ICD-10 Code G10 – Huntington’s disease (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code G10 – Huntington’s disease
What it is
G10 identifies Huntington’s disease, a hereditary neurodegenerative disorder that causes progressive loss of brain function. It is used when the diagnosis is documented and the condition is the focus of care.
Clinical signs
Typical findings include involuntary choreiform movements, psychiatric or behavioral changes, and gradual cognitive decline. Clinical features vary; refer to documentation.
When to use this code
Use G10 when the provider documents Huntington’s disease, including established or longstanding cases. Code it for encounters addressing the disorder itself, related neurologic decline, or documented manifestations tied to the diagnosis. If the record only notes family history or genetic risk, do not assign G10.
Do not use for
Do not use this code for nonspecific tremor, other movement disorders, or symptoms without a confirmed Huntington’s diagnosis. Check documentation.
Coding tip
Verify that the chart states Huntington’s disease explicitly before assigning G10.