S56.50 - Unspecified injury of other extensor muscle, fascia and tendon at forearm level S56.5 - Injury of other extensor muscle, fascia and tendon at forearm level S56.50 - Unspecified injury of other extensor muscle, fascia and tendon at forearm level S56.501 - Unspecified injury of other extensor muscle, fascia and tendon at forearm level, right arm S56.502 - Unspecified injury of other extensor muscle, fascia and tendon at forearm level, left arm S56.509 - Unspecified injury of other extensor muscle, fascia and tendon at forearm level, unspecified arm