As high workload and interruptions are known contributors to diagnostic errors, significant research has been conducted to understand and ameliorate the impact of these factors. This study examined the association between hospitalist busyness (i.e., number of admissions and pages), resource utilization, number of differential diagnoses, and the hospitalist's diagnostic confidence and subjective awareness. Increasing levels of busyness were associated with hospitalists reporting it was "difficult to focus on what is happening in the present" but had no effect on diagnostic confidence.