Is G10 a billable ICD-10-CM code?

Yes. G10 is a billable, specific ICD-10-CM code and is valid for submission on a claim.

Where does G10 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).

G10

G10 — Huntington's disease

Billable / specific codeICD-10-CM

G10 is a billable, specific ICD-10-CM code for huntington's disease. It is valid for submission on a claim.

Use additional code

Add a secondary code to capture the detail described below.

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)
mild neurocognitive disorder due to known physiological condition (F06.7-)

Inclusion terms

Alternative wordings a physician may use in the chart for this same code.

Huntington's chorea
Huntington's dementia

Other codes that can never be billed with G10

These codes carry an Excludes1 note pointing at G10. The conflict binds both ways, but ICD-10-CM only writes it down on one side — so you would not find this by reading G10 alone.

G21Secondary parkinsonism
G25.5Other chorea
I02Rheumatic chorea

Risk adjustment

G10 risk-adjusts. Under the CMS-HCC V28 model it maps to this category:

HCC 200 Friedreich and Other Hereditary Ataxias; Huntington Disease0.279 RAF

Coefficient shown for the Community Non-dual Aged segment. A higher HCC in the same hierarchy will suppress this one, so capturing it does not always add score.

Medicare coverage

G10 is named in 13 Medicare coverage policies — 13 listing it as supporting medical necessity. Which of them applies to you depends on your Medicare contractor, and coverage genuinely differs by state.

A54111Billing and Coding: Speech Language Pathology (SLP) Services: Communication Disorders
A56612Billing and Coding: CT of the Head
A56773Billing and Coding: Neurophysiology Evoked Potentials (NEPs)
A56868Billing and Coding: Outpatient Speech Language Pathology

How G10 is indexed

Coders do not find codes by browsing the tabular list — they look them up in the alphabetic index, under the word the physician wrote. These are the index entries that lead here, so you can see which chart wordings map to G10.

Huntington's disease or chorea
Chorea›hereditary
Chorea›Huntington's
Disease, diseased›Huntington's
Huntington's disease or chorea›with dementia
Chorea›progressive›hereditary
Dementia›in›Huntington's disease or chorea
Disease, diseased›Huntington's›with dementia
Huntington's disease or chorea›with dementia›with behavioral disturbance
Dementia›in›Huntington's disease or chorea›with behavioral disturbance

Questions about G10

Is G10 a billable ICD-10-CM code?: Yes. G10 is a billable, specific ICD-10-CM code and is valid for submission on a claim.
Where does G10 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).