This is the CodeSystem that contains codes in both WHO ATC (http://www.whocc.no/atc) and WHO ATC (http://www.whocc.no/atc).
This code system http://hl7.org/fhir/comparison/CodeSystem/2023f8dc-2ca7-4cc8-b1b8-b801585b8ec6-3432
defines codes, but no codes are represented here