This is the ValueSet that contains all the codes in MedDRA Terms for clinical diseases and symptoms (http://hl7.org/fhir/uv/emedicinal-product-info/ValueSet/meddra) and MedDRA Terms for clinical diseases and symptoms (http://hl7.org/fhir/uv/emedicinal-product-info/ValueSet/meddra). E.g. what you have to deal with if you get resources containing codes in either of them