2026 ICD-10-CM Diagnosis Code G90.89Other disorders of autonomic nervous system

ICD-10-CM Codes›G00–G99›G89-G99›G90

ICD-10-CM G90.89
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

G90.89 is a billable ICD-10-CM diagnosis code for other disorders of autonomic nervous system. It is valid on HIPAA claims for fiscal year 2026 (October 1, 2025 through September 30, 2026). In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Other nervous system disorders (neither hereditary nor degenerative).

Code Identity

ICD-10-CM Code
G90.89
Billable Status
Yes — Valid for Submission
Code Describes
Other disorders of autonomic nervous system
Short Description
Other disorders of autonomic nervous system
Same as the full description in the CMS dataset.
Parent Code
G90.8
Other disorders of autonomic nervous system

Code Classification

ChapterG00–G99Diseases of the nervous system
SectionG89-G99Other disorders of the nervous system
CategoryG90Disorders of autonomic nervous system
This CodeG90.89Other disorders of autonomic nervous system

Approximate SynonymsGuidance

Alternate terms and clinical phrases that map to this code.

  • Acute pandysautonomia
  • Autoimmune disorder of autonomic nerve
  • Autoimmune disorder of autonomic nervous system
  • Autoimmune ganglionopathy
  • Autoimmune sensory ganglionopathy
  • Autonomic disorder due to diphtheria
  • Autonomic disorder due to encephalitis
  • Autonomic ganglionopathy
  • Autonomic nervous system disorder co-occurrent and due to neurodegenerative disorder
  • Autonomic nervous system hyperactivity
  • Autonomic neuropathy due to disorder of immune function
  • Autonomic neuropathy due to sodium channelopathy
  • Baroreflex failure syndrome
  • Cold-induced sweating syndrome
  • Disorder of autonomic nervous system caused by drug
  • Disorder of autonomic nervous system due to infectious disease
  • Episodic mydriasis due to parasympathetic insufficiency
  • Episodic mydriasis due to sympathetic hyperactivity
  • Excessive muscarinic activity
  • Hereditary autonomic neuropathy
  • Hypothermia-sweating syndrome
  • Limited autoimmune autonomic neuropathy
  • Segmental autonomic dysfunction
  • Sympathetically maintained pain
  • Syncope due to autonomic failure

Index to Diseases and InjuriesGuidance

Alphabetical index entries that point to this code.

External Cause of Injuries IndexGuidance

References for this code in the External Cause of Injuries Index.

    • Compression
      • nerve
        • sympathetic
    • Compression
      • sympathetic nerve NEC
    • Disorder(of)
      • autonomic nervous system
        • specified NEC
    • Disorder(of)
      • nervous system
        • autonomic (peripheral)
          • specified NEC
    • Imbalance
      • autonomic
    • Imbalance
      • sympathetic
    • Incompetency, incompetent, incompetence
      • chronotropic
        • with
          • autonomic dysfunction
    • Irritable, irritability
      • sympathetic
    • Irritation
      • peripheral autonomic nervous system
    • Irritation
      • sympathetic nerve NEC
    • Paralysis, paralytic(complete) (incomplete)
      • sympathetic
    • Paralysis, paralytic(complete) (incomplete)
      • vasomotor NEC
    • Steinbrocker's syndrome
    • Sympatheticotonia
    • Syndrome
      • hand-shoulder

Clinical ClassificationClinical

AHRQ’s CCSR groups this code into broader clinical categories.

CCSR NVS020
Other nervous system disorders (neither hereditary nor degenerative)
Default principal diagnosis: inpatient Yes · outpatient Yes

Code History & ChangesHistory

Replacement G90.89 replaces the following previously assigned code(s):

  • G90.8 - Other disorders of autonomic nervous system
FY 2025AddedAdded to the ICD-10-CM code setEffective October 1, 2024.
FY 2026CurrentCurrent code set, no changesEffective October 1, 2025 through September 30, 2026.

Questions About G90.89Overview

Is G90.89 (Other disorders of autonomic nervous system) a billable code?

Yes. This is a billable ICD-10-CM code, specific enough to report other disorders of autonomic nervous system on HIPAA-covered claims from October 1, 2025 through September 30, 2026.

Footnotes

[1] Chronic - a chronic condition code indicates a condition lasting 12 months or longer and its effect on the patient based on one or both of the following criteria:

  • The condition results in the need for ongoing intervention with medical products,treatment, services, and special equipment
  • The condition places limitations on self-care, independent living, and social interactions.