G11.9 Hereditary ataxia, unspecified
The ICD-10-CM code for Hereditary ataxia, unspecified is G11.9 (FY2026). It is a billable, claim-ready diagnosis code.
Classification
- Section
- G10-G14: Systemic atrophies primarily affecting the central nervous system (G10-G14)
- Category G11
- 13 codes (11 billable)
- FY2026 Status
- Stable since FY2024
Also Known As
ICD-10-CM Alphabetic Index entries that lead to G11.9:
- Ataxia, ataxy, ataxic › cerebral (hereditary)
- Disease, diseased › spinocerebellar (hereditary)
- Ataxia, ataxy, ataxic › cerebellar (hereditary)
- Ataxia, ataxy, ataxic › hereditary
- Ataxia, ataxy, ataxic › brain (hereditary)
- Paralysis, paralytic (complete) (incomplete) › ataxic (hereditary)
- Sclerosis, sclerotic › hereditary › cerebellar
- Degeneration, degenerative › cerebellar NOS › primary (hereditary) (sporadic)
Inclusion Terms
- Hereditary cerebellar ataxia NOS
- Hereditary cerebellar degeneration
- Hereditary cerebellar disease
- Hereditary cerebellar syndrome
U.S. Hospital Utilization
- An estimated 5,980 U.S. inpatient stays in 2023 included G11.9 among the documented diagnoses.
- 560 stays listed it as the principal diagnosis.
Source: National Inpatient Sample (NIS), Healthcare Cost and Utilization Project (HCUP), Agency for Healthcare Research and Quality, 2016–2023. National survey-weighted estimates.
Official Coding Guidelines
Dominant/nondominant side (TOC entry)a. Dominant/nondominant side ................................................................................................. 45
Pain - Category G89 (TOC entry)b. Pain - Category G89.............................................................................................................. 45
Source: CMS — ICD-10-CM Official Guidelines for Coding and Reporting, FY2026