2020 ICD-10-CM Diagnosis Code G40.409

Other generalized epilepsy and epileptic syndromes, not intractable, without status epilepticus

    2016 2017 2018 2019 2020 Billable/Specific Code
  • G40.409 is a billable/specific ICD-10-CM code that can be used to indicate a diagnosis for reimbursement purposes.
  • Short description: Oth generalized epilepsy, not intractable, w/o stat epi
  • The 2020 edition of ICD-10-CM G40.409 became effective on October 1, 2019.
  • This is the American ICD-10-CM version of G40.409 - other international versions of ICD-10 G40.409 may differ.
The following code(s) above G40.409 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 G40.409:
  • G00-G99
    2020 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 Non-Billable/Non-Specific Code
    Note
    • 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
  • G40.4
    ICD-10-CM Diagnosis Code G40.4

    Other generalized epilepsy and epileptic syndromes

      2016 2017 2018 2019 2020 Non-Billable/Non-Specific Code
    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
    Other generalized epilepsy and epileptic syndromes
  • G40.40
    ICD-10-CM Diagnosis Code G40.40

    Other generalized epilepsy and epileptic syndromes, not intractable

      2016 2017 2018 2019 2020 Non-Billable/Non-Specific Code
    Applicable To
    • Other generalized epilepsy and epileptic syndromes without intractability
    • Other generalized epilepsy and epileptic syndromes NOS
    Other generalized epilepsy and epileptic syndromes, not intractable
Approximate Synonyms
  • Lennox gastaut syndrome
  • West syndrome
ICD-10-CM G40.409 is grouped within Diagnostic Related Group(s) (MS-DRG v37.0):
  • 023 Craniotomy with major device implant or acute complex cns pdx with mcc or chemotherapy implant or epilepsy with neurostimulator
  • 100 Seizures with mcc
  • 101 Seizures without mcc

Convert G40.409 to ICD-9-CM

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

Diagnosis Index entries containing back-references to G40.409:
  • Epilepsy, epileptic, epilepsia (attack) (cerebral) (convulsion) (fit) (seizure) G40.909
    ICD-10-CM Diagnosis Code G40.909

    Epilepsy, unspecified, not intractable, without status epilepticus

      2016 2017 2018 2019 2020 Billable/Specific Code
    Applicable To
    • Epilepsy NOS
    • Epileptic convulsions NOS
    • Epileptic fits NOS
    • Epileptic seizures NOS
    • Recurrent seizures NOS
    • Seizure disorder NOS
  • Myoclonus, myoclonic, myoclonia (familial) (essential) (multifocal) (simplex) G25.3
    ICD-10-CM Diagnosis Code G25.3

    Myoclonus

      2016 2017 2018 2019 2020 Billable/Specific Code
    Applicable To
    • Drug-induced myoclonus
    • Palatal myoclonus
    Type 1 Excludes
    Use Additional
    • code for adverse effect, if applicable, to identify drug (T36-T50 with fifth or sixth character 5)
  • Seizure(s) R56.9
    - see also Convulsions
    ICD-10-CM Diagnosis Code R56.9

    Unspecified convulsions

      2016 2017 2018 2019 2020 Billable/Specific Code
    Applicable To
    • Convulsion disorder
    • Fit NOS
    • Recurrent convulsions
    • Seizure(s) (convulsive) NOS
    • grand mal G40.409
    • petit mal G40.A-
      ICD-10-CM Diagnosis Code G40.A-

      Absence epileptic syndrome

        2016 2017 2018 2019 2020 Non-Billable/Non-Specific Code
      Applicable To
      • Childhood absence epilepsy [pyknolepsy]
      • Juvenile absence epilepsy
      • Absence epileptic syndrome, NOS

ICD-10-CM Codes Adjacent To G40.409
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
G40.5 Epileptic seizures related to external causes
G40.50 Epileptic seizures related to external causes, not intractable
G40.501 …… with status epilepticus
G40.509 …… without status epilepticus
G40.8 Other epilepsy and recurrent seizures
G40.80 Other epilepsy
G40.801 …… not intractable, with status epilepticus

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