Primary optic atrophy, left eye

This code signifies the degeneration of the optic nerve due to a primary, non-inflammatory, or non-compressive cause affecting the left eye. It results in impaired visual function and characteristic changes visible during ophthalmoscopy. This condition is distinct from secondary optic atrophy, which arises from an identifiable underlying disease process.

Apply this code when documentation specifies primary optic atrophy affecting the left eye, without an identified underlying cause such as glaucoma, trauma, or inflammation. Supporting documentation should include ophthalmological examination findings noting pallor of the optic disc and visual field defects consistent with optic nerve damage.

• Ensure documentation clearly specifies "primary" optic atrophy and laterality (left eye).
• Distinguish from H47.20 (unspecified optic atrophy) and H47.2X1/H47.2X3 (primary optic atrophy, right/bilateral).
• Do not use if an underlying cause (e.g., glaucoma, tumor, ischemic optic neuropathy) is identified; in such cases, code the underlying condition and the appropriate secondary optic atrophy code.