FAQs: Surgical Site Infections (SSI) Events | NHSN | CDC NOTE: An SSI event must first be identified within the surveillance period following an NHSN operative procedure to review the PATOS question that is found on the SSI event form SSI procedures that are PATOS = YES are not excluded from SSI surveillance
SSI | PSC | NHSN | CDC This guidance document may be used for completing the NHSN procedure details for HPRO – hip arthroplasty and or KPRO – Knee arthroplasty operative procedures
SSI Training | PSC | NHSN | CDC CDC’s National Healthcare Safety Network is the nation’s most widely used healthcare-associated infection tracking system
NHSN SSI Checklist - Centers for Disease Control and Prevention Appendix A found within Chapter 9 Surgical Site Infection [SSI] Event contains a complete list of all NHSN operative procedure categories and the corresponding site-specific SSIs that may be attributable to each category
NHSN Annual Training: Surgical Site Infection 2025 - TN. gov PATOS is a Yes No field on the SSI event form It denotes evidence of infection that was directly seen during the surgical procedure, where an SSI was then attributed Only select PATOS = Yes when it applies to the depth of the SSI that is being attributed to the procedure
Surgical Site Infection (SSI) Event - APIC Infection present at time of surgery (PATOS): PATOS denotes that there is evidence of an infection or abscess at the start of or during the index surgical procedure (in other words, it is present preoperatively)