ICD-10 Code H57.051 – Tonic pupil, right eye (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code H57.051 – Tonic pupil, right eye
What it is
H57.051 identifies a tonic pupil affecting the right eye. This means the pupil responds abnormally to light and near focus, usually because of impaired parasympathetic innervation.
Clinical signs
Typical findings include a dilated or poorly reactive right pupil with slow constriction and slow redilation. Clinical features vary; refer to documentation.
When to use this code
Use this code when the record specifically documents tonic pupil in the right eye. It fits unilateral pupillary abnormality noted on exam, consultation, or problem list. If laterality is not stated, check documentation before coding.
Do not use for
Do not use this code for generalized anisocoria, unspecified abnormal pupil reaction, or tonic pupil of the left eye. Check documentation if the note only says “abnormal pupil.”
Coding tip
Always confirm laterality in the ophthalmology or neurology note before assigning H57.051.