---
title: "ADT A11 (Cancel An Admission)"
canonical: "https://wiki.patientsknowbest.com/space/api/3364848631/ADT%20A11%20(Cancel%20An%20Admission)"
format: markdown
---
> Macro (toc)
# ADT A11: Cancel An Admission
## Overview
This will cancel the admission event associated with this Encounter, if one exists. Note that if there are other (non-admission) Encounter Events associated with this Encounter, then the Encounter will not be removed, i.e. it will continue to exist but without an admission Encounter Event.
## 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
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 admission [[Encounter Event]]s. If the [[Encounter]] has been matched, then there will be at most one admit [[Encounter Event]], so no other IDs are required for matching.
When matched: If there is an admission [[Encounter Event]] associated with this [[Encounter]], it will be deleted.
When not matched: No action.
## Definition
| **Segment** | **Field** | **Opt** | **RP/#** | **Component** | **Description** | **Example** | **Data Model** |
| --- | --- | --- | --- | --- | --- | --- | --- |
| **MSH** | | | | | Message header. This conforms to PKB's [standard definition](https://wiki.hub.patientsknowbest.com/wiki/spaces/api/pages/3365012972). | | |
| **PID** | | | | | Patient identification. This conforms to PKB's [standard definition](https://wiki.hub.patientsknowbest.com/wiki/spaces/api/pages/3364849216). | | |
| **PV1** | | | | | Patient visit information. | | |
| | PV1-19 | **R** | | | Visit ID. This is used by PKB to uniquely identify an Encounter. | | [[Encounter.External Encounter ID]] |
| | | | | PV1-19.1 | Visit ID | V00001 | |
## Examples
> MSH|^~\&|SendingApp|SendingFacility|HL7API|PKB|20160102101112||ADT^A11|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).