Wrong-site, wrong-procedure, and wrong-patient errors (WSPEs) are serious adverse events. This retrospective analysis of medical liability claims data examined the incidence of WSPEs in France between 2007 and 2017. During this ten-year period, WSPEs accounted for 0.4% of all claims. Procedures on the wrong organ were most common (44%), followed by wrong side (39%), wrong person (13%) and wrong procedure (4%). The researchers found that the average number of WSPEs decreased after implementation of a surgical checklist.