This is the CodeSystem that contains all the codes in Identity Identifier Code System (http://hl7.org/fhir/us/identity-matching/CodeSystem/Identity-Identifier-cs) and Identity Identifier Code System (http://hl7.org/fhir/us/identity-matching/CodeSystem/Identity-Identifier-cs). E.g. what you have to deal with if you get resources containing codes in either of them
Generated Narrative: CodeSystem 42d28094-b0a4-4e13-836a-16b07a30471f-2
This code system http://hl7.org/fhir/comparison/CodeSystem/42d28094-b0a4-4e13-836a-16b07a30471f-2
defines codes, but no codes are represented here