Injury of ulnar nerve at forearm level, unsp arm, sequela

This code signifies a long-term or late-effect complication resulting from a past injury to the ulnar nerve within the forearm region. It indicates that the specific arm affected (left or right) was not documented or is unknown. These sequelae can manifest as persistent pain, numbness, weakness, or functional impairment in the hand and fingers supplied by the ulnar nerve.

Utilize this code when documenting a patient presenting with residual symptoms or conditions directly attributable to a previous ulnar nerve injury in the forearm, and the laterality of the initial injury is not specified in the medical record. This is appropriate for follow-up encounters addressing chronic issues stemming from the original trauma.

• Always assign an additional code to describe the specific sequela (e.g., muscle weakness, paresthesia).
• Ensure the medical record clearly indicates a past injury and current residual effects, not an acute injury.
• Avoid using this code if the laterality (left or right arm) is known; instead, select the more specific S54.01XS or S54.02XS.