Background . Modeling of the socio-economic burden of diabetes mellitus type 1 (DM1T) in cohorts of children, adolescents, and adults was performed based on epidemiologic and calculated data for the first time in the local conditions. The specificity of the analysis is the calculation of the direct and indirect costs from social and government positions as well as the creation of the expenditure structure in each cohort of patients. Potential expenditures and their decreasing in patients 5–9 y. o. in case of illness delay have been evaluated on a 5‑year horizon. Objective . The burden of DM1T evaluation in different cohorts divided by age and how it changes in the most sensitive group of patients (aged 5–9 y. o.). Materials and methods Direct medical costs (DMC), indirect medical costs (IMC) and indirect costs (IC) in cohorts of kids (