G90 — Disorders of autonomic nervous system

Billing Status: NO. This is a clinician non-billable / parent hierarchy grouping in the ICD-10-CM system.

Code Set: Valid FY2026 and FY2027. FY2026 took effect October 1, 2025.

Official Registry Overview & Definition

Disorders of autonomic nervous system is a non-billable ICD-10-CM category code (G90). A more specific billable subcode must be selected for claims submission.

Official Tabular Instructional Notes

Sequencing, inclusion, and exclusion notes published for G90 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

Can G90 be billed directly?

No. G90 (Disorders of autonomic nervous system) is a non-billable ICD-10-CM category code. A more specific billable subcode must be selected based on clinical documentation.

Nearest Codes in This Family

Official ICD-10-CM classifications closest to G90 in its code family, with their registry titles.

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
G90.9 — Disorder of the autonomic nervous system, unspecified
G90.A — Postural orthostatic tachycardia syndrome [POTS]
G90.B — LMNB1-related autosomal dominant leukodystrophy