OBJECTIVES: To determine whether the Social Security Institution of Turkey has an appropriate system to collect and process data in order to conduct budget impact analysis. METHODS: A literature review was conducted in order to specify the data needed for budget impact studies. Then, interviews with the personnel of the Monitoring and Evaluation Department and Pharmaceuticals and Pharmacy Department in the Social Security Institution were made. Besides, the literature concerning General Health Insurance MEDULA system was reviewed. Data was assessed in terms of its existence and accessibility. RESULTS: After using Web Electronic Bill System (w-ELF) in 2006, MEDULA was established in order to transfer data between health care settings and general health insurance system in 2007 in Turkey. Currently, patient characteristics such as age and gender, information regarding diagnosis, examination, consultation, analysis, operation, complications and pharmaceuticals and medical supplies used can be recorded via MEDULA. However, patients and number of patients who have a specific health condition or who use a certain pharmaceutical product cannot be determined via web services of the system. Similarly, costs paid for a specific medical treatment cannot be identified via MEDULA. On the other hand, it is indicated that there is a project to determine number of patients who have a specific health condition through the system. CONCLUSIONS: Although there is relevant raw data, number of eligible people with a specific indication, extent of implementation of a pharmaceutical and incremental cost per patient which are necessary for budget impact studies cannot be accessed through the existent system in the Social Security Institution of Turkey. Thus, some improvement in data processing is needed.