The national developmental-behavioral pediatric (DBP) workforce struggles to meet current service demands because of several factors. Lengthy and inefficient documentation processes are likely to contribute to service demand challenges, but DBP documentation patterns have not been sufficiently studied. Identifying clinical practice patterns may inform strategies to address documentation burden in DBP practice. Nearly 500 DBP physicians in the United States use a single commercial electronic health record (EHR) system (EpicCare Ambulatory, Epic Systems Corporation, Verona WI). We evaluated descriptive statistics using the US Epic DBP provider data set. We then compared DBP documentation metrics against those of pediatric primary care and selected pediatric subspecialty providers who provide similar types of care. One-way analyses of variance (ANOVAs) were conducted to determine whether outcomes differed among provider specialties. We identified 4 groups for analysis from November 2019 through February 2020: DBP (n = 483), primary care (n = 76,423), pediatric psychiatry (n = 783), and child neurology (n = 8589). Post hoc pairwise comparisons revealed statistically significant differences between multiple outcome-specialty combinations. Time in notes per appointment and progress note length demonstrated the strongest evidence of an increased burden on DBP providers compared with other similar provider groups. DBP providers spend a significant amount of time documenting progress notes both during and outside of normal clinic hours. This preliminary analysis highlights the utility of using EHR user activity data to quantitatively measure documentation burden.