Background: Maintenance of Certification (MOC) is a controversial topic in medicine for many different reasons.Studies have suggested that there may be associations between fewer negative outcomes and participation in MOC. However, MOC still remains controversial because of its cost. We sought to determine the estimated cost of MOC to the average orthopaedic surgeon, including fees and time cost, defined as the market value of the physician's time. Methods: We calculated the total cost of MOC to be the sum of the fees required for applications, examinations, and other miscellaneous fees as well as the time cost to the physician and staff. Costs were calculated for the oral, written, and American Board of Orthopaedic Surgery Web-based Longitudinal Assessment (ABOS WLA) MOC pathways based on the responses of 33 orthopaedic surgeons to a survey sent to a state orthopaedic society. Results: We calculated the average orthopaedic surgeon's total cost in time and fees over the decade-long period to be $71,440.