This is the ValueSet that contains all the codes in BR Estado Observacao (https://terminologia.saude.gov.br/fhir/ValueSet/BREstadoObservacao) and BR Estado Observacao (https://terminologia.saude.gov.br/fhir/ValueSet/BREstadoObservacao). E.g. what you have to deal with if you get resources containing codes in either of them