The incidence of diabetes mellitus complications was assessed on the basis of diabetes mellitus register in 1478 diabetics living in the Lenin district of Moscow. The incidence of microangiopathies was reliably higher in patients with insulin-dependent condition (IDDM) than in those with the non-insulin dependent (NIDDM) one. The incidence of retinopathies and nephropathies was much higher in women with IDDM than in men. The incidence of macroangioptithies was higher in NIDDM than in those with IDDM. The incidence of coronary disease and arterial hypertension was the highest in women with NIDDM. The incidence of complications increased with a longer standing of the disease and age of the patients.