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G90.9 ICD-10-CM Code: Disorder of the autonomic nervous system, unspecified

Billing Status: YES. This is a valid, specific, and billable ICD-10-CM reference.

Inpatient Payment Groups (MS-DRG)

MS-DRGs this diagnosis helps define, as principal or secondary, per the CMS ICD-10-CM/PCS MS-DRG Definitions Manual v43.0 (FY2026), Appendix B.

MS-DRG 073 — CRANIAL AND PERIPHERAL NERVE DISORDERS WITH MCC (MDC 01)
MS-DRG 074 — CRANIAL AND PERIPHERAL NERVE DISORDERS WITHOUT MCC (MDC 01)

A diagnosis appearing in a group's logic does not by itself determine the DRG assigned to a stay; the grouper uses the full claim.

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

Official Registry Overview & Definition

Disorder of the autonomic nervous system, unspecified is a billable ICD-10-CM diagnosis code (G90.9).

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)

Nearest Codes in This Family

Official ICD-10-CM classifications closest to G90.9 in its code family, with their registry titles.

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

View all codes in the G90 family

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