S56.421 - Laceration 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 S56.42 - Laceration of extensor muscle, fascia and tendon of other and unspecified finger at forearm level S56.421 - Laceration of extensor muscle, fascia and tendon of right index finger at forearm level