This is the CodeSystem that contains codes in both ICD-10 (http://hl7.org/fhir/sid/icd-10) and ICD-10 (http://hl7.org/fhir/sid/icd-10).
This code system http://hl7.org/fhir/comparison/CodeSystem/a51fcf0b-5801-4baf-ad55-a337a1600c4b-990
defines codes, but no codes are represented here