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    v1.0.28
    OpenPayerBilling CodesOther disorders of the nervous systemICD-10-CM g90-disorders-of-autonomic-nervous-system
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    ICD-10-CM Code For Disorders Of Autonomic Nervous System: Group Overview

    The International Classification of Diseases, Tenth Revision, Clinical Modification (ICD-10-CM) code group G90 includes disorders of the autonomic nervous system such as autonomic neuropathy, dysautonomia, and other specified autonomic dysfunctions that affect involuntary physiological processes. These ICD-10-CM diagnosis codes are used to document clinical scenarios involving impaired autonomic regulation, multisystem involvement, or progressive autonomic failure that impact patient management. Accurate coding within the ICD-10-CM G90 group supports proper claim adjudication, complete clinical documentation, and appropriate reimbursement.

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    ICD-10-CM G90: Disorders Of Autonomic Nervous System Overview

    The ICD-10-CM G90 group covers disorders of the autonomic nervous system, including conditions that impair involuntary bodily functions such as heart rate, blood pressure, digestion, and sweating. These diagnoses involve dysfunction of sympathetic, parasympathetic, or combined autonomic control and can be primary or secondary to other diseases. Accurate coding matters because it supports appropriate clinical documentation and reimbursement for services related to autonomic testing and management.

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    When to Use

    Use a code from this group when clinical documentation indicates autonomic nervous system dysfunction such as orthostatic intolerance, abnormal heart rate regulation, or gastrointestinal dysmotility attributable to autonomic failure. Select the specific code that reflects the documented subtype, laterality if applicable, and any underlying secondary cause noted in the medical record.

    ICD-10-CM Codes

    21 rows

    ICD-10-CM CodeDescription
    G90.01Carotid sinus syncope
    G90.09Other idiopathic peripheral autonomic neuropathy
    G90.1Familial dysautonomia [Riley-Day]
    G90.2Horner's syndrome
    G90.3Multi-system degeneration of the autonomic nervous system
    G90.4Autonomic dysreflexia
    G90.50Complex regional pain syndrome I, unspecified
    G90.511Complex regional pain syndrome I of right upper limb
    G90.512Complex regional pain syndrome I of left upper limb
    G90.513Complex regional pain syndrome I of upper limb, bilateral
    G90.519Complex regional pain syndrome I of unspecified upper limb
    G90.521Complex regional pain syndrome I of right lower limb
    G90.522Complex regional pain syndrome I of left lower limb
    G90.523Complex regional pain syndrome I of lower limb, bilateral
    G90.529Complex regional pain syndrome I of unspecified lower limb
    G90.59Complex regional pain syndrome I of other specified site
    G90.81Serotonin syndrome
    G90.89Other disorders of autonomic nervous system
    G90.9Disorder of the autonomic nervous system, unspecified
    G90.APostural orthostatic tachycardia syndrome [POTS]

    Showing 1–20 of 21

    DRG Codes

    9 rows

    DRG CodeDescription
    056Degenerative Nervous System Disorders with MCC
    057Degenerative Nervous System Disorders without MCC
    073Cranial and Peripheral Nerve Disorders with MCC
    074Cranial and Peripheral Nerve Disorders without MCC
    091Other Disorders of Nervous System with MCC
    092Other Disorders of Nervous System with CC
    093Other Disorders of Nervous System without CC/MCC
    791Prematurity with Major Problems
    793Full Term Neonate with Major Problems

    Typical Clinical Scenarios

    • A middle-aged patient presents to the emergency department with abrupt-onset lightheadedness, syncope, and orthostatic hypotension after a recent viral illness; bedside vital signs show a marked drop in blood pressure and tachycardia on standing, and initial workup rules out cardiac arrhythmia. An acute autonomic failure or dysautonomia related to a defined cause is suspected and a specific autonomic disorder code from this group is assigned for the acute presentation. Typical codes: G90.01, G90.09
    • An older adult with longstanding diabetes reports progressive resting tachycardia, abnormal sweating, constipation, and urinary retention over months; outpatient autonomic testing confirms generalized autonomic neuropathy affecting multiple organ systems. This chronic multisystem autonomic dysfunction is coded to reflect the diabetic autonomic involvement and chronicity. Typical codes: G90.3, G90.2
    • A patient with Parkinson disease is hospitalized for worsening falls, orthostatic dizziness, and recurrent syncope complicating their neurodegenerative condition; management focuses on stabilization and the autonomic dysfunction is documented as a comorbidity impacting treatment and prognosis. The autonomic disorder code used captures autonomic failure associated with a neurodegenerative disease. Typical codes: G90.11, G90.1

    Related Codes

    G91-HYDROCEPHALUS

    ICD-10-CM Code For Hydrocephalus: Group Overview

    G92-TOXIC-ENCEPHALOPATHY

    ICD-10-CM Code For Toxic Encephalopathy: Group Overview

    G93-OTHER-DISORDERS-OF-BRAIN

    ICD-10-CM Code For Other Disorders Of Brain: Group Overview

    G94-OTHER-DISORDERS-OF-BRAIN

    ICD-10-CM Code For Other Disorders Of Brain In Diseases Classified Elsewhere: Group Overview

    G95-OTHER-AND-UNSPECIFIED-SPINAL-CORD

    ICD-10-CM Code For Other And Unspecified Diseases Of Spinal Cord: Group Overview

    G96-OTHER-DISORDERS-OF-CENTRAL-NERVOUS-SYSTEM

    ICD-10-CM Code For Other Disorders Of Central Nervous System: Group Overview

    G97-INTRAOPERATIVE-AND-POSTPROCEDURAL-NERVOUS-SYSTEM

    ICD-10-CM Code For Intraoperative And Postprocedural Complications Of Nervous System: Group Overview

    G98-OTHER-NERVOUS-SYSTEM-DISORDERS

    ICD-10-CM Code For Other Disorders Of Nervous System Not Elsewhere Classified: Group Overview

    G99-OTHER-DISORDERS-OF-NERVOUS-SYSTEM

    ICD-10-CM Code For Other Disorders Of Nervous System In Diseases Classified Elsewhere: Group Overview

    Frequently Asked Questions

    References

    1. 1.CPT® Codes and Descriptions. AAPC. Retrieved Aug 11, 2026.Maintains the CPT code set's official descriptions and guidelines, licensed from the American Medical Association, used as the definitional source for CPT codes on this page.
    2. 2.HCPCS Quarterly Update. Centers for Medicare & Medicaid Services (CMS). Retrieved Aug 11, 2026.CMS's quarterly release of HCPCS Level II codes and short/long descriptors, the source for HCPCS code definitions and update history.
    3. 3.ICD-10-CM Full Code List. Centers for Medicare & Medicaid Services (CMS). Retrieved Aug 11, 2026.CMS's complete ICD-10-CM diagnosis code list, used to cross-reference diagnosis codes associated with this procedure or service.
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