This is the CodeSystem that contains codes in both FamilyHistoryAbsentReason (http://terminology.hl7.org/CodeSystem/history-absent-reason) and FamilyHistoryAbsentReason (http://terminology.hl7.org/CodeSystem/history-absent-reason).
Generated Narrative: CodeSystem 64cb4fdc-5e7f-4e7b-ba95-487190526cd9-486
This code system http://hl7.org/fhir/comparison/CodeSystem/64cb4fdc-5e7f-4e7b-ba95-487190526cd9-486 defines codes, but no codes are represented here