G90.2: Horner's syndrome
G90.2 is the billable ICD-10-CM diagnosis code for Horner's syndrome. It is a fully specified code, so it can be reported on a claim (subject to clinical documentation and your payer's rules).
Frequently asked questions
What is ICD-10-CM code G90.2?
G90.2 is the ICD-10-CM diagnosis code for Horner's syndrome. It belongs to category G90 (Disorders of autonomic nervous system).
Is G90.2 a billable code?
Yes. G90.2 is a billable, fully specified ICD-10-CM code, so it can be used on a claim (subject to documentation and payer rules).
What category does G90.2 belong to?
G90.2 is part of ICD-10-CM category G90 — Disorders of autonomic nervous system, which has 42 billable codes.
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Informational only, not coding or medical advice. Verify against the official ICD-10-CM (FY2026) and your payer's guidelines.
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