ICD-10 Code H55 – Nystagmus and other irregular eye movements (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code H55 – Nystagmus and other irregular eye movements
What it is
H55 identifies nystagmus and other abnormal, involuntary eye movements. Use it for documented irregular ocular motion that is not better classified by a more specific diagnosis.
Clinical signs
Typical findings include rhythmic or jerking eye movements, often noted on exam or reported as oscillopsia. Clinical features vary; refer to documentation.
When to use this code
Use H55 when the record clearly documents nystagmus or another irregular eye movement as the diagnosis. It may also fit when the provider describes abnormal ocular motion without a more specific code available. Check documentation for laterality, type, or underlying cause if stated.
Do not use for
Do not use H55 for transient eye movements that are not diagnosed as nystagmus or for symptoms alone without a documented condition. If the chart supports a more specific neurologic, vestibular, or ocular disorder, code that condition instead.
Coding tip
Look for the provider’s exact wording and any stated cause, because specificity can change code selection.