There were examined in dynamics 724 patients, in whom complicated diabetic foot syndrome (DFS) was diagnosed, and in 71 (9.8%) of them the disease was complicated by sepsis. The state severity in a DFS patients have depended upon duration of purulent-necrotic process on the foot, in septic patients such dependence was not revealed. All the DFS patients without sepsis were operated on. In total 36 died (lethality 5.5%), in presence of sepsis - 42 (lethality 59.1%). The cause of sepsis in the patients, suffering complicated DFS, was predominantly a wet gangrene of the lower extremities. Among those, who were not operated on, 13 (30.9%) septic patients died, of them 5 – who refused operative intervention performance - died in first hours after admittance to hospital due to irreversible injury of organs and systems.