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