ICD-10 Code H57.0 – Anomalies of pupillary function (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code H57.0 – Anomalies of pupillary function
What it is
H57.0 identifies abnormal pupillary function, meaning the pupils do not react normally to light, accommodation, or neurologic control. Use it for documented pupillary abnormalities when the exact cause is not specified.
Clinical signs
Clinical features vary; refer to documentation. Findings may include unequal pupils, sluggish or absent light response, or abnormal constriction and dilation noted on eye or neurologic examination.
When to use this code
Use H57.0 when the provider documents an anomaly of pupillary function without naming a more specific diagnosis. It may apply during ophthalmic or neurologic evaluation when the pupil abnormality is the coded finding. Check documentation if the note suggests trauma, drug effect, or a separate eye disorder.
Do not use for
Do not use this code for normal anisocoria without abnormal function, or when a specific underlying cause is documented. If the record identifies another condition explaining the pupil change, code that condition instead.
Coding tip
Query for the exact cause and laterality if the chart only says “abnormal pupils.”