ICD-10 Code H57.00 – Unspecified anomaly of pupillary function (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code H57.00 – Unspecified anomaly of pupillary function
What it is
This code identifies an abnormality of pupil function when the specific type is not documented. Use it for pupillary problems that affect size, response, or symmetry without a more precise diagnosis.
Clinical signs
Clinical features vary; refer to documentation. Common findings may include abnormal pupil reactivity, unequal pupils, or an atypical response to light or accommodation.
When to use this code
Use H57.00 when the record states an unspecified pupillary dysfunction and does not name a cause or subtype. It fits situations where the provider documents an abnormal pupil exam but leaves the diagnosis broad. If laterality, etiology, or a specific neurologic or ocular disorder is identified, check documentation for a more precise code.
Do not use for
Do not use this code when the chart clearly identifies anisocoria, mydriasis, miosis, or another defined pupillary disorder. Also avoid it if the abnormal pupil finding is documented as part of a separate confirmed condition.
Coding tip
Query the provider for the exact pupillary abnormality before defaulting to an unspecified code.