Mononeuropathy in diseases classified elsewhere

This code represents a mononeuropathy that arises as a manifestation or complication of another underlying systemic disease. It indicates damage to a single peripheral nerve due to conditions other than those specifically excluded.

Use this code when documentation clearly links a mononeuropathic condition to an underlying systemic disease, such as rheumatoid arthritis, lupus, or sarcoidosis. The primary systemic disease should be coded first, followed by this code to specify the neurological complication.

• Always sequence the underlying systemic disease first, followed by this code.
• Carefully review documentation to ensure the mononeuropathy is explicitly stated as a complication of another classified disease.
• Be mindful of the "Excludes1" notes to avoid incorrect co-coding with diabetic, syphilitic, or tuberculous mononeuropathies.