ICD-10 Code H52.31 – Anisometropia (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code H52.31 – Anisometropia
What it is
Anisometropia means the two eyes have different refractive power. You use this code when the chart documents unequal vision correction needs between the eyes.
Clinical signs
Patients may report blurred vision, eyestrain, headaches, or reduced binocular comfort. Clinical features vary; refer to documentation.
When to use this code
Use H52.31 when the provider documents anisometropia as the diagnosis, such as during an eye exam or refractive assessment. It may appear with unequal myopia, hyperopia, or astigmatism between eyes. Confirm the record distinguishes this from amblyopia or other ocular disorders.
Do not use for
Do not use this code for routine refractive error without unequal findings, or for amblyopia alone. Check documentation if the note describes another eye condition as the primary problem.
Coding tip
Code anisometropia only when the clinician explicitly documents unequal refraction between the eyes.