Percentage of patients, age 13 and older, undergoing an inpatient surgical procedure who have an outpatient prescription for buprenorphine/naloxone or suboxone in their admissions documentation, who are continued on buprenorphine for the duration of their inpatient stay or undergoing an inpatient or ambulatory surgical procedure who are taking methadone as outpatients or who have a prescription for methadone in their admittance documentation, and where methadone is either continued or changed to an equivalent IV dose to maintain the therapeutic level regimen during the perioperative period. For patients receiving care in an ambulatory surgical setting, methadone medication was provided as scheduled before surgery. This measure will consist of two performance rates: Measure A: Percentage of patients, age 13 and older, undergoing an inpatient surgical procedure who have an outpatient prescription for buprenorphine/naloxone or suboxone in their admissions documentation are continued on buprenorphine for the duration of their inpatient stay. Measure B: Percentage of patients, 13 years and older, undergoing an inpatient or ambulatory surgical procedure who are taking methadone as outpatients or who have a prescription for methadone in their admittance documentation and where methadone is either continued or changed to an equivalent IV dose to maintain the therapeutic level regimen during the perioperative period. For patients receiving care in an ambulatory surgical setting, methadone medication was provided as scheduled before surgery. NOTE: The overall measure score will be calculated as an average of the performance rates of A and B. In order to be scored on this measure, clinicians must have at least one eligible case reported for each sub-metric: Measure A and Measure B.