Lesion of ulnar nerve, right upper limb

This code signifies damage or abnormality affecting the ulnar nerve specifically in the right upper extremity. This can manifest as sensory disturbances (e.g., numbness, tingling in the fourth and fifth fingers), motor weakness (e.g., difficulty with fine motor skills, grip strength), or pain along the nerve's distribution.

Apply this code when documentation clearly indicates a lesion, entrapment, or other pathology of the ulnar nerve on the patient's right side. This includes conditions like cubital tunnel syndrome, ulnar neuropathy due to trauma, or other compressive neuropathies affecting the right ulnar nerve. Supporting documentation should specify the laterality and the nature of the nerve involvement.

• Ensure documentation specifies "right upper limb" to differentiate from left or bilateral involvement.
• Distinguish between a lesion (G56.2-) and mononeuropathy (G56.8-) or polyneuropathy (G60-G64) affecting the ulnar nerve.
• Code any underlying cause of the lesion (e.g., fracture, dislocation) as an additional diagnosis, following sequencing guidelines.