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 974a4042-5ef9-4d87-bcaa-92de671fa085-770
This code system http://hl7.org/fhir/comparison/CodeSystem/974a4042-5ef9-4d87-bcaa-92de671fa085-770 defines codes, but no codes are represented here