This is the CodeSystem that contains all the codes in Contributor Summary Source (http://terminology.hl7.org/CodeSystem/contributor-summary-source) and Contributor Summary Source (http://terminology.hl7.org/CodeSystem/contributor-summary-source). E.g. what you have to deal with if you get resources containing codes in either of them
Generated Narrative: CodeSystem f90bd0a2-fe48-4d1e-ba12-6375efeecd69-290
This code system http://hl7.org/fhir/comparison/CodeSystem/f90bd0a2-fe48-4d1e-ba12-6375efeecd69-290 defines codes, but no codes are represented here