Version 2024

2024 ICD-10-CM Diagnosis Code G40

Epilepsy and recurrent seizures

ICD-10-CM Code:
G40
ICD-10 Code for:
Epilepsy and recurrent seizures
Is Billable?
Not Valid for Submission
Code Navigator:

Code Classification

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

G40 is a non-specific and non-billable diagnosis code code, consider using a code with a higher level of specificity for a diagnosis of epilepsy and recurrent seizures. The code is not specific and is NOT valid for the year 2024 for the submission of HIPAA-covered transactions. Category or Header define the heading of a category of codes that may be further subdivided by the use of 4th, 5th, 6th or 7th characters.

Specific Coding Applicable to Epilepsy and recurrent seizures

Non-specific codes like G40 require more digits to indicate the appropriate level of specificity. Consider using any of the following ICD-10-CM codes with a higher level of specificity when coding for epilepsy and recurrent seizures:

  • G40.0 for Localization-related (focal) (partial) idiopathic epilepsy and epileptic syndromes with seizures of localized onset - NON-BILLABLE CODE

  • G40.00 for Localization-related (focal) (partial) idiopathic epilepsy and epileptic syndromes with seizures of localized onset, not intractable - NON-BILLABLE CODE

  • G40.01 for Localization-related (focal) (partial) idiopathic epilepsy and epileptic syndromes with seizures of localized onset, intractable - NON-BILLABLE CODE

  • G40.1 for Localization-related (focal) (partial) symptomatic epilepsy and epileptic syndromes with simple partial seizures - NON-BILLABLE CODE

  • G40.10 for Localization-related (focal) (partial) symptomatic epilepsy and epileptic syndromes with simple partial seizures, not intractable - NON-BILLABLE CODE

  • G40.11 for Localization-related (focal) (partial) symptomatic epilepsy and epileptic syndromes with simple partial seizures, intractable - NON-BILLABLE CODE

  • G40.2 for Localization-related (focal) (partial) symptomatic epilepsy and epileptic syndromes with complex partial seizures - NON-BILLABLE CODE

  • G40.20 for Localization-related (focal) (partial) symptomatic epilepsy and epileptic syndromes with complex partial seizures, not intractable - NON-BILLABLE CODE

  • G40.21 for Localization-related (focal) (partial) symptomatic epilepsy and epileptic syndromes with complex partial seizures, intractable - NON-BILLABLE CODE

  • G40.3 for Generalized idiopathic epilepsy and epileptic syndromes - NON-BILLABLE CODE

  • G40.30 for Generalized idiopathic epilepsy and epileptic syndromes, not intractable - NON-BILLABLE CODE

  • G40.31 for Generalized idiopathic epilepsy and epileptic syndromes, intractable - NON-BILLABLE CODE

  • G40.4 for Other generalized epilepsy and epileptic syndromes - NON-BILLABLE CODE

  • G40.40 for Other generalized epilepsy and epileptic syndromes, not intractable - NON-BILLABLE CODE

  • G40.41 for Other generalized epilepsy and epileptic syndromes, intractable - NON-BILLABLE CODE

  • Use G40.42 for Cyclin-Dependent Kinase-Like 5 Deficiency Disorder - BILLABLE CODE

  • G40.5 for Epileptic seizures related to external causes - NON-BILLABLE CODE

  • G40.50 for Epileptic seizures related to external causes, not intractable - NON-BILLABLE CODE

  • G40.8 for Other epilepsy and recurrent seizures - NON-BILLABLE CODE

  • G40.80 for Other epilepsy - NON-BILLABLE CODE

  • G40.81 for Lennox-Gastaut syndrome - NON-BILLABLE CODE

  • G40.82 for Epileptic spasms - NON-BILLABLE CODE

  • G40.83 for Dravet syndrome - NON-BILLABLE CODE

  • Use G40.89 for Other seizures - BILLABLE CODE

  • G40.9 for Epilepsy, unspecified - NON-BILLABLE CODE

  • G40.90 for Epilepsy, unspecified, not intractable - NON-BILLABLE CODE

  • G40.91 for Epilepsy, unspecified, intractable - NON-BILLABLE CODE

  • G40.A for Absence epileptic syndrome - NON-BILLABLE CODE

  • G40.A0 for Absence epileptic syndrome, not intractable - NON-BILLABLE CODE

  • G40.A1 for Absence epileptic syndrome, intractable - NON-BILLABLE CODE

  • G40.B for Juvenile myoclonic epilepsy [impulsive petit mal] - NON-BILLABLE CODE

  • G40.B0 for Juvenile myoclonic epilepsy, not intractable - NON-BILLABLE CODE

  • G40.B1 for Juvenile myoclonic epilepsy, intractable - NON-BILLABLE CODE

  • G40.C for Lafora progressive myoclonus epilepsy - NON-BILLABLE CODE

  • G40.C0 for Lafora progressive myoclonus epilepsy, not intractable - NON-BILLABLE CODE

  • G40.C1 for Lafora progressive myoclonus epilepsy, intractable - NON-BILLABLE CODE

Tabular List of Diseases and Injuries

The following annotation back-references are applicable to this diagnosis code. The Tabular List of Diseases and Injuries is a list of ICD-10-CM codes, organized "head to toe" into chapters and sections with coding notes and guidance for inclusions, exclusions, descriptions and more.


Type 1 Excludes

Type 1 Excludes
A type 1 excludes note is a pure excludes note. It means "NOT CODED HERE!" An Excludes1 note indicates that the code excluded should never be used at the same time as the code above the Excludes1 note. An Excludes1 is used when two conditions cannot occur together, such as a congenital form versus an acquired form of the same condition.
  • conversion disorder with seizures F44.5
  • convulsions NOS R56.9
  • post traumatic seizures R56.1
  • seizure convulsive NOS R56.9
  • seizure of newborn P90

Type 2 Excludes

Type 2 Excludes
A type 2 excludes note represents "Not included here". An excludes2 note indicates that the condition excluded is not part of the condition represented by the code, but a patient may have both conditions at the same time. When an Excludes2 note appears under a code, it is acceptable to use both the code and the excluded code together, when appropriate.

  • the following terms are to be considered equivalent to intractable: pharmacoresistant (pharmacologically resistant), treatment resistant, refractory (medically) and poorly controlled

Patient Education


Epilepsy

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


[Learn More in MedlinePlus]

Code History

  • FY 2024 - No Change, effective from 10/1/2023 through 9/30/2024
  • FY 2023 - No Change, effective from 10/1/2022 through 9/30/2023
  • FY 2022 - No Change, effective from 10/1/2021 through 9/30/2022
  • FY 2021 - No Change, effective from 10/1/2020 through 9/30/2021
  • FY 2020 - No Change, effective from 10/1/2019 through 9/30/2020
  • FY 2019 - No Change, effective from 10/1/2018 through 9/30/2019
  • FY 2018 - No Change, effective from 10/1/2017 through 9/30/2018
  • FY 2017 - No Change, effective from 10/1/2016 through 9/30/2017
  • FY 2016 - New Code, effective from 10/1/2015 through 9/30/2016. This was the first year ICD-10-CM was implemented into the HIPAA code set.