ICD-10 Code G90.89 – Other disorders of autonomic nervous system (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code G90.89 – Other disorders of autonomic nervous system
What it is
This code identifies autonomic nervous system disorders that do not fit a more specific ICD-10-CM category. Use it for documented autonomic dysfunction affecting involuntary body functions when the record is nonspecific.
Clinical signs
Clinical features vary; refer to documentation. You may see abnormal heart rate, blood pressure, sweating, or other autonomic symptoms, but the diagnosis should be supported by the provider’s stated disorder.
When to use this code
Use G90.89 when the clinician documents a disorder of the autonomic nervous system and no more specific code applies. It is appropriate for nonspecific autonomic neuropathy or dysautonomia when the chart does not identify a better-defined condition.
Check documentation if the record names a known underlying cause or a more specific autonomic diagnosis. Code the documented condition instead of defaulting to this residual category.
Do not use for
Do not use this code for conditions with a more specific autonomic diagnosis already documented. Avoid it when the chart only mentions symptoms without a confirmed autonomic disorder.
Coding tip
Code the exact provider-documented autonomic disorder first, and use G90.89 only when the documentation supports a nonspecific “other” autonomic nervous system disorder.