G32.81 Cerebellar ataxia in diseases classified elsewhere

Billable ICD-10-CM code, FY2026. Acts as a Complication or Comorbidity (CC) as a secondary diagnosis.

Excludes1 (never code together)

• systemic atrophy primarily affecting the central nervous system in alcoholic cerebellar ataxia (G31.2)
• systemic atrophy primarily affecting the central nervous system in myxedema (G13.2)

Code first

• underlying disease, such as:
• celiac disease (with gluten ataxia) (K90.0)
• cerebellar ataxia (in) neoplastic disease (paraneoplastic cerebellar degeneration) (C00-D49)
• non-celiac gluten ataxia (M35.9)

Applies from G32.8 Other specified degenerative disorders of nervous system in diseases classified elsewhere

Excludes1 (never code together)

• superior hemorrhagic polioencephalitis [Wernicke's encephalopathy] (E51.2)

Code first

• underlying disease, such as:
• amyloidosis cerebral degeneration (E85.-)
• cerebral degeneration (due to) hypothyroidism (E00.0-E03.9)
• cerebral degeneration (due to) neoplasm (C00-D49)
• cerebral degeneration (due to) vitamin B deficiency, except thiamine (E52-E53.-)

Risk adjustment (HCC)

• CMS-HCC V28: HCC 182 — Spinal Cord Disorders/Injuries
• CMS-HCC V22: HCC 72 — Spinal Cord Disorders/Injuries
• ESRD V24: HCC 72

MS-DRG index

Defines the logic of DRG(s) 058-060 in MDC 01.

Approximate ICD-9-CM (GEMs)

• 334.4 Cerebellar ataxia in diseases classified elsewhere

Medicare Code Edits (MCE v43.1 (April 2026))

• Manifestation codes as principal diagnosis: Manifestation codes describe the manifestation of an underlying disease, not the disease itself, and are not allowed as principal diagnosis.

Code annotations containing back-references to G32.81

Back-references to G32.81

• Use Additional: K90.0 Celiac disease ("gluten ataxia (G32.81)")

Diagnosis Index entries for G32.81

• Ataxia, ataxy, ataxic › cerebellar (hereditary) › in › neoplastic disease
• Ataxia, ataxy, ataxic › cerebellar (hereditary) › in › specified disease NEC
• Ataxia, ataxy, ataxic › gluten
• Ataxia, ataxy, ataxic › gluten › with celiac disease

Nearby codes

• G32 Other degenerative disorders of nervous system in diseases classified elsewhere
• G32.0 Subacute combined degeneration of spinal cord in diseases classified elsewhere
• G32.8 Other specified degenerative disorders of nervous system in diseases classified elsewhere
• G32.81 Cerebellar ataxia in diseases classified elsewhere (this code)
• G32.89 Other specified degenerative disorders of nervous system in diseases classified elsewhere