2023 ICD-10-CM Diagnosis Code G40.4

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Other generalized epilepsy and epileptic syndromes

    2016 2017 2018 2019 2020 2021 2022 2023 Non-Billable/Non-Specific Code
  • G40.4 should not be used for reimbursement purposes as there are multiple codes below it that contain a greater level of detail.
  • The 2023 edition of ICD-10-CM G40.4 became effective on October 1, 2022.
  • This is the American ICD-10-CM version of G40.4 - other international versions of ICD-10 G40.4 may differ.
Applicable To
  • Epilepsy with grand mal seizures on awakening
  • Epilepsy with myoclonic absences
  • Epilepsy with myoclonic-astatic seizures
  • Grand mal seizure NOS
  • Nonspecific atonic epileptic seizures
  • Nonspecific clonic epileptic seizures
  • Nonspecific myoclonic epileptic seizures
  • Nonspecific tonic epileptic seizures
  • Nonspecific tonic-clonic epileptic seizures
  • Symptomatic early myoclonic encephalopathy
The following code(s) above G40.4 contain annotation back-references
Annotation Back-References
In this context, annotation back-references refer to codes that contain:
  • Applicable To annotations, or
  • Code Also annotations, or
  • Code First annotations, or
  • Excludes1 annotations, or
  • Excludes2 annotations, or
  • Includes annotations, or
  • Note annotations, or
  • Use Additional annotations
that may be applicable to G40.4:
  • G00-G99
    2023 ICD-10-CM Range G00-G99

    Diseases of the nervous system

    Type 2 Excludes
    • certain conditions originating in the perinatal period (P04-P96)
    • certain infectious and parasitic diseases (A00-B99)
    • complications of pregnancy, childbirth and the puerperium (O00-O9A)
    • congenital malformations, deformations, and chromosomal abnormalities (Q00-Q99)
    • endocrine, nutritional and metabolic diseases (E00-E88)
    • injury, poisoning and certain other consequences of external causes (S00-T88)
    • neoplasms (C00-D49)
    • symptoms, signs and abnormal clinical and laboratory findings, not elsewhere classified (R00-R94)
    Diseases of the nervous system
  • G40
    ICD-10-CM Diagnosis Code G40

    Epilepsy and recurrent seizures

      2016 2017 2018 2019 2020 2021 2022 2023 Non-Billable/Non-Specific Code
    • the following terms are to be considered equivalent to intractable: pharmacoresistant (pharmacologically resistant), treatment resistant, refractory (medically) and poorly controlled
    Type 1 Excludes
    • 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
    Epilepsy and recurrent seizures
Clinical Information
  • A generalized tonic-clinic seizure, characterized by loss of consciousness. This type of seizure may be preceded by an aura and is frequently followed by a period of confusion and lethargy (post-ictal state).
  • A symptomatic form of epilepsy often preceded by an aura; characterized by loss of consciousness with generalized tonic- clonic seizures.
Code History
  • 2016 (effective 10/1/2015): New code (first year of non-draft ICD-10-CM)
  • 2017 (effective 10/1/2016): No change
  • 2018 (effective 10/1/2017): No change
  • 2019 (effective 10/1/2018): No change
  • 2020 (effective 10/1/2019): No change
  • 2021 (effective 10/1/2020): No change
  • 2022 (effective 10/1/2021): No change
  • 2023 (effective 10/1/2022): No change
Code annotations containing back-references to G40.4:
  • Type 2 Excludes: R25.2
    ICD-10-CM Diagnosis Code R25.2

    Cramp and spasm

      2016 2017 2018 2019 2020 2021 2022 2023 Billable/Specific Code
    Type 2 Excludes

Diagnosis Index entries containing back-references to G40.4:

ICD-10-CM Codes Adjacent To G40.4
G40.A1 Absence epileptic syndrome, intractable
G40.A11 …… with status epilepticus
G40.A19 …… without status epilepticus
G40.B Juvenile myoclonic epilepsy [impulsive petit mal]
G40.B0 Juvenile myoclonic epilepsy, not intractable
G40.B01 …… with status epilepticus
G40.B09 …… without status epilepticus
G40.B1 Juvenile myoclonic epilepsy, intractable
G40.B11 …… with status epilepticus
G40.B19 …… without status epilepticus
G40.4 Other generalized epilepsy and epileptic syndromes
G40.40 Other generalized epilepsy and epileptic syndromes, not intractable
G40.401 …… with status epilepticus
G40.409 …… without status epilepticus
G40.41 Other generalized epilepsy and epileptic syndromes, intractable
G40.411 …… with status epilepticus
G40.419 …… without status epilepticus
G40.42 Cyclin-Dependent Kinase-Like 5 Deficiency Disorder
G40.5 Epileptic seizures related to external causes
G40.50 Epileptic seizures related to external causes, not intractable
G40.501 …… with status epilepticus

Reimbursement claims with a date of service on or after October 1, 2015 require the use of ICD-10-CM codes.