This is the ValueSet that contains all the codes in eHDSI Illness and Disorder (http://terminology.ehdsi.eu/ValueSet/eHDSIIllnessandDisorder) and eHDSI Illness and Disorder (http://terminology.ehdsi.eu/ValueSet/eHDSIIllnessandDisorder). E.g. what you have to deal with if you get resources containing codes in either of them