2024 ICD-10-CM Diagnosis Code G40.812

Lennox-Gastaut syndrome, not intractable, without status epilepticus

ICD-10-CM Code:
G40.812
ICD-10 Code for:
Lennox-Gastaut syndrome, not intractable, w/o stat epi
Is Billable?
Yes - Valid for Submission
Chronic Condition Indicator: [1]
Chronic
Code Navigator:

Code Classification

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

G40.812 is a billable diagnosis code used to specify a medical diagnosis of lennox-gastaut syndrome, not intractable, without status epilepticus. The code is valid during the current fiscal year for the submission of HIPAA-covered transactions from October 01, 2023 through September 30, 2024.

Approximate Synonyms

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

  • Cryptogenic Lennox-Gastaut syndrome
  • Lennox-Gastaut syndrome
  • Lennox-Gastaut syndrome, non-refractory
  • Symptomatic Lennox-Gastaut syndrome

Clinical Classification

Clinical Information

  • Lennox Gastaut Syndrome

    a childhood-onset epilepsy syndrome.

Index to Diseases and Injuries References

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).

Convert G40.812 to ICD-9-CM

  • ICD-9-CM Code: 345.80 - Epilep NEC w/o intr epil
    Approximate Flag - The approximate mapping means there is not an exact match between the ICD-10 and ICD-9 codes and the mapped code is not a precise representation of the original code.

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]

Lennox-Gastaut syndrome

Lennox-Gastaut syndrome is a severe condition characterized by repeated seizures (epilepsy) that begin early in life. Affected individuals have multiple types of seizures, developmental delays, and particular patterns of brain activity measured by a test called an electroencephalogram (EEG). An EEG shows a slow spike-and-wave pattern during wakefulness and generalized paroxysmal fast activity during sleep.

In people with Lennox-Gastaut syndrome, epilepsy begins in early childhood, usually between ages 3 and 5. The most common seizure type is tonic seizures, which cause the muscles to stiffen (contract) uncontrollably. These seizures typically occur during sleep; they may also occur during wakefulness. Also common are atonic seizures, which are caused by a sudden loss of muscle tone. Tonic and atonic seizures can cause sudden falls that can result in serious or life-threatening injuries. Additionally, many affected individuals have atypical absence seizures, which cause a very brief partial or complete loss of consciousness. Other types of seizures have been reported less frequently in people with Lennox-Gastaut syndrome. Seizures associated with Lennox-Gastaut syndrome often do not respond well to therapy with anti-epileptic medications.

Although each seizure episode associated with Lennox-Gastaut syndrome is usually brief, more than two-thirds of affected individuals experience prolonged periods of seizure activity (known as status epilepticus) or episodes of many seizures that occur in a cluster.

About one-third of people with Lennox-Gastaut syndrome have normal intellectual development before seizures begin. The remainder have intellectual disability or learning problems even before seizures arise. Intellectual problems may worsen over time, particularly if seizures are very frequent or severe. Some affected children develop additional neurological abnormalities and behavioral problems. Many are also slow to develop motor skills such as sitting and crawling. As a result of their seizures and intellectual disability, most people with Lennox-Gastaut syndrome require help with daily activities. However, a small percentage of affected adults can live independently.

People with Lennox-Gastaut syndrome have a higher risk of death than their peers of the same age. Although the increased risk is not fully understood, it is partly due to poorly controlled seizures, pneumonia resulting from inhaling saliva (aspiration pneumonia) during a seizure, and injuries from falls. In addition, individuals with Lennox-Gastaut syndrome are at risk of sudden unexpected death in epilepsy (SUDEP), which describes sudden death with no known cause in someone with epilepsy; it is not the direct result of a seizure.


[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.

Footnotes

[1] Chronic - a chronic condition code indicates a condition lasting 12 months or longer and its effect on the patient based on one or both of the following criteria:

  • The condition results in the need for ongoing intervention with medical products,treatment, services, and special equipment
  • The condition places limitations on self-care, independent living, and social interactions.