During the 2010 earthquake response in Haiti, knowledge of the medical encounters through EMR data in the field provided indications of need for patient care. The surveillance of suspected and confirmed condition and diseases of concern allowed for timely decisions on adjustments to the response. Event burden could be quickly assessed through electronic reporting. EMR data can enhance and inform emergency response decision-making during domestic and international events and may be a useful tool for field public health and medical surveillance and situational awareness during future disaster responses. 