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