S54.9 - Injury of unspecified nerve at forearm level S54 - Injury of nerves at forearm level S54.9 - Injury of unspecified nerve at forearm level S54.90 - Injury of unspecified nerve at forearm level, unspecified arm S54.91 - Injury of unspecified nerve at forearm level, right arm S54.92 - Injury of unspecified nerve at forearm level, left arm