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Our objective was to identify the rate of revisit to either emergency department (ED) or inpatient (IP) following surgical stone removal in the ambulatory setting, and to identify factors predictive of such revisits. To this end, the AHRQ HCUP ambulatory, IP, and ED databases for NY and FL from 2010 to 2014 were linked. Cases were selected by primary CPT for shock-wave lithotripsy (SWL), ureteroscopy (URS), and percutaneous nephrolithotomy (PNL) with accompanying ICD-9 for nephrolithiasis. Cystoscopy (CYS) was selected as a comparison group. The risk of rev