This is the CodeSystem that contains all the codes in International Classification of Diseases, 10th Revision, Clinical Modification (ICD-10-CM) (http://hl7.org/fhir/sid/icd-10-cm) and International Classification of Diseases, 10th Revision, Clinical Modification (ICD-10-CM) (http://hl7.org/fhir/sid/icd-10-cm). E.g. what you have to deal with if you get resources containing codes in either of them