G10 — Huntington's disease
Is G10 billable?
Yes — G10 is billable for FY2027. G10 is a valid, billable ICD-10-CM code at the highest level of specificity in its branch. G10 may be submitted for encounters from October 1, 2026 through September 30, 2027.
G10 at a glance
| Code | G10 |
|---|---|
| Description | Huntington's disease |
| Billable | Yes |
| Code set | ICD-10-CM FY2027 |
| Valid for encounters | October 1, 2026 – September 30, 2027 |
Which MS-DRGs does G10 group to?
G10 sits in MDC 01 and helps define the logic of 2 MS-DRGs (version 44, FY2027). Which one a stay actually groups to also depends on procedures and secondary diagnoses.
- 056Degenerative Nervous System Disorders with MCCmedical
- 057Degenerative Nervous System Disorders without MCCmedical
As a secondary diagnosis, G10 is a complication or comorbidity (CC), which can move a stay into a higher-paying DRG.
How is G10 listed in the Alphabetic Index?
These are the routes through the Alphabetic Index that lead to G10. They show the wording a clinician may have documented, which often differs from the Tabular description.
- Huntington's disease or chorea
- Chorea › hereditary (chronic) (gravis) (posthemiplegic) (senile) (spasmodic)
- Chorea › Huntington's (chronic) (gravis) (posthemiplegic) (senile) (spasmodic)
- Disease, diseased › Huntington's
- Huntington's disease or chorea › with dementia
- Chorea › progressive › hereditary (chronic) (gravis) (posthemiplegic) (senile) (spasmodic)
- Dementia › in › Huntington's disease or chorea (degenerative (primary)) (persisting) (unspecified severity) (without behavioral disturbance, psychotic disturbance, mood disturbance, and anxiety)
- 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 (degenerative (primary)) (persisting) (unspecified severity) (without behavioral disturbance, psychotic disturbance, mood disturbance, and anxiety)
Use additional code
Report an additional code alongside G10 to fully describe the condition. G10 is sequenced first.
- 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 wording in documentation that is classified to G10.
- Huntington's chorea
- Huntington's dementia
Excludes2 — not included here — inherited from Chapter 6
The conditions below are not part of G10, but a patient may have both at the same time. When documentation supports it, G10 and the excluded code may both be reported.
- certain conditions originating in the perinatal period (P04-P96)
- certain infectious and parasitic diseases (A00-B99)
- complications of pregnancy, childbirth and the puerperium (O00-O9A)
- congenital malformations, deformations, and chromosomal abnormalities (Q00-Q99)
- endocrine, nutritional and metabolic diseases (E00-E88)
- injury, poisoning and certain other consequences of external causes (S00-T88)
- neoplasms (C00-D49)
- symptoms, signs and abnormal clinical and laboratory findings, not elsewhere classified (R00-R94)
How long has G10 existed?
G10 has been in ICD-10-CM since at least FY2016, the earliest fiscal year on record here.
Derived from the official order files for FY2016–FY2026. FY2017 and FY2020 publish no order file, so those years are not covered.
Which codes are confused with G10?
ICD-10-CM declares these codes mutually exclusive with G10 — exactly one of each pair can be correct for a given encounter.