Central registry of insured persons (CRIP) is now provided with data from Health insurance companies (HIC) consigned to the guidance notes in batch files and time intervals. However, some incorrectness in data and their processing is caused by relevant legislation which is passed to the methodology of register data exchange and processing,based on current technical and technological means. To remove the incorrectness solution called on-line CRIP was prepared. It is based on communication through web servicesand it brings additional benefits like: simplifying the process on site of health insurance companies; removing multiple batch transmissions; providing immediate confirmation of activities carried out over the trunk of insured persons; having opportunity to address the situation directly with insured person from the branch office; elimination of additional written requests for information given by insured person;etc.