This is the ValueSet that contains all the codes in Cohort (http://hl7.org/fhir/us/davinci-vbpr/ValueSet/vbp-cohort) and Cohort (http://hl7.org/fhir/us/davinci-vbpr/ValueSet/vbp-cohort). E.g. what you have to deal with if you get resources containing codes in either of them