Cautery fires during monitored anesthesia care (MAC) increased from 6% of MAC claims during 1985–1989 to 31% of MAC claims during 2000–2009 (P < 0.001 by logistic regression of MAC cautery fires on year). The markers show cautery fires during MAC as a percent of nonfire MAC surgery claims during each year, with the years 2006–2009 combined and indicated at the average year of 2007.5. The line represents the fitted logistic regression curve of cautery fire on year.