Toxic optic neuropathy

This code represents damage to the optic nerve caused by exposure to toxic substances, leading to vision impairment. The neuropathy can be acute or chronic, affecting one or both eyes, and may result in decreased visual acuity, color vision deficits, and visual field defects.

Use this code when documentation clearly indicates optic nerve damage is directly attributable to a toxic agent, such as medications (e.g., ethambutol, amiodarone), industrial chemicals, or illicit substances. Supporting documentation should specify the toxic exposure and its causal link to the optic neuropathy.

• Always code the specific toxic agent responsible for the neuropathy using an external cause code (T36-T65) in conjunction with this code.
• Distinguish from other forms of optic neuropathy, such as ischemic (H47.0-) or inflammatory (H46.1-), which have different etiologies.
• Ensure the provider's documentation explicitly states "toxic optic neuropathy" or clearly links a toxic exposure to the optic nerve damage.