This is the CodeSystem that contains all the codes in Contains Code for UNKNOWN in dicom context (http://fhir.ch/ig/ch-rad-order/CodeSystem/ch-rad-order-dicom-unknown) and Contains Code for UNKNOWN in dicom context (http://fhir.ch/ig/ch-rad-order/CodeSystem/ch-rad-order-dicom-unknown). E.g. what you have to deal with if you get resources containing codes in either of them