Answer: Surgeons perform McLaughlin procedures to treat posterior dislocating shoulders. During the operation, the surgeon performs a tendon transfer by moving the subscapularis tendon from its location on the lesser tuberosity into the reverse Hill-Sachs defect.
Sometimes the surgeon performs the McLaughlin as an isolated procedure from an anterior approach. More commonly, however, orthopedists perform the surgery with a posterior capsulorrhaphy through combined anterior (McLaughlin) and posterior (capsulorrhaphy) approaches.
If your surgeon performs the combined approach, you should report both 23395 (Muscle transfer, any type, shoulder or upper arm; single) and 23465 (Capsulorrhaphy, glenohumeral joint, posterior, with or without bone block), with modifier -51 (Multiple procedures) appended.
If the surgeon documents an anterior approach only, you should simply report 23395.