S56.009 - Unspecified injury of flexor muscle, fascia and tendon of unspecified thumb at forearm level S56.0 - Injury of flexor muscle, fascia and tendon of thumb at forearm level S56.00 - Unspecified injury of flexor muscle, fascia and tendon of thumb at forearm level S56.009 - Unspecified injury of flexor muscle, fascia and tendon of unspecified thumb at forearm level