S54.0 - Injury of ulnar nerve at forearm level S54 - Injury of nerves at forearm level S54.0 - Injury of ulnar nerve at forearm level S54.00 - Injury of ulnar nerve at forearm level, unspecified arm S54.01 - Injury of ulnar nerve at forearm level, right arm S54.02 - Injury of ulnar nerve at forearm level, left arm