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H55.0

Non-billable

Nystagmus

H55.0 is the ICD-10-CM code for Nystagmus. It is a non-billable category code — use a more specific child code such as H55.00 for billing.

Status
Header (non-billable)
Chapter
H00-H59
Parent
H55
Subcodes
6
Edition
FY2026

H00-H59 Diseases of the eye and adnexa

What this means — in plain language

MedlinePlus · NIH

When you look at an object, you're using several muscles to move both eyes to focus on it. If you have a problem with the muscles, the eyes don't work properly. There are many kinds of eye movement disorders. Two common ones are: Strabismus - a disorder in which the two eyes don't line up in the same direction. This results in "crossed eyes" or "walleye." Nystagmus - fast, uncontrollable movements of the eyes,…

Read more about Eye Movement Disorders at MedlinePlus ↗

Source: U.S. National Library of Medicine (MedlinePlus). Informational only — not medical advice.

No additional coding notes for this code.

Frequently asked questions

What is ICD-10 code H55.0?
H55.0 is the ICD-10-CM code for "Nystagmus". It falls under H00-H59 Diseases of the eye and adnexa.
Is H55.0 a billable code?
No — H55.0 is a non-billable header code. Use a more specific child code (such as H55.00) for billing.
What are the subcodes of H55.0?
H55.0 has 6 more specific child codes, including H55.00, H55.01, H55.02.

Source: CMS ICD-10-CM FY2026. For informational purposes only — not medical advice. See our medical disclaimer.

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