This is the CodeSystem that contains all the codes in US Public Health CodeSystem - Usage Context Type (http://hl7.org/fhir/us/ph-library/CodeSystem/us-ph-codesystem-usage-context-type) and US Public Health CodeSystem - Usage Context Type (http://hl7.org/fhir/us/ph-library/CodeSystem/us-ph-codesystem-usage-context-type). E.g. what you have to deal with if you get resources containing codes in either of them
Generated Narrative: CodeSystem 52ca7194-343c-4909-957a-337291b688fc-17
This code system http://hl7.org/fhir/comparison/CodeSystem/52ca7194-343c-4909-957a-337291b688fc-17 defines codes, but no codes are represented here