Union of http://terminology.hl7.org/CodeSystem/FDDC and http://terminology.hl7.org/CodeSystem/FDDC

This is the CodeSystem that contains all the codes in First DataBank Drug Codes (http://terminology.hl7.org/CodeSystem/FDDC) and First DataBank Drug Codes (http://terminology.hl7.org/CodeSystem/FDDC). E.g. what you have to deal with if you get resources containing codes in either of them

CodeSystem

Generated Narrative: CodeSystem 21d0d52d-6932-4516-ad29-944d62abcb69-194

This code system http://hl7.org/fhir/comparison/CodeSystem/21d0d52d-6932-4516-ad29-944d62abcb69-194 defines codes, but no codes are represented here

Code