Revision of arthrodesis of joint of midfoot, with internal or external fixation by any method, including any of the following (if performed): (a) capsulotomy; (b) joint release; (c) synovectomy; (d) removal of ostephytes at joint; (e) removal of hardware; (f) osteotomy of non-union or malunion; —one joint (H) (Anaes.) (Assist.)