This is the ValueSet that contains all the codes in DiagnosisICD9CM (http://terminology.hl7.org/ValueSet/v3-DiagnosisICD9CM) and DiagnosisICD9CM (http://terminology.hl7.org/ValueSet/v3-DiagnosisICD9CM). E.g. what you have to deal with if you get resources containing codes in either of them