Ischemic optic neuropathy, right eye

This code describes damage to the optic nerve in the right eye due to insufficient blood supply, leading to sudden, painless vision loss. This condition results from an interruption of blood flow to the optic nerve head, causing nerve fiber dysfunction and potential atrophy.

Apply this code when documentation specifies ischemic optic neuropathy affecting the right eye. This diagnosis is typically supported by ophthalmological examination findings, including optic disc edema or pallor, and visual field defects consistent with an ischemic event.

• Ensure laterality is clearly documented as "right eye" to support this specific code.
• Distinguish from other optic neuropathies (e.g., inflammatory, compressive) which have different codes.
• Code any underlying systemic conditions contributing to the ischemia (e.g., giant cell arteritis, diabetes, hypertension) as additional diagnoses.