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

This is the CodeSystem that contains all the codes in HL7 Registered External Coding Systems (http://terminology.hl7.org/CodeSystem/externalCodeSystems) and HL7 Registered External Coding Systems (http://terminology.hl7.org/CodeSystem/externalCodeSystems). E.g. what you have to deal with if you get resources containing codes in either of them

CodeSystem

Generated Narrative: CodeSystem a51fcf0b-5801-4baf-ad55-a337a1600c4b-893

This code system http://hl7.org/fhir/comparison/CodeSystem/a51fcf0b-5801-4baf-ad55-a337a1600c4b-893 defines codes, but no codes are represented here

Code