2026 ICD-10-CM Diagnosis Code G32.81Cerebellar ataxia in diseases classified elsewhere
ICD-10-CM Codes›G00–G99›G30-G32›G32
- Billable — Valid for Submission
- Chronic Condition
G32.81 is a billable ICD-10-CM diagnosis code for cerebellar ataxia in diseases classified elsewhere. It is valid on HIPAA claims for fiscal year 2026 (October 1, 2025 through September 30, 2026). The code is a manifestation code that cannot be reported as the principal diagnosis. Coders also document this condition as amyotrophic lateral sclerosis plus syndrome. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Other nervous system disorders (often hereditary or degenerative).
Code Identity
Code Classification
Code EditsBilling
Medicare Code Editor checks that affect claim validity for G32.81.
Approximate SynonymsGuidance
Alternate terms and clinical phrases that map to this code.
- Amyotrophic lateral sclerosis plus syndrome
- Amyotrophic lateral sclerosis with spinocerebellar ataxia
- Bird-headed dwarfism with progressive ataxia, insulin-resistant diabetes, goiter, and primary gonadal insufficiency
- Cerebellar ataxia associated with another disorder
- Cerebellar ataxia caused by chemical
- Myelopathy due to nutritional deficiency
- Spinocerebellar ataxia due to vitamin E deficiency
- Substance-induced ataxia
Tabular List NotesGuidance
Coding notes and annotation back-references applicable to this code.
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
Type 1 Excludes
- 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
Certain conditions have both an underlying etiology and multiple body system manifestations due to the underlying etiology. For such conditions, the ICD-10-CM has a coding convention that requires the underlying condition be sequenced first followed by the manifestation. Wherever such a combination exists, there is a "use additional code" note at the etiology code, and a "code first" note at the manifestation code. These instructional notes indicate the proper sequencing order of the codes, etiology followed by manifestation.
A type 1 excludes note is a pure excludes note. It means "NOT CODED HERE!" An Excludes1 note indicates that the code excluded should never be used at the same time as the code above the Excludes1 note. An Excludes1 is used when two conditions cannot occur together, such as a congenital form versus an acquired form of the same condition.
Index to Diseases and InjuriesGuidance
Alphabetical index entries that point to this code.
- Ataxia, ataxy, ataxic - R27.0
- cerebellar (hereditary) - G11.9
- in
- specified disease NEC - G32.81
External Cause of Injuries IndexGuidance
References for this code in the External Cause of Injuries Index.
- Ataxia, ataxy, ataxic
- cerebellar (hereditary)
- in
- specified disease NEC
Clinical ClassificationClinical
AHRQ’s CCSR groups this code into broader clinical categories.
Patient EducationClinical
Cerebellar Disorders
When you play the piano or hit a tennis ball you are activating the cerebellum. The cerebellum is the area of the brain that controls coordination and balance. Problems with the cerebellum include:
Read the full article at MedlinePlus
Courtesy of MedlinePlus, a service of the U.S. National Library of Medicine.
Convert G32.81 to ICD-9-CMHistory
The closest ICD-9-CM equivalents under the General Equivalence Mappings.
Code HistoryHistory
Questions About G32.81Overview
Is G32.81 a billable code?
Yes. This is a billable ICD-10-CM code, specific enough to report cerebellar ataxia in diseases classified elsewhere on HIPAA-covered claims from October 1, 2025 through September 30, 2026.
Can G32.81 be a principal diagnosis?
No. This is a manifestation code: cerebellar ataxia in diseases classified elsewhere describes the manifestation of an underlying disease rather than the disease itself, so the underlying condition is sequenced first.
What is the ICD-9 equivalent of G32.81?
Under the General Equivalence Mappings, cerebellar ataxia in diseases classified elsewhere converts to ICD-9-CM 334.4 (cerebel atax in oth dis). The mapping is a direct match.
Footnotes
[1] Chronic - a chronic condition code indicates a condition lasting 12 months or longer and its effect on the patient based on one or both of the following criteria:
- The condition results in the need for ongoing intervention with medical products,treatment, services, and special equipment
- The condition places limitations on self-care, independent living, and social interactions.
