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