This is the CodeSystem that contains all the codes in C4BB Identifier Type Code System (http://hl7.org/fhir/us/carin-bb/CodeSystem/C4BBIdentifierType) and C4BB Identifier Type Code System (http://hl7.org/fhir/us/carin-bb/CodeSystem/C4BBIdentifierType). E.g. what you have to deal with if you get resources containing codes in either of them
Generated Narrative: CodeSystem e3b48bb5-f595-464c-a9d8-b1089850b601-20
This code system http://hl7.org/fhir/comparison/CodeSystem/e3b48bb5-f595-464c-a9d8-b1089850b601-20
defines codes, but no codes are represented here