Rheumatoid arthritis is a chronic inflammatory rheumatic disease. The goals of treatment and rehabilitation are weight reduction, prevention of damage and deformity, and continuation of work and personal activities. Spas, sanatoriums, rehabilitation centers and special hospitals are an excellent choice for the rehabilitation of patients suffering from rheumatoid arthritis because they offer hydrotherapy/balneotherapy, individual or group exercises, electrostimulation, galvanic, interference and diadynamic currents, laser, magnetotherapy, hydrokinesitherapy, underwater massage, four-cell baths, paraffin therapy, IC lamp, occupational therapy, etc. The application of these methods of physical therapy has a positive effect and the outcome of rehabilitation is very good. The main goal of this research is to compare the outcome of rehabilitation in patients with rheumatoid arthritis based on the secondary use of health data. Secondary processing of data from the Integrated Hospital Information System (IBIS) in the Topusko Hospital was carried out. Data analysis covers a period of 3 years. Patients with said diagnosis were undergoing inpatient rehabilitation at the Spa in the period from 01.01.2019 to 01.01.2022 and were included in the data analysis. The obtained results of this research show that the outcome of rehabilitation in most patients is improved. It was also concluded that the outcome of rehabilitation is more successful in women than in men and that the outcome isn't more successful in patients over 65 years of age. A comparison of the number of rehabilitated men and women was made, and it can be seen that a greater number of women were rehabilitated compared to the number of men. It is observed that the majority of rehabilitated patients are over 65 years old. Considering the results of rehabilitation of all patients within 3 years, it is concluded that 91.11% of patients improved their quality of life after rehabilitation. The specific goal of the research is the evaluation of the hospital information system IBIS, where certain advantages and disadvantages of the system are presented