BACKGROUND CONTEXT Recent media coverage and widespread use of overlapping surgery in the medical field have led to several studies investigating public perception of concurrent and overlapping surgery. These studies have revealed a general lack of knowledge about these practices and strong disapproval of their use. PURPOSE To assess patient and family member knowledge about and comfort with concurrent and overlapping surgery. We also sought to determine respondents’ comfort levels with surgical trainee (residents and fellows) participation in their surgery. STUDY DESIGN/SETTING Cross-sectional survey study. PATIENT SAMPLE From June 2019 – August 2019, a research assistant surveyed patients and their family memberswho were waiting to be seen by a surgeon in an academic orthopedic spine surgery clinic. Patients were included if they were 18 years or older, English speaking (or had a translator present), and consented to being surveyed. OUTCOME MEASURES Knowledge of and comfort with concurrent and overlapping surgery, comfort with surgical trainee participation in surgery. METHODS Utilizing a 5-point Likert scale, the 5-part, 36-item survey queried respondents’ comfort level with concurrent and overlapping surgery based on an explanation of these terms by the research assistant conducting the surveys. In addition, respondents were also queried on the following: baseline knowledge of concurrent and overlapping surgery, components of a surgery for which the attending surgeon should be present, and comfort with surgical trainee involvement in an overlapping case. RESULTS Prior knowledge regarding concurrent and overlapping surgery was quite poor in our study population with 8% and 6% of respondents claiming to be familiar with concurrent and overlapping surgery, respectively. Comfort level with overlapping surgery was much greater with overlapping surgery (58%) compared to concurrent surgery (11%) in our study population. Respondents identified the critical period of the surgery as being the most important portion of the case for the attending surgeon to be present (98%), followed by the opening incision (85%) and then the prepping, draping and positioning (75%). About half of respondents felt that the attending surgeon should be present for the entire duration of the surgery (52%). Interestingly, almost all respondents reported that they would like their surgeon to disclose the participation of surgical trainees in their surgery (98%). In addition, the 4th and 5th years of surgical training were associated with a significant increase in patient comfort with surgical trainee participation. CONCLUSIONS Knowledge about concurrent and overlapping surgery remains poor in our study population, a troublesome finding given the widespread practice of the latter. The low comfort level with overlapping surgery indicates the persistence of a strong negative perception toward the idea of surgeons “double-booking” cases. Surgeons who routinely schedule overlapping surgeries may consider implementing patient education efforts with regard to this practice. Lack of general knowledge about overlapping surgery can be a serious impediment to obtaining full informed consent, and further study is required to determine the best methods of improving patient awareness. FDA DEVICE/DRUG STATUS This abstract does not discuss or include any applicable devices or drugs.