Coloboma of optic disc, left eye

This code describes a congenital malformation of the optic disc in the left eye, characterized by a notch or defect in the optic nerve head. This defect results from incomplete closure of the embryonic fissure during ocular development, potentially affecting vision.

Assign this code when documentation specifies a coloboma affecting the optic disc of the patient's left eye. This diagnosis is typically made during an ophthalmologic examination, often in infancy or early childhood, and may be associated with other ocular or systemic anomalies.

• Ensure the documentation clearly specifies "optic disc" and "left eye" to support this laterality-specific code.
• Distinguish from coloboma of other ocular structures (e.g., iris, choroid, retina), which have different codes.
• Code any associated visual impairment or other ocular anomalies separately, if documented.