S86.109 - Unspecified injury of other muscle(s) and tendon(s) of posterior muscle group at lower leg level, unspecified leg S86.1 - Injury of other muscle(s) and tendon(s) of posterior muscle group at lower leg level S86.10 - Unspecified injury of other muscle(s) and tendon(s) of posterior muscle group at lower leg level S86.109 - Unspecified injury of other muscle(s) and tendon(s) of posterior muscle group at lower leg level, unspecified leg