Surgery of acromioclavicular joint or sternoclavicular joint, by arthroscopic means, including any of the following (if performed): (a) cartilage treatment; (b) removal of loose bodies; (c) synovectomy; (d) excision of joint osteophytes; other than a service associated with a service to which another item in this Group applies that is performed on the same joint by arthroscopic means (H) (Anaes.) (Assist.)