ICD-10 Code G90.8 – Other disorders of autonomic nervous system (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code G90.8 – Other disorders of autonomic nervous system
What it is
G90.8 identifies autonomic nervous system disorders that do not fit a more specific ICD-10 category. Use it when documentation names an autonomic disorder, but the record does not support a narrower code.
Clinical signs
Clinical features vary; refer to documentation. Autonomic dysfunction may involve abnormal control of heart rate, blood pressure, sweating, digestion, or bladder function, but the specific pattern should be clearly described in the chart.
When to use this code
Use G90.8 when the provider documents an autonomic nervous system disorder and no more specific diagnosis is available. It also fits cases where the condition is described as “other” or atypical autonomic dysfunction. If the record supports a named autonomic syndrome, code that diagnosis instead.
Do not use for
Do not use this code for a more specific autonomic disorder that has its own ICD-10 code. Check documentation if the note instead describes a neurologic, cardiovascular, or endocrine condition without clear autonomic involvement.
Coding tip
Code G90.8 only after confirming the provider’s wording does not support a more specific autonomic diagnosis.