ICD-10-CM Code G40.804

Other epilepsy, intractable, without status epilepticus

Version 2021 Replaced Code Billable Code

Valid for Submission

G40.804 is a billable code used to specify a medical diagnosis of other epilepsy, intractable, without status epilepticus. The code is valid for the fiscal year 2021 for the submission of HIPAA-covered transactions. The ICD-10-CM code G40.804 might also be used to specify conditions or terms like acquired epileptic aphasia, acquired epileptic aphasia, refractory, benign myoclonic epilepsy in infancy, benign myoclonic epilepsy in infancy, refractory, post-traumatic epilepsy, post-traumatic epilepsy, refractory, etc

Short Description:Other epilepsy, intractable, without status epilepticus
Long Description:Other epilepsy, intractable, without status epilepticus

Replaced Code

This code was replaced in the 2021 ICD-10 code set with the code(s) listed below. The National Center for Health Statistics (NCHS) has published an update to the ICD-10-CM diagnosis codes which became effective October 1, 2020. This code was replaced for the FY 2021 (October 1, 2020 - September 30, 2021).

  • G40.834 - Dravet syndrome, intractable, without status epilepticus

Index to Diseases and Injuries

The Index to Diseases and Injuries is an alphabetical listing of medical terms, with each term mapped to one or more ICD-10 code(s). The following references for the code G40.804 are found in the index:


The following clinical terms are approximate synonyms or lay terms that might be used to identify the correct diagnosis code:

  • Acquired epileptic aphasia
  • Acquired epileptic aphasia, refractory
  • Benign myoclonic epilepsy in infancy
  • Benign myoclonic epilepsy in infancy, refractory
  • Post-traumatic epilepsy
  • Post-traumatic epilepsy, refractory
  • Refractory idiopathic generalized epilepsy

Convert G40.804 to ICD-9

  • 345.81 - Epilepsy NEC w intr epil (Approximate Flag)

Code Classification

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

Code History

  • FY 2016 - New Code, effective from 10/1/2015 through 9/30/2016
    (First year ICD-10-CM implemented into the HIPAA code set)
  • FY 2017 - No Change, effective from 10/1/2016 through 9/30/2017
  • FY 2018 - No Change, effective from 10/1/2017 through 9/30/2018
  • FY 2019 - No Change, effective from 10/1/2018 through 9/30/2019
  • FY 2020 - No Change, effective from 10/1/2019 through 9/30/2020
  • FY 2021 - No Change, effective from 10/1/2020 through 9/30/2021

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

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  • Epilepsy - children (Medical Encyclopedia)
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  • Epilepsy or seizures - discharge (Medical Encyclopedia)

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