S66.391 - Other injury of extensor muscle, fascia and tendon of left index finger at wrist and hand level S66.3 - Injury of extensor muscle, fascia and tendon of other and unspecified finger at wrist and hand level S66.39 - Other injury of extensor muscle, fascia and tendon of other and unspecified finger at wrist and hand level S66.391 - Other injury of extensor muscle, fascia and tendon of left index finger at wrist and hand level