Ischemic optic neuropathy, unspecified eye

This code represents damage to the optic nerve due to insufficient blood supply, leading to sudden, painless vision loss. It specifically refers to cases where the affected eye is not specified in the medical record.

Assign this code when documentation indicates a diagnosis of ischemic optic neuropathy without specifying laterality (e.g., "ischemic optic neuropathy" or "AION"). This code is appropriate when the physician has not identified whether the condition affects the right, left, or both eyes.

• Avoid using this code if laterality is documented; instead, choose a more specific code (H47.011, H47.012, H47.013).
• Ensure the medical record clearly states the diagnosis of ischemic optic neuropathy.
• Query the provider for laterality if it's missing, to allow for more specific coding.