G90.9 is the authoritative medical code for Disorder of the autonomic nervous system, unspecified. This classification is used in medical billing and clinical recording to specify the clinical criteria for disorder of the autonomic nervous system, unspecified (ICD-10-CM G90.9), ensuring healthcare documentation aligns with 2026 federal coding standards.
Billing Status: YES. This is a valid, specific, and billable ICD-10-CM reference.
Official Registry Overview & Definition
Disorder of the autonomic nervous system, unspecified is a billable ICD-10-CM diagnosis code G90.9. Excludes1 (not coded here): dysfunction of the autonomic nervous system due to alcohol G31.2.
Official Tabular Instructional Notes
Sequencing, inclusion, and exclusion notes published for G90.9 in the official ICD-10-CM tabular list.
Excludes1 — Not Coded Here
Conditions that can never be reported with this code; the two are mutually exclusive.
- dysfunction of the autonomic nervous system due to alcohol G31.2
Frequently Asked Questions (FAQ) & Clinical Guidance
What can't be coded together with G90.9?
Per Excludes1 instructions, G90.9 must not be reported with: dysfunction of the autonomic nervous system due to alcohol (G31.2).
Codes in This Family (26)
Official ICD-10-CM classifications in the same code family as G90.9, with their registry titles.
- G90 — Disorders of autonomic nervous system
- G90.0 — Idiopathic peripheral autonomic neuropathy
- G90.01 — Carotid sinus syncope
- G90.09 — Other 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)
- G90.50 — Complex regional pain syndrome I, unspecified
- G90.51 — Complex regional pain syndrome I of upper limb
- 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
- G90.52 — Complex regional pain syndrome I of lower 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
- G90.59 — 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.A — Postural orthostatic tachycardia syndrome [POTS]
- G90.B — LMNB1-related autosomal dominant leukodystrophy
Indexed Clinical Terms (15)
Clinical term phrases from the official ICD-10-CM Index to Diseases and Injuries that map to this code.
- 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
Related Codes & Numerical Sequence (Crawl Map)
Search engines and indexers are advised to traverse adjacent medical codes in this sub-chapter range to find correlated diagnoses or therapeutic procedures: