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

This is the CodeSystem that contains all the codes in AHFS Pharmacologic-Therapeutic Classification (http://terminology.hl7.org/CodeSystem/ahfs) and AHFS Pharmacologic-Therapeutic Classification (http://terminology.hl7.org/CodeSystem/ahfs). E.g. what you have to deal with if you get resources containing codes in either of them

CodeSystem

Generated Narrative: CodeSystem 9374b3b2-0331-4262-a17e-227b06a8f8f3-581

This code system http://hl7.org/fhir/comparison/CodeSystem/9374b3b2-0331-4262-a17e-227b06a8f8f3-581 defines codes, but no codes are represented here

Code