The aim of this study is to examine the extended model of Theory of Planned Behaviour in predicting tourists' intention in seeking medical tourism in Malaysia. The additional variables in this model are perceived risks, perceived benefits and resource availability whereby it is predicted to have influences to the model of Theory of Planned Behaviour. Sample is drawn using a quota sampling technique. A total of 380 completed questionnaires are collected. The partial least square approach is employed so as to conduct a comprehensive and vigorous structural equation modelling analysis. The results show that perceived benefits and perceived costs are significantly related to attitude; resource availability is significantly related to perceived behavioural control; and attitude and subjective norm are significantly related to intention for medical tourism in Malaysia; however, the perceived behavioural control is found to be insignificant to intention. Attitude and subjective norm are also significantly related to intention for medical tourism in Malaysia. However, the perceived behavioural control is found to be not insignificant related to intention. The findings of this study can serve as the blueprint for future research in the similar area with reasonable modification on the model construction in order to enhance and improve the theoretical extension model of Theory of Planned Behaviour.