Congenital blood coagulation factor disorder medical treatment research project, set by the Ministry of Health, Labour and Welfare, is the system to cover the copayment of the patients with specified disease to study hemophilia treatment. Through this system, 10,000 yen is paid toward the copayment balance of the medical cost of the patients over 20 years old with hemophilia. Patients will receive their congenital blood coagulation factor disorder beneficiary card, which will be issued on application. Submission of the certificate for the specified disease treatment is required to use this system.