This is the CodeSystem that contains all the codes in Contact entity type (http://terminology.hl7.org/CodeSystem/contactentity-type) and Contact entity type (http://terminology.hl7.org/CodeSystem/contactentity-type). E.g. what you have to deal with if you get resources containing codes in either of them
Generated Narrative: CodeSystem 818959f7-0f8d-4f6f-b46c-7c5a5833d862-260
This code system http://hl7.org/fhir/comparison/CodeSystem/818959f7-0f8d-4f6f-b46c-7c5a5833d862-260 defines codes, but no codes are represented here