S66.421 - Laceration 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 S66.42 - Laceration of intrinsic muscle, fascia and tendon of thumb at wrist and hand level S66.421 - Laceration of intrinsic muscle, fascia and tendon of right thumb at wrist and hand level