Reducing the incidence of surgical site infections (SSIs) is one of the objectives of the national program to combat nosocomial infections (NI). Since 1999, interregional surveillance of SSIs has been coordinated by the Network for Alert, Investigation, and Surveillance of Nosocomial Infections (Raisin). Each year, participating surgical departments collect data from a list of "priority" specialties regarding the patient or procedure, including components of the NNIS risk index. All included patients must be followed up through the 30th postoperative day. SSI cases are defined according to standard criteria. In 2013, participation in the surveillance of priority procedures decreased: 928 surgical departments (106,220 procedures). However, the average number of procedures monitored per department increased significantly. The breakdown by specialty was as follows: general surgery (295 departments; 30.1%), obstetrics and gynecology (285 departments; 23.4%), vascular surgery (116 departments; 6.9%), urology (118 departments; 5.6%), orthopedics (276 departments; 24.3%), trauma surgery (108 departments; 6.2%), and neurosurgery (63 departments; 3.5%). The incidence ranged from 0.53% for vascular surgery to 2.82% for urology (including 3.96% for prostatectomies). As noted in previous years, the slowing of the decline in incidence is confirmed, but in 2013, an increase was observed for breast surgery, abdominal wall hernias, and hip replacements (total and partial). These increases are not always confirmed by multivariate analyses that exclude “outlier” departments. It would be interesting, in the future, to evaluate other risk factors that could explain variations in the incidence of ISO.