Version 2024
Replaced Code

2024 ICD-10-CM Diagnosis Code G40.309

Generalized idiopathic epilepsy and epileptic syndromes, not intractable, without status epilepticus

ICD-10-CM Code:
G40.309
ICD-10 Code for:
Gen idiopathic epilepsy, 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)

G40.309 is a billable diagnosis code used to specify a medical diagnosis of generalized idiopathic epilepsy and epileptic syndromes, 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:

  • Action myoclonus renal failure syndrome
  • Atypical absence seizure
  • Benign neonatal convulsions
  • Benign neonatal familial convulsions
  • Childhood absence epilepsy
  • Early-onset Lafora body disease
  • Early-onset spastic ataxia, myoclonic epilepsy, neuropathy syndrome
  • Epilepsy with eyelid myoclonia
  • Epilepsy with generalized tonic-clonic seizures alone
  • Focal to bilateral tonic-clonic epileptic seizure
  • Generalized epilepsy
  • Glomerular disease due to action myoclonus renal failure syndrome
  • Idiopathic generalized epilepsy
  • Infantile neuronal ceroid lipofuscinosis
  • Juvenile absence epilepsy
  • Juvenile myoclonic epilepsy
  • Lipofuscinosis
  • Maternally inherited mitochondrial deoxyribonucleic acid disease
  • Myoclonic epilepsy in infancy
  • Myoclonic epilepsy with ragged red fibers
  • Neuronal ceroid lipofuscinosis
  • Progressive myoclonic epilepsy
  • Progressive myoclonic epilepsy type 3
  • Progressive myoclonic epilepsy type 5
  • Progressive myoclonic epilepsy type 6
  • Progressive myoclonic epilepsy type 7
  • Progressive myoclonic epilepsy type 8
  • Progressive myoclonic epilepsy type 9
  • Progressive myoclonic epilepsy with dystonia
  • Tonic-clonic epileptic seizure
  • Unverricht-Lundborg syndrome

Clinical Classification

Clinical Information

  • Generalized Epilepsy

    a chronic condition characterized by recurrent generalized seizures.
  • Generalized Epilepsy with Febrile Seizures Plus, Type 9|GEFSP9

    a subtype of generalized epilepsy with febrile seizures plus caused by mutation(s) in the stx1b gene, encoding syntaxin-1b.
  • Generalized Epilepsy with Febrile Seizures Plus|GEFS+

    a rare, genetically heterogeneous disorder caused by mutations in the scn1a, gabrg2, gabrd, scn9a, or stx1b genes. it is characterized by early childhood onset febrile seizures, generalized tonic-clonic seizures, absence seizures, myoclonic seizures, and atonic seizures
  • Other Generalized Epilepsy, Intractable, with Status Epilepticus|Other generalized epilepsy, intractable, with status epilepticus

    evidence of other generalized epilepsy, with status epilepticus that does not respond optimally to treatment not specified elsewhere.
  • Other Generalized Epilepsy, Intractable, without Status Epilepticus|Other generalized epilepsy, intractable, without stat epi

    evidence of other generalized epilepsy, without status epilepticus that does not respond optimally to treatment not specified elsewhere.
  • Other Generalized Epilepsy, not Intractable, with Status Epilepticus|Other generalized epilepsy, not intractable, with stat epi

    evidence of other generalized epilepsy with status epilepticus that has some acceptable treatment options not specified elsewhere.
  • Other Generalized Epilepsy, not Intractable, without Status Epilepticus|Other generalized epilepsy, not intractable, without stat epi

    evidence of other generalized epilepsy without status epilepticus that has some acceptable treatment options not specified elsewhere.
  • Susceptibility to Idiopathic Generalized Epilepsy-15|EIG15

    an autosomal dominant susceptibility to idiopathic generalized epilepsy-15, caused by mutation(s) in the rorb gene, encoding nuclear receptor ror-beta. the condition is characterized by early-onset generalized seizures and may have associated developmental delay.
  • Juvenile Absence Epilepsy

    a subtype of idiopathic generalized epilepsy, whose manifestations occur around puberty, associated with mutation(s) in the efhc1 gene, encoding ef-hand domain-containing protein 1.
  • Childhood Absence Epilepsy

    a common generalized epilepsy syndrome occurring in children, characterized by absence seizures of short duration. the cause of the syndrome is presumed to be genetic. genes which are associated with the condition are gabrb3, gabrg2, gabra1, cacna1h, gabra1, and gabra5.
  • Juvenile Myoclonic Epilepsy

    an epilepsy characterized by myoclonic jerks, generalized tonic-clonic seizures, and sometimes absence seizures. it appears during adolescence.
  • Juvenile Myoclonic Epilepsy, Intractable, with Status Epilepticus|Juvenile myoclonic epilepsy, intractable, with status epilepticus

    evidence of juvenile myoclonic epilepsy, with status epilepticus that does not respond optimally to treatment.
  • Juvenile Myoclonic Epilepsy, Intractable, without Status Epilepticus|Juvenile myoclonic epilepsy, intractable, without status epilepticus

    intractable juvenile myoclonic epilepsy which is not associated with an acute, prolonged epileptic crisis.
  • Juvenile Myoclonic Epilepsy, not Intractable, with Status Epilepticus|Juvenile myoclonic epilepsy, not intractable, with status epilepticus

    evidence of juvenile myoclonic epilepsy with status epilepticus that responds to treatment.
  • Juvenile Myoclonic Epilepsy, not Intractable, without Status Epilepticus|Juvenile myoclonic epilepsy, not intractable, without status epilepticus

    evidence of juvenile myoclonic epilepsy without status epilepticus that responds to treatment.

Replaced Code

This code was replaced in the 2024 ICD-10-CM 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, 2023. This code was replaced for the FY 2024 (October 1, 2023 - September 30, 2024).


  • G40.C09 - Lafora progr myoclonus epilepsy, not ntrct, without stat epi

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.


Inclusion Terms

Inclusion Terms
These terms are the conditions for which that code is to be used. The terms may be synonyms of the code title, or, in the case of "other specified" codes, the terms are a list of the various conditions assigned to that code. The inclusion terms are not necessarily exhaustive. Additional terms found only in the Alphabetic Index may also be assigned to a code.
  • Generalized idiopathic epilepsy and epileptic syndromes NOS

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 G40.309 to ICD-9-CM

  • ICD-9-CM Code: 345.10 - Gen cnv epil w/o intr ep
    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]

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.