S66.492 - Other specified injury of intrinsic muscle, fascia and tendon of left 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 S66.492 - Other specified injury of intrinsic muscle, fascia and tendon of left thumb at wrist and hand level