This is the CodeSystem that contains all the codes in US Core Category (http://hl7.org/fhir/us/core/CodeSystem/us-core-category) and US Core Category (http://hl7.org/fhir/us/core/CodeSystem/us-core-category). E.g. what you have to deal with if you get resources containing codes in either of them
Generated Narrative: CodeSystem f7f60f4d-3aa1-42c0-bfd0-68d94d09e1b5-8
This code system http://hl7.org/fhir/comparison/CodeSystem/f7f60f4d-3aa1-42c0-bfd0-68d94d09e1b5-8
defines codes, but no codes are represented here