S66.419 - Strain of intrinsic muscle, fascia and tendon of unspecified thumb at wrist and hand level S66.4 - Injury of intrinsic muscle, fascia and tendon of thumb at wrist and hand level S66.41 - Strain of intrinsic muscle, fascia and tendon of thumb at wrist and hand level S66.419 - Strain of intrinsic muscle, fascia and tendon of unspecified thumb at wrist and hand level