G11.1 — Early-onset cerebellar ataxia
G11.1 is a non-billable header ICD-10-CM code for early-onset cerebellar ataxia. It cannot be billed on its own: choose one of the more specific child codes below.
Excludes2 inherited from the categories above G11.1
Also inherited, and the opposite of Excludes1: these conditions are not part of G11.1, but a patient can have both, so you may code both.
Other codes that can never be billed with G11.1
These codes carry an Excludes1 note pointing at G11.1. The conflict binds both ways, but ICD-10-CM only writes it down on one side — so you would not find this by reading G11.1 alone.
Risk adjustment
G11.1 does not map to an HCC and does not risk-adjust under CMS-HCC V28. That is normal — most ICD-10 codes do not. It still needs to be coded correctly; it just will not move a RAF score.
Code history
G11.1 has not changed since FY2024 — no addition, revision or deletion across the three most recent ICD-10-CM releases.
Code to one of these instead G11.1
3 child codes. Green means billable.
Related codes at this level
Codes that share G11. If G11.1 is not quite right, the correct code is usually one of these.
- G11.0Congenital nonprogressive ataxia
- G11.2Late-onset cerebellar ataxia
- G11.3Cerebellar ataxia with defective DNA repair
- G11.4Hereditary spastic paraplegia
- G11.5Hypomyelination - hypogonadotropic hypogonadism - hypodontia
- G11.6Leukodystrophy with vanishing white matter disease
- G11.8Other hereditary ataxias
- G11.9Hereditary ataxia, unspecified
Questions about G11.1
- Is G11.1 a billable ICD-10-CM code?
- No. G11.1 is a non-billable header code. Code to a higher level of specificity using one of its child codes.
- Where does G11.1 sit in the tabular list?
- Diseases of the nervous system (G00-G99), in the block Systemic atrophies primarily affecting the central nervous system (G10-G14).