CodeSystem 'Ambulance Call Origin'

This code system https://fhir.nhs.uk/R4/CodeSystem/Ambulance-CallOrigin defines the following codes:

CodeDisplay
01999
02NHS 111
03Healthcare Professional
04Police Force
05Telecare Provider/Service
06Other Ambulance Service
07Custodial Service
08Coastguard Service
09Military Service
10Fire Service
11Operational running call
12Event running call
13Mountain Rescue
14Water Rescue
15British Transport Police
98Other Agency (not listed)