ICD-10 Code G11.8 – Other hereditary ataxias (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code G11.8 – Other hereditary ataxias
What it is
G11.8 identifies inherited ataxias that do not fit a more specific hereditary ataxia category. Use it for genetic or familial coordination disorders when the record supports a hereditary cause but the exact subtype is not named.
Clinical signs
Typical findings include progressive gait unsteadiness, poor coordination, limb ataxia, and sometimes dysarthria. Clinical features vary; refer to documentation for the specific inherited pattern and associated neurologic signs.
When to use this code
Use this code when the clinician documents a hereditary ataxia, familial ataxia, or inherited cerebellar disorder without a more specific diagnosis. It also fits when the chart confirms genetic ataxia but does not name the subtype. Check documentation if the cause is acquired, toxic, or otherwise nonhereditary.
Do not use for
Do not use G11.8 for ataxia from stroke, alcohol, medication, infection, or other acquired causes. If the record names a more specific hereditary ataxia, code that diagnosis instead.
Coding tip
Look for wording such as “familial,” “genetic,” or “hereditary” before assigning G11.8.