2019 ICD-10-CM Diagnosis Code G40

Epilepsy and recurrent seizures

    2016 2017 2018 2019 Non-Billable/Non-Specific Code
  • G40 should not be used for reimbursement purposes as there are multiple codes below it that contain a greater level of detail.
  • The 2019 edition of ICD-10-CM G40 became effective on October 1, 2018.
  • This is the American ICD-10-CM version of G40 - other international versions of ICD-10 G40 may differ.
Note
  • the following terms are to be considered equivalent to intractable: pharmacoresistant (pharmacologically resistant), treatment resistant, refractory (medically) and poorly controlled
Type 1 Excludes
Type 1 Excludes Help
A type 1 excludes note is a pure excludes. It means "not coded here". A type 1 excludes note indicates that the code excluded should never be used at the same time as G40. A type 1 excludes note is for used for when two conditions cannot occur together, such as a congenital form versus an acquired form of the same condition.
  • conversion disorder with seizures (
    ICD-10-CM Diagnosis Code F44.5

    Conversion disorder with seizures or convulsions

      2016 2017 2018 2019 Billable/Specific Code
    Applicable To
    • Conversion disorder with attacks or seizures
    • Dissociative convulsions
    F44.5
    )
  • convulsions NOS (
    ICD-10-CM Diagnosis Code R56.9

    Unspecified convulsions

      2016 2017 2018 2019 Billable/Specific Code
    Applicable To
    • Convulsion disorder
    • Fit NOS
    • Recurrent convulsions
    • Seizure(s) (convulsive) NOS
    R56.9
    )
  • post traumatic seizures (
    ICD-10-CM Diagnosis Code R56.1

    Post traumatic seizures

      2016 2017 2018 2019 Billable/Specific Code
    Type 1 Excludes
    • post traumatic epilepsy (G40.-)
    R56.1
    )
  • seizure (convulsive) NOS (
    ICD-10-CM Diagnosis Code R56.9

    Unspecified convulsions

      2016 2017 2018 2019 Billable/Specific Code
    Applicable To
    • Convulsion disorder
    • Fit NOS
    • Recurrent convulsions
    • Seizure(s) (convulsive) NOS
    R56.9
    )
  • seizure of newborn (
    ICD-10-CM Diagnosis Code P90

    Convulsions of newborn

      2016 2017 2018 2019 Billable/Specific Code Code on Newborn Record
    Type 1 Excludes
    • benign myoclonic epilepsy in infancy (G40.3-)
    • benign neonatal convulsions (familial) (G40.3-)
    P90
    )
Type 2 Excludes
Type 2 Excludes Help
A type 2 excludes note represents "not included here". A type 2 excludes note indicates that the condition excluded is not part of the condition it is excluded from but a patient may have both conditions at the same time. When a type 2 excludes note appears under a code it is acceptable to use both the code (G40) and the excluded code together.
  • hippocampal sclerosis (
    ICD-10-CM Diagnosis Code G93.81

    Temporal sclerosis

      2016 2017 2018 2019 Billable/Specific Code
    Applicable To
    • Hippocampal sclerosis
    • Mesial temporal sclerosis
    G93.81
    )
  • mesial temporal sclerosis (
    ICD-10-CM Diagnosis Code G93.81

    Temporal sclerosis

      2016 2017 2018 2019 Billable/Specific Code
    Applicable To
    • Hippocampal sclerosis
    • Mesial temporal sclerosis
    G93.81
    )
  • temporal sclerosis (
    ICD-10-CM Diagnosis Code G93.81

    Temporal sclerosis

      2016 2017 2018 2019 Billable/Specific Code
    Applicable To
    • Hippocampal sclerosis
    • Mesial temporal sclerosis
    G93.81
    )
  • Todd's paralysis (
    ICD-10-CM Diagnosis Code G83.84

    Todd's paralysis (postepileptic)

