Appropriate information security measures are very important for today's highly computerized hospitals to maintain the trust from patients. If once the personal information leakage of medical information was occurred, the hospital could lose their trust that has built for long time so far. It is important for hospitals to know the impact of the leakage accident previously advance to decide the investment for information security. The purpose of this study is to evaluate the impact of medical information leakage. The comforting fee for the patient's mental damage as the willingness to accept (WTA) was estimated, when the information leak occurred from a hospital using the contingent valuation method (CVM). Questionnaire survey was conducted using an internet survey service in Japan. We asked for 300 citizens about the use of personal information communication equipment and information security measures and their awareness for the information leakage. In addition, we presented a hypothetical scenario regarding information leakage of own medical information, asked the WTA as the comforting fee by the one choice of acceptance or rejection for the presented fee. In 300 responses, 190 were could be used for WTA estimation. WTA as the comforting fee when the information leakage of medical care information occurred, was estimated 570,541 yen in total. The result was similar with the value estimated by the damage compensation payment estimation model.
Keywords: contingent valuation method; information security; personal information leakage; willingness to acceptance.