G90-G99: Other disorders of the nervous system
G90: Disorders of autonomic nervous system
Disorders of the autonomic nervous system, also known as autonomic dysfunction, are a group of conditions that occur when there is damage to the nerves that control your body's automatic functions. These automatic functions include heart rate, blood pressure, digestive processes, body temperature regulation, and more. People with autonomic dysfunction can have a wide range of symptoms, depending on which parts of the autonomic nervous system are affected. Common symptoms may include dizziness and fainting, trouble with digestion, difficulty with urination, and abnormalities in heart rate and blood pressure. The causes of autonomic dysfunction can be varied and might include other illness, injury, or genetic factors. The progression of these disorders can also differ greatly from person to person, with some experiencing a gradual worsening of symptoms over time, while others may have symptoms that are intermittent or suddenly severe.
Subcodes of G90:
- G90.0: Idiopathic peripheral autonomic neuropathy
- G90.1: Familial dysautonomia [Riley-Day]
- G90.2: Horner syndrome
- G90.4: Autonomic dysreflexia
- G90.5: Complex regional pain syndrome type I
- G90.6: Complex regional pain syndrome type II
- G90.7: Complex regional pain syndrome, other and unspecified type
- G90.8: Other disorders of autonomic nervous system
- G90.9: Disorder of autonomic nervous system, unspecified
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The information provided on this page is for general educational purposes only. It is not intended for self-diagnosis and does not replace professional medical advice. Always consult your doctor or a qualified healthcare provider with any questions or concerns about your health.
If you see an ICD diagnosis code (e.g., on a medical report), be aware that doctors may also include additional indicators to express diagnostic certainty. Only a healthcare professional can interpret these codes accurately in the context of your individual case.
For a complete understanding of your condition and what the diagnosis means for you, please speak directly with your doctor.