This is the CodeSystem that contains all the codes in Modifier type Codes (http://terminology.hl7.org/CodeSystem/modifiers) and Modifier type Codes (http://terminology.hl7.org/CodeSystem/modifiers). E.g. what you have to deal with if you get resources containing codes in either of them
Generated Narrative: CodeSystem 9e51d01c-2171-44b3-bbfd-16a67ff06a3d-617
This code system http://hl7.org/fhir/comparison/CodeSystem/9e51d01c-2171-44b3-bbfd-16a67ff06a3d-617 defines codes, but no codes are represented here