ICD-10-CM 2027 diagnosis code

G11Hereditary ataxia

Not billable — use a more specific code

G11 is a header code, so it can't be reported by itself. Choose one of the 9 more specific codes beneath it.

Code unchanged since ICD-10-CM took effect on October 1, 2015. Source: official FY2027 ICD-10-CM release from CDC/NCHS and CMS. Page updated September 29, 2026. About our data

About G11

G11 is the ICD-10-CM diagnosis code for hereditary ataxia. It belongs to block G10-G14 (systemic atrophies primarily affecting the central nervous system) and chapter 6 (diseases of the nervous system). It is a header code, so it can't be reported by itself; one of its 9 subcodes must be used instead.

To report this condition, pick the subcode that matches the documentation: G11.0 (ataxia), G11.1 (ataxia), G11.2 (ataxia), G11.3 (repair), G11.4 (paraplegia), G11.5 (hypodontia), G11.6 (disease), G11.8 (ataxias) and 1 more.

The conditions in its Excludes2 note aren't part of G11, but may be coded alongside it if the patient has both: cerebral palsy (G80.-), hereditary and idiopathic neuropathy (G60.-) and metabolic disorders (E70-E88).

It has been part of ICD-10-CM since the code set took effect on October 1, 2015 and hasn't changed since.

Specific codes under G11

Coding notes

Excludes2Not included here — may be reported together if both conditions exist

cerebral palsy (G80.-)
hereditary and idiopathic neuropathy (G60.-)
metabolic disorders (E70-E88)

Notes that apply from higher levels

Instructions written at a parent level also apply to G11.

Broader instructions also apply from Chapter 6: Diseases of the nervous system.

Codes whose notes reference G11

R26Excludes1
R27Excludes1

Code history

2016
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2021
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2026
2027

FY2016 (effective 10/1/2015): Added (first year of ICD-10-CM)
No changes since FY2016.

Common questions about G11

Is G11 billable?: No. G11 is a header code. Report one of its more specific subcodes instead.