National trends and economic impact of surgical treatment for benign kidney tumors.

•The estimated annual total hospital charge for inpatient renal surgery has increased from $1.3 billion to $2.2 billion during the study period.•During the study period, 8.5% of inpatient renal surgical admissions were performed for benign masses.•Benign renal neoplasm surgery accounted for 14.8% (3,935) of partial and 5.5% (3,153) of radical nephrectomies.