ICD-10 Diagnosis Code G40.3

Generalized idiopathic epilepsy and epileptic syndromes

Diagnosis Code G40.3

ICD-10: G40.3
Short Description: Generalized idiopathic epilepsy and epileptic syndromes
Long Description: Generalized idiopathic epilepsy and epileptic syndromes
This is the 2017 version of the ICD-10-CM diagnosis code G40.3

Not Valid for Submission
The code G40.3 is a "header" and not valid for submission for HIPAA-covered transactions.

Code Classification
  • Diseases of the nervous system (G00–G99)
    • Episodic and paroxysmal disorders (G40-G47)
      • Epilepsy and recurrent seizures (G40)

Information for Medical Professionals

Index of Diseases and Injuries
References found for the code G40.3 in the Index of Diseases and Injuries:

Information for Patients


Epilepsy is a brain disorder that causes people to have recurring seizures. The seizures happen when clusters of nerve cells, or neurons, in the brain send out the wrong signals. People may have strange sensations and emotions or behave strangely. They may have violent muscle spasms or lose consciousness.

Epilepsy has many possible causes, including illness, brain injury, and abnormal brain development. In many cases, the cause is unknown.

Doctors use brain scans and other tests to diagnose epilepsy. It is important to start treatment right away. There is no cure for epilepsy, but medicines can control seizures for most people. When medicines are not working well, surgery or implanted devices such as vagus nerve stimulators may help. Special diets can help some children with epilepsy.

NIH: National Institute of Neurological Disorders and Stroke

  • Brain surgery
  • EEG
  • Epilepsy
  • Epilepsy - children
  • Epilepsy - children - discharge
  • Epilepsy or seizures - discharge

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