ICD-10 G11.10
Billable / Specific HCC v28: 72 CCEarly-onset cerebellar ataxia, unspecified
About ICD-10-CM G11.10
ICD-10-CM code G11.10 represents Early-onset cerebellar ataxia, unspecified. This is a billable/specific code in the Nervous System chapter (block G11). The 2026 edition of ICD-10-CM G11.10 became effective on October 1, 2025.
Coding Tips for G11.10
Specialist guidance from the PayerReady Medical Coding Team. Specificity warnings, HCC capture rules, sequencing notes.
G11.10 is a CMS-HCC v28 risk-adjustment code (category 72). To count for the patient Risk Adjustment Factor (RAF), document the diagnosis with MEAT language each calendar year: Monitored, Evaluated, Assessed, Treated. A diagnosis on the problem list alone does not satisfy CMS RADV audit standards. Include the diagnosis in the assessment with current status and current treatment plan.
G11.10 is designated CC for MS-DRG grouping. On inpatient claims, this code can shift the DRG to the with-CC variant when documented as a present-on-admission secondary diagnosis. Hospital CDI programs flag CC opportunities during chart review. Failure to capture this code may leave 30 to 80 percent of the inpatient stay revenue unrealized.
Medicare Advantage HCC Impact
Capture this diagnosis annually for accurate risk adjustment. Missed HCC captures are the #1 revenue leak in Medicare Advantage risk programs.
Inpatient DRG Impact, CC
codes Early-onset cerebellar ataxia, unspecified. As a Complication/Comorbidity (CC), this contributes to DRG severity adjustment when documented alongside the principal diagnosis.
Medicare LCD Coverage for G11.10
Local Coverage Determinations (LCDs) from CMS MACs that list G11.10 as a covered diagnosis.
Showing top 10 of 531 total . Click a CPT for full coverage scope.
Commercial Payer Coverage
Coverage policies from major commercial payers referencing G11.10.
1 Cigna
5 Medicare
1 Aetna
CPT Codes Commonly Billed with G11.10
Procedures frequently paired with this diagnosis based on PayerReady's Dx↔Px linkage data.
- 29405 CMS LCD: Billing and Coding: Outpatient Physical Therapy CMS LCD
- 95992 CMS LCD: Billing and Coding: Outpatient Physical Therapy CMS LCD
- 29280 CMS LCD: Billing and Coding: Outpatient Physical Therapy CMS LCD
- 97010 CMS LCD: Billing and Coding: Outpatient Physical Therapy CMS LCD
- 29515 CMS LCD: Billing and Coding: Outpatient Physical Therapy CMS LCD
- 97550 CMS LCD: Billing and Coding: Outpatient Physical Therapy CMS LCD
- 97116 CMS LCD: Billing and Coding: Outpatient Physical Therapy CMS LCD
- 97546 CMS LCD: Billing and Coding: Outpatient Physical Therapy CMS LCD
- 29445 CMS LCD: Billing and Coding: Outpatient Physical Therapy CMS LCD
- 29075 CMS LCD: Billing and Coding: Outpatient Physical Therapy CMS LCD
Codes Adjacent To G11.10
Other codes in section G10-G14 (Systemic atrophies primarily affecting the central nervous system).
ICD-10 G11.10, Billing FAQ
Is ICD-10 code G11.10 billable? +
Yes, G11.10 is a billable ICD-10-CM code that can appear as a primary or secondary diagnosis on claims.
Does G11.10 affect Medicare Advantage HCC risk adjustment? +
Yes. G11.10 maps to CMS-HCC v28 category 72. Capture this diagnosis annually for accurate Medicare Advantage risk score.
Is G11.10 a CC or MCC for inpatient DRG? +
Yes, this code is designated as CC. Documenting as a secondary diagnosis on inpatient claims can shift the DRG to a higher-weighted category.
What CPT codes are commonly billed with G11.10? +
Procedures frequently paired with G11.10 include: 29405, 95992, 29280, 97010, 29515.
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Reviewed by the PayerReady Medical Coding Team
Verified against the CMS 2026 code set on May 31, 2026.
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