Lesion of ulnar nerve, bilateral upper limbs

This code signifies a pathological change or injury affecting the ulnar nerve in both the right and left upper extremities. This can manifest as neuropathy, entrapment, or other forms of damage to the nerve, leading to symptoms such as numbness, tingling, weakness, or pain in the areas innervated by the ulnar nerve.

Apply this code when documentation clearly indicates a lesion or dysfunction of the ulnar nerve affecting both arms. This is typically supported by neurological examination findings, nerve conduction studies, electromyography (EMG), or imaging studies confirming bilateral ulnar nerve involvement.

• Ensure documentation specifies bilateral involvement; otherwise, use the appropriate unilateral code (G56.21 or G56.22).
• If the specific cause of the ulnar nerve lesion is known (e.g., cubital tunnel syndrome), code the underlying condition first, followed by this code.
• Distinguish from generalized polyneuropathies; this code is specific to the ulnar nerve.