This is the ValueSet that contains all the codes in SDOHCC ValueSet Observation DataAbsentReason (http://hl7.org/fhir/us/sdoh-clinicalcare/ValueSet/SDOHCC-ValueSetObservationDataAbsentReason) and SDOHCC ValueSet Observation DataAbsentReason (http://hl7.org/fhir/us/sdoh-clinicalcare/ValueSet/SDOHCC-ValueSetObservationDataAbsentReason). E.g. what you have to deal with if you get resources containing codes in either of them