S56.02 - Laceration of flexor muscle, fascia and tendon of thumb at forearm level S56.0 - Injury of flexor muscle, fascia and tendon of thumb at forearm level S56.02 - Laceration of flexor muscle, fascia and tendon of thumb at forearm level S56.021 - Laceration of flexor muscle, fascia and tendon of right thumb at forearm level S56.022 - Laceration of flexor muscle, fascia and tendon of left thumb at forearm level S56.029 - Laceration of flexor muscle, fascia and tendon of unspecified thumb at forearm level