---
title: "Common Identifier"
canonical: "https://wiki.patientsknowbest.com/space/api/3764158465/Common%20Identifier"
format: markdown
---
[http://fhir.patientsknowbest.com/id/common-identifier](http://fhir.patientsknowbest.com/id/common-identifier) 

[https://www.hl7.org/fhir/R4/namingsystem.html](https://www.hl7.org/fhir/R4/namingsystem.html) 

## kind

identifier

## description

An extension to represent [[[Appointment.Common ID]]](https://pkbdev.atlassian.net/wiki/spaces/api/pages/3729195048/Entity+Appointment).

## uniqueId

- uniqueId[0]
  - type = uri
  - value = “http://fhir.patientsknowbest.com/id/common-identifier”
  - preferred = true