Chronic kidney disease is acknowledged as one of the most relevant disease for public health. Knowledge of epidemiology of CKD may allow public health interventions both for prevention and treatment in order to limit burden and management costs. Nefrodata is a multicentric, prospective, and observational study conducted in Italy, including patients with CKD followed in a specialist setting. The study uses a web-based data setting; it includes 1263 subjects with an estimate glomerular filtration rate (eGFR) less than 60 ml/min *1,73 sqm, followed in outpatient clinics in Italy. Patients' characteristics analysis evidences that old subjects (mean age of 70.3 13.4 years, 55% of them older than 70 years), with cardiovascular morbidity (50,6%) and diabetics (37%) have a high prevalence. With the reduction of residual renal function, prevalence of hyperphospatemia, metabolic acidosis, use of erythropoiesis-stimulating agents, Vitamin D, and diuretics increases. Also allopurinol and gastric-protective drugs are widely used. Fifty-four and eight % of patients with CKD stage 4 and 65.9% of patients with CKD stage 5 received indication on nutritional therapy.