S66.491 - Other specified injury of intrinsic muscle, fascia and tendon of right thumb at wrist and hand level S66.4 - Injury of intrinsic muscle, fascia and tendon of thumb at wrist and hand level S66.49 - Other specified injury of intrinsic muscle, fascia and tendon of thumb at wrist and hand level S66.491 - Other specified injury of intrinsic muscle, fascia and tendon of right thumb at wrist and hand level