OBJECTIVES: : Falls/Slips cases injured with over the level two and their medical costs for a year of 2008 at 3 teaching hospitals are explored. METHODS: There are 2559, 1394, and 4086 incident reports in 2008 collected at St. Mary’s Hospital, Shimane University Hospital, and Kyoto University Hospital, Japan. Their reports include 565, 399, and 561 cases for Falls/Slips. The cases are classified 264, 176, and 306 cases with level 2, and 89, 32, and 82 cases with level 3a, and 8, 3, and 5 cases with level 3b, respectively. We explored 963 cases with over level 2 in order to calculate additional medical costs by using their own administrative profiling data. RESULTS: According to the injury level, average AMCs are 108 at SMH, 175 at SUH and, 72 USD at KUH (level 2), respectively. Similarly, Average AMCs are 122, 223, and 97 USD (level 3a), and 1,431, 7,745 and 33,357 USD (level 3b), respectively.With regard to clinical services, AMC with diagnostic imaging is the highest (10,118 USD, SMH; 14,090 USD, SUH), but AMC with surgery/treatment is the highest at KUH, 92,115 USD. AMC with surgery/treatment is 6900 USD at SMH, and 8879 USD at SUH, AMC with iv/div is 1275 USD at SMH and 1818 USD at SUH, AMC with laboratory examination is 674 USD at SMH, and 899 USD at SUH, and AMC with drug administration is 455 USD at SMH and 318 USD at SUH. By contrast, AMCs at KUH are 11578 USD (imaging), 11290 USD (examination), 3372 USD (drug administration), and 714 USD (iv/div), because AMC with level 3b and over is the highest by clinical services. CONCLUSIONS: : Therefore, Hospital administrators and policy makers have to take appropriate measures to prevent patients from Falls/Slips and save money, because this amount is not overlooked.