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 a51fcf0b-5801-4baf-ad55-a337a1600c4b-1361
This code system http://hl7.org/fhir/comparison/CodeSystem/a51fcf0b-5801-4baf-ad55-a337a1600c4b-1361
defines codes, but no codes are represented here