This is the CodeSystem that contains all the codes in QuestionnaireItemUsageMode (http://terminology.hl7.org/CodeSystem/questionnaire-usage-mode) and QuestionnaireItemUsageMode (http://terminology.hl7.org/CodeSystem/questionnaire-usage-mode). E.g. what you have to deal with if you get resources containing codes in either of them
Generated Narrative: CodeSystem d1c8b6ec-a80e-4fac-a75a-4c2360d0fb6d-1424
This code system http://hl7.org/fhir/comparison/CodeSystem/d1c8b6ec-a80e-4fac-a75a-4c2360d0fb6d-1424 defines codes, but no codes are represented here