Peer comparison has potential as an effective antimicrobial stewardship intervention in the inpatient setting. We report a new metric, days of therapy per 100 service days, for comparing antibiotic utilization. Among 14 prescribers on the primary infectious diseases service during a 6-month period, we identified 1 outlier for each anti-MRSA agent. Infect Control Hosp Epidemiol 2017;38:1506-1508.