ICD-10-CM 2027
ICD-10 code for Cerebellaris myoclonica dyssynergia
From the official ICD-10-CM alphabetic index entry “Dyssynergia › cerebellaris myoclonica (Hunt's ataxia)”. Page updated September 29, 2026.
About coding Cerebellaris myoclonica dyssynergia
The ICD-10-CM code for Cerebellaris myoclonica dyssynergia is G11.19 (Other early-onset cerebellar ataxia).
Within G11.1, choose G11.19 (Other early-onset cerebellar ataxia) only when documentation doesn't support a more specific option: unspecified (G11.10) and Friedreich ataxia (G11.11).
As a secondary diagnosis it is a CC (complication or comorbidity), which can move an inpatient stay into the "with CC" MS-DRG of its family, unless the principal diagnosis excludes it.
In MS-DRG v44.0, it is part of the grouping logic for DRG 058 (Multiple Sclerosis and Cerebellar Ataxia with MCC, relative weight 1.8438), DRG 059 (Multiple Sclerosis and Cerebellar Ataxia with CC, relative weight 1.2002) and DRG 060 (Multiple Sclerosis and Cerebellar Ataxia without CC/MCC, relative weight 0.9247), in MDC 01 (Diseases and Disorders of the Nervous System), as a principal or secondary diagnosis. The DRG a claim lands in depends on the principal diagnosis, procedures and any CC/MCC secondary diagnoses.
Common questions about Cerebellaris myoclonica dyssynergia ICD-10 codes
What is the ICD-10 code for Cerebellaris myoclonica dyssynergia?
- G11.19 — Other early-onset cerebellar ataxia.
Is G11.19 billable?
- Yes. G11.19 is a billable/specific ICD-10-CM code valid for FY2027 (October 1, 2026 – September 30, 2027).
Can G11.19 be used as a principal diagnosis?
- Yes. The Medicare Code Editor doesn't restrict G11.19 as a principal diagnosis.
Is G11.19 a CC or MCC?
- G11.19 is a CC (complication or comorbidity) under MS-DRG v44.0, unless excluded by the principal diagnosis.