This is the CodeSystem that contains all the codes in Modifier type Codes (http://terminology.hl7.org/CodeSystem/modifiers) and Modifier type Codes (http://terminology.hl7.org/CodeSystem/modifiers). E.g. what you have to deal with if you get resources containing codes in either of them
Generated Narrative: CodeSystem 4c05a9f5-c5c6-415b-bc13-3335b255c8a0-617
This code system http://hl7.org/fhir/comparison/CodeSystem/4c05a9f5-c5c6-415b-bc13-3335b255c8a0-617 defines codes, but no codes are represented here