In the present study, we identified all patients who underwent abdominal surgery (for the principal diagnosis of intestinovesical fistula (ICD-9 code ***) to determine the surgical approach, type of resection, risk factors, and complications.
Given the complex nature of the disease, intestinovesical fistula is
Intestinovesical fistula is rare. Literature to date only from case reports and small case series (except one NSQIP series of 500 patients)
A drawback with ACS-NSQIP is that only one ICD code is recorded for each patient, precluding the question of etiology of the fistula. 

Conclusions