ICD-10-CM G90: Disorders of autonomic nervous system

ICD-10-CM Diagnosis Code (2025)

Official Description for G90

Disorders of autonomic nervous system

Coding Notes & Guidelines for G90

Excludes1: Not Coded Here

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

Excludes1: Not Coded Here

orthostatic hypotension NOS (I95.1)

Excludes1: Not Coded Here
  • causalgia of lower limb (G57.7-)
  • causalgia of upper limb (G56.4-)
  • complex regional pain syndrome II of lower limb (G57.7-)
  • complex regional pain syndrome II of upper limb (G56.4-)
Code First
  • poisoning due to drug or toxin, such as:
  • linezolid (T36.8X- with sixth character 1-4)
  • monoamine oxidase inhibitors (T43.1X with sixth character 1-4)
  • selective serotonin and norepinephrine reuptake inhibitors [SSNRI] (T43.21 with sixth character 1-4)
  • selective serotonin reuptake inhibitors [SSRI] (T43.22 with sixth character 1-4)
Use Additional Code
  • code to identify the cause, such as:
  • fecal impaction (K56.41)
  • pressure ulcer (pressure area) (L89.-)
  • urinary tract infection (N39.0)
Use Additional Code
  • code for adverse effect, if applicable, to identify drug, such as:
  • linezolid (T36.8X5)
  • monoamine oxidase inhibitors (T43.1X5)
  • selective serotonin and norepinephrine reuptake inhibitors [SSNRI] (T43.215)
  • selective serotonin reuptake inhibitors [SSRI] (T43.225)
Use Additional Code
  • code, if applicable, to identify:
  • disseminated intravascular coagulation (D65)
  • hypertensive crisis (I16.-)
  • metabolic acidosis (E87.2-)
  • shock, not elsewhere classified (R57.-)
  • toxic encephalopathy (G92.-)
  • ventricular tachycardia (I47.2-)
Inclusion Terms

Carotid sinus syndrome

Inclusion Terms

Idiopathic peripheral autonomic neuropathy NOS

Inclusion Terms
  • Bernard(-Horner) syndrome
  • Cervical sympathetic dystrophy or paralysis
Inclusion Terms

Neurogenic orthostatic hypotension [Shy-Drager]

Inclusion Terms

Reflex sympathetic dystrophy

Inclusion Terms

Serotonin toxicity

Inclusion Terms
  • Chronic orthostatic intolerance
  • Postural tachycardia syndrome

Child Codes (More Specific Codes for G90):

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

About ICD-10-CM Code G90 (Disorders of autonomic nervous system)

ICD-10-CM code G90 is a billable or specific ICD-10-CM code that can be used to indicate a diagnosis for reimbursement purposes. The 2025 edition of ICD-10-CM G90 became effective on October 1, 2024.

This page provides detailed information about G90 - Disorders of autonomic nervous system. It includes common terminology, coding guidelines such as "Includes," "Excludes1," and "Excludes2" notes, and information on required 7th characters. Utilizing this information correctly is essential for accurate medical coding and claims submission for conditions like Disorders of autonomic nervous system.