S66.402 - Unspecified 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 S66.40 - Unspecified injury of intrinsic muscle, fascia and tendon of thumb at wrist and hand level S66.402 - Unspecified injury of intrinsic muscle, fascia and tendon of left thumb at wrist and hand level