This is the CodeSystem that contains all the codes in CodeSystem message events (https://www.ehealth.fgov.be/standards/fhir/mycarenet/CodeSystem/message-events) and CodeSystem message events (https://www.ehealth.fgov.be/standards/fhir/mycarenet/CodeSystem/message-events). E.g. what you have to deal with if you get resources containing codes in either of them
Generated Narrative: CodeSystem 99456e0b-6080-4f00-a343-74f1e0c1dcbf-20
This code system http://hl7.org/fhir/comparison/CodeSystem/99456e0b-6080-4f00-a343-74f1e0c1dcbf-20 defines codes, but no codes are represented here