This is the CodeSystem that contains all the codes in Immunization Subpotent Reason (http://terminology.hl7.org/CodeSystem/immunization-subpotent-reason) and Immunization Subpotent Reason (http://terminology.hl7.org/CodeSystem/immunization-subpotent-reason). E.g. what you have to deal with if you get resources containing codes in either of them
Generated Narrative: CodeSystem 64cb4fdc-5e7f-4e7b-ba95-487190526cd9-512
This code system http://hl7.org/fhir/comparison/CodeSystem/64cb4fdc-5e7f-4e7b-ba95-487190526cd9-512 defines codes, but no codes are represented here