S56.099 - Other 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 S56.09 - Other injury of flexor muscle, fascia and tendon of thumb at forearm level S56.099 - Other injury of flexor muscle, fascia and tendon of unspecified thumb at forearm level