Optic nerve hypoplasia, left eye

This code signifies a congenital underdevelopment of the optic nerve in the left eye. Optic nerve hypoplasia results in reduced visual acuity and can be associated with other neurological or endocrine abnormalities. The condition is non-progressive and the degree of visual impairment varies depending on the severity of the hypoplasia.

Use this code when documentation clearly indicates a diagnosis of optic nerve hypoplasia affecting the left eye. This diagnosis is typically made by an ophthalmologist based on funduscopic examination revealing a small, pale optic disc. Supporting documentation should include findings from ophthalmic examinations, such as visual acuity tests and imaging studies if performed.

• Ensure laterality is explicitly documented for the left eye; avoid using unspecified laterality codes when the affected eye is known.
• Distinguish from optic atrophy (H47.2x), which is a degeneration of a previously developed optic nerve.
• Code any associated systemic conditions or syndromes (e.g., septo-optic dysplasia) separately.