G90.9 Disorder of the autonomic nervous system, unspecified

Billable ICD-10-CM code, FY2026.

Applies from G90 Disorders of autonomic nervous system

Excludes1 (never code together)

• dysfunction of the autonomic nervous system due to alcohol (G31.2)

MS-DRG index

Defines the logic of DRG(s) 073-074 in MDC 01.

Approximate ICD-9-CM (GEMs)

• 337.9 Unspecified disorder of autonomic nervous system (approximate)

Diagnosis Index entries for G90.9

• Degeneration, degenerative › nervous system › autonomic
• Disease, diseased › nervous system › autonomic
• Disease, diseased › nervous system › parasympathetic
• Disease, diseased › nervous system › sympathetic
• Disease, diseased › nervous system › vegetative
• Disease, diseased › peripheral › autonomic nervous system
• Disease, diseased › sympathetic nervous system
• Disorder (of) › autonomic nervous system
• Disorder (of) › nerve › sympathetic
• Disorder (of) › nervous system › autonomic (peripheral)
• Disorder (of) › nervous system › parasympathetic
• Disorder (of) › nervous system › sympathetic
• Disorder (of) › nervous system › vegetative
• Disturbance (s) › sympathetic (nerve)
• Neuropathy, neuropathic › peripheral (nerve) › autonomic

Nearby codes

• G90.529 Complex regional pain syndrome I of unspecified lower limb
• G90.59 Complex regional pain syndrome I of other specified site
• G90.8 Other disorders of autonomic nervous system
• G90.81 Serotonin syndrome
• G90.89 Other disorders of autonomic nervous system
• G90.9 Disorder of the autonomic nervous system, unspecified (this code)
• G90.A Postural orthostatic tachycardia syndrome [POTS]
• G90.B LMNB1-related autosomal dominant leukodystrophy