Lesion of ulnar nerve

This code signifies a pathological process affecting the ulnar nerve, which can manifest as sensory disturbances (numbness, tingling) or motor weakness in the hand and forearm. It encompasses various types of damage, including compression, entrapment, or direct injury to the nerve.

Use this code when documentation indicates a diagnosis of ulnar neuropathy, such as cubital tunnel syndrome, or other specific lesions affecting the ulnar nerve. Supporting documentation should include a physician's diagnosis, neurological exam findings, and potentially nerve conduction studies or electromyography.

• Differentiate from other mononeuropathies of the upper limb; ensure the documentation specifically identifies the ulnar nerve.
• Do not use for generalized polyneuropathies or unspecified nerve disorders.
• Consider an additional E-code if the lesion is due to an external cause (e.g., trauma).