ICD-10 Code G23.0 – Hallervorden-Spatz Disease (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code G23.0 – Hallervorden-Spatz disease
What it is
G23.0 identifies Hallervorden-Spatz disease, also called pantothenate kinase-associated neurodegeneration. It is a rare inherited disorder that causes progressive iron buildup in the brain, especially affecting movement.
Clinical signs
Typical findings include dystonia, rigidity, parkinsonian features, and progressive difficulty with walking or speech. Clinical features vary; refer to documentation.
When to use this code
Use G23.0 when the provider documents Hallervorden-Spatz disease or its accepted equivalent diagnosis. Code it when the record supports a confirmed neurodegenerative disorder with brain iron accumulation, not just nonspecific movement symptoms. Check documentation if the diagnosis is uncertain.
Do not use for
Do not use this code for other extrapyramidal or movement disorders without documentation of Hallervorden-Spatz disease. Do not assign it for suspected disease, family history, or unrelated neurologic symptoms.
Coding tip
Match the exact documented diagnosis, and verify whether the record uses the older eponym or the modern disease name.