This is the ValueSet that contains all the codes in Tipo Identificador (https://interoperabilidad.minsal.cl/fhir/ig/nid/ValueSet/VSTipoIdentificador) and Tipo Identificador (https://interoperabilidad.minsal.cl/fhir/ig/nid/ValueSet/VSTipoIdentificador). E.g. what you have to deal with if you get resources containing codes in either of them