Original clinical classification of a complicated diabetic foot syndrome (DFS), based on summarizing of experience, concerning surgical treatment of 1532 patients, suffering complicated DFS, was proposed, necessitating determination of clinical form (symbol C), anatomic localization (symbol Z) and etiological factor (symbol E) of the lower extremity tissues affection. The classification applied permits to choose a surgical tactics depending on presence of specific complication of DFS, and this creates conditions for unification and universal registration of form and severity of a complicated DFS, as well as the volume of a surgical aid