G90

Classification

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Coding Guidance

G90 should not be used for reimbursement purposes as there are more specific codes below it that contain a greater level of detail.

Excludes 1

G31.2

dysfunction of the autonomic nervous system due to alcohol

Excludes 2

More Specific Codes

G90.0

Idiopathic peripheral autonomic neuropathy

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

G90.9

Disorder of the autonomic nervous system, unspecified

G90.A

Postural orthostatic tachycardia syndrome [POTS]

G90.B

External Resources

2025 ICD-10 guidelines from CMS.gov