This is the CodeSystem that contains all the codes in PHD Observation Categories Code System (http://hl7.org/fhir/uv/phd/CodeSystem/PhdObservationCategories) and PHD Observation Categories Code System (http://hl7.org/fhir/uv/phd/CodeSystem/PhdObservationCategories). E.g. what you have to deal with if you get resources containing codes in either of them
Generated Narrative: CodeSystem 9f191729-d025-40c5-b6e7-19a19f27df4f-5
This code system http://hl7.org/fhir/comparison/CodeSystem/9f191729-d025-40c5-b6e7-19a19f27df4f-5
defines codes, but no codes are represented here