ICD-10 Code G11.2 – Late-onset cerebellar ataxia (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code G11.2 – Late-onset cerebellar ataxia
What it is
G11.2 identifies late-onset cerebellar ataxia, a disorder marked by progressive coordination problems that begin later in life. It reflects cerebellar dysfunction affecting balance, gait, and fine motor control.
Clinical signs
Typical findings include unsteady walking, limb incoordination, and difficulty with precise movements. Clinical features vary; refer to documentation for onset age, progression, and any associated neurologic findings.
When to use this code
Use G11.2 when the provider documents late-onset cerebellar ataxia or a similar diagnosis of adult-onset cerebellar ataxia. Code it when the record supports a cerebellar ataxia syndrome rather than a nonspecific balance complaint. If the note only says “ataxia,” check documentation for the specific type.
Do not use for
Do not use this code for ataxia caused by intoxication, stroke, or another clearly documented acute condition. Also avoid it when the chart describes a different hereditary or degenerative ataxia; check documentation.
Coding tip
Confirm that the provider links the ataxia to late onset or cerebellar origin before assigning G11.2.