The medical fee reimbursement denied by HIRA(Health Insurance Review Agency) amounted to about 1.2% of the total medical fee claim to HIRA for reimbursement. Most of the denials stem from the inappropriate prescriptions of medical staff violating the medical fee review standards issued by HIRA. Considering the significant impacts of the standards observance behavior on the hospitals' financial viability, we attempted to analyze the predisposition factors of medical staffs' review standards observance behavior. The TPB(Theory of Planned Behavior) was adopted as the theoretical framework of the analysis. Data were collected by administrating a survey on the concepts included in TPB model to the 187 medical staff of a tertiary care hospital. Of the 187 questionaries distributed, 150 were responded resulting 80.2% of response rate. The mean differences among the groups classified by age group, years of experience, medical specialty and gender were analysis using ANOVA. The relationships among the TPB concepts were analysed by applying the Structural Equations Modeling method. The TPB model consists of three exogenous concepts (attitude toward the behavior, subjective norm, and perceived behavioral control) and two endogenous concepts (intention and the behavior). The results of ANOVA indicated significant mean differences among the groups classified by the medical staff's age, years of experience, and medical specialty. The older and the more experienced had the higher mean of observance behavior score. The results of Structural Equations analysis showed that the subjective norm and perceived behavioral control had statistically significant influences on intention, but the influence of attitude to intention was not statistically significant. The influences of perceived behavioral control and intention on behavior were significant. Based on these results the theoretical and practical implications were discussed.