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