ICD-10 Code H47.142 – Foster-Kennedy syndrome, left eye (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code H47.142 – Foster-Kennedy syndrome, left eye
What it is
H47.142 identifies Foster-Kennedy syndrome affecting the left eye. It describes optic nerve findings associated with a mass effect, typically causing optic atrophy in one eye and swelling in the other.
Clinical signs
Findings may include unilateral optic disc atrophy, contralateral papilledema, and visual field loss. Clinical features vary; refer to documentation.
When to use this code
Use this code when the record specifically documents Foster-Kennedy syndrome involving the left eye. It is appropriate when the clinician links the syndrome to left-sided optic nerve involvement or laterality is clearly stated. Check documentation if the note only mentions optic atrophy or papilledema without the syndrome name.
Do not use for
Do not use this code for isolated optic atrophy, papilledema, or other optic nerve disorders without Foster-Kennedy syndrome. Do not assume laterality if the documentation is nonspecific.
Coding tip
Code the syndrome only when the diagnosis is explicitly documented and laterality is clear.