S56.412 - Strain of extensor muscle, fascia and tendon of left index finger at forearm level S56.4 - Injury of extensor muscle, fascia and tendon of other and unspecified finger at forearm level S56.41 - Strain of extensor muscle, fascia and tendon of other and unspecified finger at forearm level S56.412 - Strain of extensor muscle, fascia and tendon of left index finger at forearm level