Cerebellar ataxia with defective DNA repair

This code identifies a rare, inherited neurological disorder characterized by progressive cerebellar ataxia, leading to impaired coordination and balance, combined with a defect in the body's DNA repair mechanisms. Patients often present with symptoms such as gait instability, dysarthria, and oculomotor abnormalities, alongside features related to impaired DNA repair, which can increase cancer risk or sensitivity to radiation.

Assign this code for patients diagnosed with cerebellar ataxia where genetic testing or clinical presentation confirms an underlying defect in DNA repair. This diagnosis is typically made by a neurologist or geneticist based on clinical findings and specific laboratory tests. Documentation should clearly state the presence of both cerebellar ataxia and a confirmed DNA repair defect.

• Differentiate from other forms of hereditary ataxia; the key is the documented DNA repair defect.
• Review "Excludes2" notes carefully to avoid miscoding conditions like Cockayne's syndrome or xeroderma pigmentosum, which have distinct codes.
• Ensure the medical record explicitly links the ataxia to the defective DNA repair mechanism for accurate code assignment.