ICD-10-CM Diagnosis Code G90.9 - Disorder of the autonomic nervous system, unspecified (original) (raw)

ICD List Logo

ICD List 2025-2026 Edition

  1. Home
  2. ICD-10-CM Codes
  3. G00–G99
  4. G89-G99
  5. G90
  6. 2026 ICD-10-CM Code G90.9

Disorder of the autonomic nervous system, unspecified

ICD-10-CM Code:

G90.9

ICD-10 Code for:

Disorder of the autonomic nervous system, unspecified

Is Billable?

Yes - Valid for Submission

Chronic Condition Indicator: [1]

Chronic

Code Navigator:

G90.9 is a billable diagnosis code used to specify a medical diagnosis of disorder of the autonomic nervous system, unspecified. The code is valid during the current fiscal year for the submission of HIPAA-covered transactions from October 01, 2025 through September 30, 2026.

Unspecified diagnosis codes like G90.9 are acceptable when clinical information is unknown or not available about a particular condition. Although a more specific code is preferable, unspecified codes should be used when such codes most accurately reflect what is known about a patient's condition. Specific diagnosis codes should not be used if not supported by the patient's medical record.

  1. Code Information
  2. Approximate Synonyms
  3. Clinical Classification
  4. Clinical Information
  5. Tabular List of Diseases and Injuries
  6. Index to Diseases and Injuries References
  8. Convert to ICD-9 Code
  9. Patient Education
  10. Other Codes Used Similar Conditions
  11. Code History

The following list of clinical terms are approximate synonyms, alternative descriptions, or common phrases that might be used by patients, healthcare providers, or medical coders to describe the same condition. These synonyms and related diagnosis terms are often used when searching for an ICD-10 code, especially when the exact medical terminology is unclear. Whether you're looking for lay terms, similar diagnosis names, or common language alternatives, this list can help guide you to the correct ICD-10 classification.

Clinical Classifications group individual ICD-10-CM diagnosis codes into broader, clinically meaningful categories. These categories help simplify complex data by organizing related conditions under common clinical themes.

They are especially useful for data analysis, reporting, and clinical decision-making. Even when diagnosis codes differ, similar conditions can be grouped together based on their clinical relevance. Each category is assigned a unique CCSR code that represents a specific clinical concept, often tied to a body system or medical specialty.

CCSR Code: NVS020

Inpatient Default: Y - Yes, default inpatient assignment for principal diagnosis or first-listed diagnosis.

Outpatient Default: Y - Yes, default outpatient assignment for principal diagnosis or first-listed diagnosis.

abnormally diminished or absent perspiration. both generalized and segmented (reduced or absent sweating in circumscribed locations) forms of the disease are usually associated with other underlying conditions.

a disorder characterized by damage to nerves that control your internal organs.

mild symptoms

moderate symptoms; limiting instrumental adl or mild/moderate impact on age-appropriate normal daily activity (pediatric)

severe symptoms; limiting self-care adl or severe impact on age-appropriate normal daily activity (pediatric)

life-threatening consequences; urgent intervention indicated

death

symptomatic; limiting instrumental adl or mild/moderate impact on age-appropriate normal daily activity (pediatric)

increase in body temperature; limiting self-care adl or severe impact on age-appropriate normal daily activity (pediatric)

life-threatening consequences; urgent intervention indicated

an inherited or acquired peripheral neuropathy affecting the autonomic nervous system. it results in disruption of the involuntary body functions. inherited causes include fabry disease and porphyrias. acquired causes include diabetes, uremia, hepatic disorders, vitamin deficiencies, toxins, and drug toxicities.

autonomic neuropathy that is caused by diabetes mellitus.

human elp1 wild-type allele is located in the vicinity of 9q31.3 and is approximately 67 kb in length. this allele, which encodes elongator complex protein 1, plays a role in the modification of trna. mutation of the gene is associated with familial dysautonomia and predisposition for medulloblastoma.

a congenital disorder caused by mutations in the ikbkap gene. it is characterized by damage of the sympathetic and parasympathetic and sensory nervous system.

an autosomal dominant condition caused by mutation(s) in the sptlc1 gene, encoding serine palmitoyltransferase long chain base subunit 1. it is characterized by distal sensory impairment with variable autonomic and motor involvement.

a rare, autosomal recessive inherited disorder caused by mutations in the ntrk1 gene. it is characterized by inability to feel pain and temperature that leads to repeated unintentional self-injuries, and decreased or absent sweating that leads to hyperpyrexia and febrile seizures.

an autosomal recessive condition caused by mutation(s) in the ngf gene, encoding beta-nerve growth factor. it is characterized by loss of pain sensation, particularly in the extremities.

a very rare disorder caused by mutation in the scn11a gene. affected individuals are unable to experience pain since birth resulting in self-inflicted injuries.

symptomatic; limiting instrumental adl

increase in body temperature; limiting self care adl

heat stroke

death

reduced sweating. causes include burns, dehydration, radiation, and leprosy.

a disorder characterized by reduced sweating.

The following annotation back-references for this diagnosis code are found in the injuries and diseases index. The Index to Diseases and Injuries is an alphabetical listing of medical terms, with each term mapped to one or more ICD-10-CM code(s).

References found for this diagnosis code in the External Cause of Injuries Index:

Below are the ICD-9 codes that most closely match this ICD-10 code, based on the General Equivalence Mappings (GEMs). This ICD-10 to ICD-9 crosswalk tool is helpful for coders who need to reference legacy diagnosis codes for audits, historical claims, or approximate code comparisons.

ICD-9-CM: 337.9

Approximate Flag - The approximate mapping means this ICD-10 code does not have an exact ICD-9 equivalent. The matched code is the closest available option, but it may not fully capture the original diagnosis or clinical intent.

Autonomic Nervous System Disorders

Your autonomic nervous system is the part of your nervous system that controls involuntary actions, such as the beating of your heart and the widening or narrowing of your blood vessels. When something goes wrong in this system, it can cause serious problems, including:

Autonomic nervous system disorders can occur alone or as the result of another disease, such as Parkinson's disease, alcoholism and diabetes. Problems can affect either part of the system, as in complex regional pain syndromes, or all of the system. Some types are temporary, but many worsen over time. When they affect your breathing or heart function, these disorders can be life-threatening.

Some autonomic nervous system disorders get better when an underlying disease is treated. Often, however, there is no cure. In that case, the goal of treatment is to improve symptoms.

NIH: National Institute of Neurological Disorders and Stroke

[Learn More in MedlinePlus]