1. Fetter RB, et al (1980) Case mix definition by diagnosis related groups. Med Care 18(2):1–53 (suppl)
2. Japan Medical Association Research Institute (1999) Report on validity of DRG, Tokyo (in Japanese)
3. Matsuda S (2008) Diagnosis procedure combination: the Japanese approach to casemix. In: Kimberly JR, de Pouvourville G, D’Aunno T (eds) The globalization of managerial innovation in Health care. Cambridge University Press, Cambridge, pp 254–271
4. Yasunaga H, Matsui, Horiguchi H, Fushimi K, Matsuda S (2014) Application of the diagnosis procedure combination (DPC) data to clinical studies. J UOEH 36(3):191–197
5. Ministry of Health, Labour and Welfare (2018) https://www.mhlw.go.jp/stf/shingi/shingi-chuo_128164.html. Accessed 11 Nov 2018