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