This is the CodeSystem that contains all the codes in RadLex radiology lexicon (http://radlex.org) and RadLex radiology lexicon (http://radlex.org). E.g. what you have to deal with if you get resources containing codes in either of them
Generated Narrative: CodeSystem a5f384d8-a316-4736-ae90-ae021409e6cf-464
This code system http://hl7.org/fhir/comparison/CodeSystem/a5f384d8-a316-4736-ae90-ae021409e6cf-464 defines codes, but no codes are represented here
http://hl7.org/fhir/comparison/CodeSystem/a5f384d8-a316-4736-ae90-ae021409e6cf-464