ICD-10 Code G11.1 – Early-onset cerebellar ataxia (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code G11.1 – Early-onset cerebellar ataxia
What it is
G11.1 identifies early-onset cerebellar ataxia, a disorder marked by impaired coordination from cerebellar dysfunction beginning at a young age. Use it when documentation names this diagnosis specifically.
Clinical signs
Typical findings include gait unsteadiness, limb incoordination, and difficulty with balance or fine motor tasks. Clinical features vary; refer to documentation.
When to use this code
Use G11.1 when the provider documents early-onset cerebellar ataxia as the confirmed diagnosis, including hereditary or idiopathic cases if stated that way. It may also fit follow-up visits for an established condition with persistent coordination problems. If the record only says “ataxia,” check documentation for the type and onset.
Do not use for
Do not use this code for ataxia caused by acute stroke, intoxication, medication effect, or another clearly documented acquired cause. Check documentation when the onset is not early or the cerebellar type is not specified.
Coding tip
Code the condition only when the chart supports both cerebellar involvement and early onset; otherwise, query or use the more specific documented diagnosis.