ICD-10 Code G11 – Hereditary ataxia (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code G11 – Hereditary ataxia
What it is
G11 identifies hereditary ataxias, a group of inherited disorders that affect coordination and balance. Use it for documented genetic or familial ataxia when the record does not specify a more exact subtype.
Clinical signs
Typical findings include unsteady gait, poor coordination, and difficulty with fine motor control. Clinical features vary; refer to documentation for the specific inherited ataxia pattern.
When to use this code
Use G11 when the provider documents hereditary ataxia, familial ataxia, or a genetic ataxia syndrome without a more specific code. It may also fit when the chart confirms an inherited ataxia but does not name the subtype. Check documentation if the diagnosis is only suspected.
Do not use for
Do not use G11 for acquired ataxia from stroke, intoxication, infection, or injury. If the record names a distinct neurologic disease with its own code, code that condition instead.
Coding tip
Capture the exact inherited subtype when documented, because a more specific code may be available.