^Jones^Sarah^^^DR.
PID|1||MRN567890^^^HOSP^MR||DOE^JOHN^A^^MR.||19720515|M|||100 MAIN ST^^ANYTOWN^CA^90210^USA||(555)555-1234|||S||ACCT123456|123-45-6789
PV1|1|I|ICU^101^A^HOSP01|EM|||DRSMITH^Smith^James^A^^DR.|||CAR|||1|||DRSMITH^Smith^James^A^^DR.|ADM|||||||||||||||||||HOSP01|||||20260514102530||||||||MED^205^B^HOSP01

Acknowledgment (ACK)

MSH|^~\&|EHR|CLINIC02|HIS|HOSP01|20260515100001||ACK^A12^ACK|ACK00010001|P|2.5.1
MSA|AA|MSG00010001

Common errors

• A12 without preceding A02: invalid. An A12 must always cancel a known A02.
• PV1-3 and PV1-6 swapped: classic trap. Remember PV1-3 = current location after cancellation (= prior origin).
• A12 sent after a subsequent A02: ambiguous for the receiver, who must reconstruct the transfer chain.

Related ADT events

See also: ADT^A02 and ADT^A11.