G90: Disorders of autonomic nervous system

Codes under G90 (Disorders of autonomic nervous system). A ✓ marks a billable (fully specified) code; category codes without a ✓ are not billable on their own.

Code	Description	Billable
G90.0	Idiopathic peripheral autonomic neuropathy	—
G90.01	Carotid sinus syncope	✓
G90.1	Familial dysautonomia [Riley-Day]	✓
G90.2	Horner's syndrome	✓
G90.3	Multi-system degeneration of the autonomic nervous system	✓
G90.4	Autonomic dysreflexia	✓
G90.5	Complex regional pain syndrome I (CRPS I)	—
G90.8	Other disorders of autonomic nervous system	—
G90.09	Other idiopathic peripheral autonomic neuropathy	✓
G90.9	Disorder of the autonomic nervous system, unspecified	✓
G90.50	Complex regional pain syndrome I, unspecified	✓
G90.51	Complex regional pain syndrome I of upper limb	—
G90.52	Complex regional pain syndrome I of lower limb	—
G90.59	Complex regional pain syndrome I of other specified site	✓
G90.81	Serotonin syndrome	✓
G90.89	Other disorders of autonomic nervous system	✓
G90.511	Complex regional pain syndrome I of right upper limb	✓
G90.512	Complex regional pain syndrome I of left upper limb	✓
G90.513	Complex regional pain syndrome I of upper limb, bilateral	✓
G90.519	Complex regional pain syndrome I of unspecified upper limb	✓
G90.521	Complex regional pain syndrome I of right lower limb	✓
G90.522	Complex regional pain syndrome I of left lower limb	✓
G90.523	Complex regional pain syndrome I of lower limb, bilateral	✓
G90.529	Complex regional pain syndrome I of unspecified lower limb	✓
G90.A	Postural orthostatic tachycardia syndrome [POTS]	✓
G90.B	LMNB1-related autosomal dominant leukodystrophy	✓

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Informational only, not coding or medical advice. Verify against the official ICD-10-CM (FY2026) and your payer's guidelines.

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