This is the CodeSystem that contains all the codes in SpecialValues (http://terminology.hl7.org/CodeSystem/special-values) and SpecialValues (http://terminology.hl7.org/CodeSystem/special-values). E.g. what you have to deal with if you get resources containing codes in either of them
Generated Narrative: CodeSystem b601bf88-b57b-4b73-a9a5-705838f4e915-794
This code system http://hl7.org/fhir/comparison/CodeSystem/b601bf88-b57b-4b73-a9a5-705838f4e915-794 defines codes, but no codes are represented here