3. Validation of morbidity and mortality data Today ICD-10 codes are produced by discharging physicians to summarize diagnoses at discharge and any complications having occurred during patient stay. In order to validate HUH's and Health Trust Førde's ICD-10 coding on patient morbidity and mortality we will randomize inclusion for quality check comparing the ICD-10 codes used at discharge to all actual information on morbidity and mortality as documented in the electronic patient journal (EPJ) - DIPS. This validation should include approximately 700 patients, all having undergone major surgery. Such a comparison is essential to gain knowledge on the quality of generated ICD-10 data and thus important to the quality of results in this study.