---
title: "ADT A27 (Cancel A Pending Admission)"
canonical: "https://wiki.patientsknowbest.com/space/api/3364946987/ADT%20A27%20(Cancel%20A%20Pending%20Admission)"
format: markdown
---
> Macro (toc)
# ADT A27: Cancel Pending Admit
## Overview
This will cancel the pending-admit event associated with this Encounter, if one exists. In addition, it will cancel the corresponding appointment in the patient's calendar that was created when the A14 message was received.
## Relevant Entities
- Encounter information is used to populate[ ](http://www.google.com/url?q=http%3A%2F%2Fdev.patientsknowbest.com%2Fhome%2Fdata-model%23TOC-Encounter&sa=D&sntz=1&usg=AOvVaw2Htu10Sp6-dKBOzPbI0I7l)[[[Encounter]]](https://wiki.patientsknowbest.com/space/api/3744497665/Entity%3A+Encounter) and[ ](http://www.google.com/url?q=http%3A%2F%2Fdev.patientsknowbest.com%2Fhome%2Fdata-model%23TOC-Encounter&sa=D&sntz=1&usg=AOvVaw2Htu10Sp6-dKBOzPbI0I7l)[[[Encounter Event]]](https://wiki.patientsknowbest.com/space/api/3744497665/Entity%3A+Encounter) entities
- Encounter information is also used to create an[ ](http://www.google.com/url?q=http%3A%2F%2Fdev.patientsknowbest.com%2Fhome%2Fdata-model%23TOC-Appointment&sa=D&sntz=1&usg=AOvVaw2b4AZDXyHgNVkc4xPV7Kdv)[[[Appointment]]](https://wiki.patientsknowbest.com/space/api/3729195048/Entity%3A+Appointment)
Please click through to the[ ](http://www.google.com/url?q=http%3A%2F%2Fdev.patientsknowbest.com%2Fhome%2Fdata-model&sa=D&sntz=1&usg=AOvVaw3H4dk1Ql5ZGfvclmnuHM_Y)[Data Model](https://wiki.patientsknowbest.com/space/api/3363700789/Data+Model) to explore the presentation of these entities in the web interface.
Update Behaviour
**[[Encounter]]**
Matched on: [[Encounter.External Encounter ID]] as derived from PV1-19.1
When matched: The [[Encounter Event]] will be handled as indicated below.
When not matched: Since this is a cancellation message, no action will be taken.
**[[Encounter Event]]**
Matched on: An Encounter can contain zero or one pending-admit [[Encounter Event]]s. If the [[Encounter]] has been matched, then there will be at most one pending-admit [[Encounter Event]], so no other IDs are required for matching.
When matched: If there is a pending-admit [[Encounter Event]] associated with this [[Encounter]], it will be deleted.
When not matched: No action.
**[[Appointment]]**
Matched on: PKB maintains an internal link joining the [[Encounter]] to the [[Appointment]]. No additional external IDs required.
When matched: The linked [[Appointment]] will be cancelled.
When not matched: No action.
## Definition
This is identical in format to the [ADT A11](https://wiki.hub.patientsknowbest.com/wiki/spaces/api/pages/3364848631).
## Examples
> MSH|^~\&|SendingApp|SendingFacility|HL7API|PKB|20160102101112||ADT^A27|ABC0000000001|P|2.4
>
> PID|||9999999999^^^NHS^NH||Smith^John^Joe^^Mr||19700101|M|||Flat name^1, The Road^London^London^SW1A 1AA^GBR||01234567890^PRN~07123456789^PRS|^NET^^john.smith@company.com~01234098765^WPN||||||||||||||||N|
>
> PV1|1||||||||||||||||||V00001|
## Response
PKB will respond with a[ ](http://www.google.com/url?q=http%3A%2F%2Fdev.patientsknowbest.com%2Fhome%2Fhl7-api%2Fmessages%2Fack&sa=D&sntz=1&usg=AOvVaw19jl6l0RTsr4epvg_3z1Se)[standard HL7 acknowledgement](https://wiki.hub.patientsknowbest.com/wiki/spaces/api/pages/3364848470).