S56.401 - Unspecified injury of extensor muscle, fascia and tendon of right index finger at forearm level S56.4 - Injury of extensor muscle, fascia and tendon of other and unspecified finger at forearm level S56.40 - Unspecified injury of extensor muscle, fascia and tendon of other and unspecified finger at forearm level S56.401 - Unspecified injury of extensor muscle, fascia and tendon of right index finger at forearm level