G90 is a non-billable/non-specific diagnosis code from the 2026 ICD-10-CM used to classify the following condition: Disorders of autonomic nervous system.
Dysfunction of the autonomic nervous system due to alcohol (G31.2)
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Idiopathic peripheral autonomic neuropathy
Familial dysautonomia [Riley-Day]
Horner's syndrome
Multi-system degeneration of the autonomic nervous system
Autonomic dysreflexia
Complex regional pain syndrome I (CRPS I)
Other disorders of autonomic nervous system
Disorder of the autonomic nervous system, unspecified
Postural orthostatic tachycardia syndrome [POTS]
LMNB1-related autosomal dominant leukodystrophy
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