Foster-Kennedy syndrome, left eye

This code signifies Foster-Kennedy syndrome affecting the left eye. This rare neurological condition is characterized by optic atrophy in one eye (the left in this case) due to direct compression of the optic nerve by an intracranial mass, and papilledema in the contralateral eye (right eye) due to increased intracranial pressure. Anosmia (loss of smell) is also a common associated symptom.

Use this code when documentation clearly indicates Foster-Kennedy syndrome with specific involvement of the left eye. This typically occurs in the presence of a frontal lobe tumor or other intracranial mass causing the described optic nerve compression and increased intracranial pressure. Documentation should specify the laterality of the optic atrophy.

• Always code the underlying intracranial neoplasm or mass first, followed by this code.
• Ensure documentation specifies "left eye" for optic atrophy; if laterality is not specified, query the provider.
• Do not confuse with other causes of unilateral optic atrophy or bilateral papilledema without the specific Foster-Kennedy presentation.