The objective of the Mortality Forum and the Mortality Reference Group (MRG) is to improve international comparability of mortality data by establishing standardized application of the International Classification of Diseases, 10th edition (ICD-10). Problems are solved in the forum, or fed into specialist discussions at the WHO-FIC Network Mortality Reference Group (MRG), resulting in standardized application of mortality coding rules and guidelines by making decisions regarding the interpretation of rules and guidelines for mortality, and deliberating on updates to the classification and the rules and guidelines.