ADT^A27 — Cancel Pending Admit

A14 emitted, but the admission will no longer take place: A27 frees the bed, signals the receiving service and the pharmacy to stop preparing for this patient.

Purpose

Typical cases: patient no-show, postponed intervention, hospitalisation deemed unnecessary after pre-admission reassessment. A27 must be sent as soon as the cancellation decision is taken — otherwise the bed stays reserved needlessly, impacting the available capacity shown to bed-management tools.

Segment structure

Structure ADT_A27: MSH, EVN, PID, PV1.

Real-world example

Patient Claire Martin (A14 of 16 May) does not show on 20 — A27 sent on 19:

MSH|^~\&|HIS|HOSP01|EHR|CLINIC02|20260519080000||ADT^A27^ADT_A27|MSG00027001|P|2.5.1|||AL|NE
EVN|A27|20260519080000|||DRJONES^Jones^Sarah^^^DR.|PATIENT NO-SHOW
PID|1||MRN789012^^^HOSP^MR||MARTIN^CLAIRE^^^MS.||19850214|F
PV1|1|P|MED^305^A^HOSP01|R|||DRBROWN^Brown^Henry^^^DR.|||MED|||1|||DRBROWN|ADM|||||||||||||||||||HOSP01|||||20260520140000

Acknowledgment (ACK)

MSH|^~\&|EHR|CLINIC02|HIS|HOSP01|20260519080001||ACK^A27^ACK|ACK00027001|P|2.5.1
MSA|AA|MSG00027001

Common errors

• A27 sent after A01: too late — use A11 (Cancel Admit) instead, which cancels a firm admission.
• Bed not freed on bed management: ensure the module receives A27 (often a separate subscription from A01-A08).
• EVN-4 missing: no-show vs reschedule vs medical cancellation — each needs different follow-up (statistics, patient reminders).

Related ADT events

See also: ADT^A14, ADT^A11.