This is the ValueSet that contains all the codes in Vital Signs Units (http://hl7.org/fhir/ValueSet/ucum-vitals-common) and Performed NotPerformed Planned (http://hl7.org/fhir/us/bfdr/ValueSet/ValueSet-performed-not-performed-planned). E.g. what you have to deal with if you get resources containing codes in either of them