Union of http://hl7.org/fhir/us/core/ValueSet/us-core-simple-observation-category and http://hl7.org/fhir/ValueSet/observation-category

This is the ValueSet that contains all the codes in US Core Simple Observation Category (http://hl7.org/fhir/us/core/ValueSet/us-core-simple-observation-category) and Observation Category Codes (http://hl7.org/fhir/ValueSet/observation-category). E.g. what you have to deal with if you get resources containing codes in either of them

CodeSystem

Generated Narrative: ValueSet 5fc50c59-6a7f-441e-9c54-465364871bc8-56

This value set includes codes based on the following rules: