ICD-10-CM 2027
ICD-10 code for Huntington's disease
From the official ICD-10-CM alphabetic index entry “Disease, diseased › Huntington's”. Page updated September 29, 2026.
About coding Huntington's disease
The ICD-10-CM code for Huntington's disease is G10 (Huntington's disease). The official index lists 1 more specific code, so check the documentation for details such as type, cause, site or severity before settling on G10.
Use an additional code, if applicable, to identify: dementia with anxiety (F02.84, F02.A4, F02.B4, F02.C4), dementia with behavioral disturbance (F02.81-, F02.A1-, F02.B1-, F02.C1-), dementia with mood disturbance (F02.83, F02.A3, F02.B3, F02.C3), dementia with psychotic disturbance (F02.82, F02.A2, F02.B2, F02.C2), dementia without behavioral disturbance (F02.80, F02.A0, F02.B0, F02.C0) and 1 more.
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 056 (Degenerative Nervous System Disorders with MCC, relative weight 2.2655) and DRG 057 (Degenerative Nervous System Disorders without MCC, relative weight 1.2838), 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.
More specific Huntington's disease codes (official index)
- with dementia G10 — Huntington's disease
Common questions about Huntington's disease ICD-10 codes
What is the ICD-10 code for Huntington's disease?
- G10 — Huntington's disease. More specific codes apply when the documentation supports them: G10.
Is G10 billable?
- Yes. G10 is a billable/specific ICD-10-CM code valid for FY2027 (October 1, 2026 – September 30, 2027).
Can G10 be used as a principal diagnosis?
- Yes. The Medicare Code Editor doesn't restrict G10 as a principal diagnosis.
Is G10 a CC or MCC?
- G10 is a CC (complication or comorbidity) under MS-DRG v44.0, unless excluded by the principal diagnosis.