In our hospital, the Infection Control Team (ICT) evaluates patients who test positive for the hepatitis virus during preoperative and preadmission tests (the hepatitis virus round), and adds referral requests to a hepatologist to the electronic medical records of these patients. A review after 1 year of this practice confirmed that number of referrals provided by non-hepatology specialty physicians was low, especially among short-stay inpatients. Therefore, we requested referrals using the nudge method in year 2 of the initial infection control training session. This increased the referral consultation rate for short-term hospitalization from 14.3% (3/21) before ICT referral to 31.6% (6/19) in the 1st year and 66.7% (8/12) in the 2nd year (vs. before the start, p<0.01). Thus, the nudge method is effective in promoting voluntary behavior change and can increase rates of referred consultations.