Transfer of major tendon of foot and ankle, including: (a) split or whole transfer to contralateral side of foot; and (b) passage of posterior or anterior tendon to, or through, interosseous membrane; and (c) any of the following (if performed): (i) synovial biopsy; (ii) synovectomy; (iii) tendon lengthening; (iv) insetting of tendon (H) (Anaes.) (Assist.)