      2016 2017 2018 2019 Billable/Specific Code
    G83.84
    )
The following code(s) above G40 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:
  • G00-G99
    2019 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
Clinical Information
  • A brain disorder characterized by episodes of abnormally increased neuronal discharge resulting in transient episodes of sensory or motor neurological dysfunction, or psychic dysfunction. These episodes may or may not be associated with loss of consciousness or convulsions.
  • A disorder characterized by recurrent episodes of paroxysmal brain dysfunction due to a sudden, disorderly, and excessive neuronal discharge. Epilepsy classification systems are generally based upon: (1) clinical features of the seizure episodes (e.g., motor seizure), (2) etiology (e.g., post-traumatic), (3) anatomic site of seizure origin (e.g., frontal lobe seizure), (4) tendency to spread to other structures in the brain, and (5) temporal patterns (e.g., nocturnal epilepsy). (from Adams et al., Principles of Neurology, 6th ed, p313)
  • A disorder characterized by recurrent seizures
  • A group of disorders marked by problems in the normal functioning of the brain. These problems can produce seizures, unusual body movements, a loss of consciousness or changes in consciousness, as well as mental problems or problems with the senses.
  • Brain disorder characterized by recurring excessive neuronal discharge, exhibited by transient episodes of motor, sensory, or psychic dysfunction, with or without unconsciousness or convulsive movements.
  • 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.
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
Code annotations containing back-references to G40:
  • Code Also: G04.8
    , G40.5
    , G43.1
    , I67.850
    ICD-10-CM Diagnosis Code G04.8

    Other encephalitis, myelitis and encephalomyelitis

      2016 2017 2018 2019 Non-Billable/Non-Specific Code
    Code Also
    ICD-10-CM Diagnosis Code G40.5

    Epileptic seizures related to external causes

      2016 2017 2018 2019 Non-Billable/Non-Specific Code
    Applicable To
    • Epileptic seizures related to alcohol
    • Epileptic seizures related to drugs
    • Epileptic seizures related to hormonal changes
    • Epileptic seizures related to sleep deprivation
    • Epileptic seizures related to stress
    Code Also
    • , if applicable, associated epilepsy and recurrent seizures (G40.-)
    Use Additional
    • code for adverse effect, if applicable, to identify drug (T36-T50 with fifth or sixth character 5)
    ICD-10-CM Diagnosis Code G43.1

    Migraine with aura

      2016 2017 2018 2019 Non-Billable/Non-Specific Code
    Applicable To
    • Basilar migraine
    • Classical migraine
    • Migraine equivalents
    • Migraine preceded or accompanied by transient focal neurological phenomena
    • Migraine triggered seizures
    • Migraine with acute-onset aura
    • Migraine with aura without headache (migraine equivalents)
    • Migraine with prolonged aura
    • Migraine with typical aura
    • Retinal migraine
    Code Also
    Type 1 Excludes
    ICD-10-CM Diagnosis Code I67.850

    Cerebral autosomal dominant arteriopathy with subcortical infarcts and leukoencephalopathy

      2019 - New Code Billable/Specific Code
    Applicable To
    • CADASIL
    Code Also
    • any associated diagnoses, such as:
    • epilepsy (G40.-)
    • stroke (I63.-)
    • vascular dementia (F01.-)
  • Code First: F02
    ICD-10-CM Diagnosis Code F02

    Dementia in other diseases classified elsewhere

      2016 2017 2018 2019 Non-Billable/Non-Specific Code
    Code First
    • the underlying physiological condition, such as:
    • Alzheimer's (G30.-)
    • cerebral lipidosis (E75.4)
    • Creutzfeldt-Jakob disease (A81.0-)
    • dementia with Lewy bodies (G31.83)
    • dementia with Parkinsonism (G31.83)
    • epilepsy and recurrent seizures (G40.-)
    • frontotemporal dementia (G31.09)
    • hepatolenticular degeneration (E83.0)
    • human immunodeficiency virus [HIV] disease (B20)
    • Huntington's disease (G10)
    • hypercalcemia (E83.52)
    • hypothyroidism, acquired (E00-E03.-)
    • intoxications (T36-T65)
    • Jakob-Creutzfeldt disease (A81.0-)
    • multiple sclerosis (G35)
    • neurosyphilis (A52.17)
    • niacin deficiency [pellagra] (E52)
    • Parkinson's disease (G20)
    • Pick's disease (G31.01)
    • polyarteritis nodosa (M30.0)
    • prion disease (A81.9)
    • systemic lupus erythematosus (M32.-)
    • traumatic brain injury (S06.-)
    • trypanosomiasis (B56.-, B57.-)
    • vitamin B deficiency (E53.8)
    Includes
    • Major neurocognitive disorder in other diseases classified elsewhere
    Type 2 Excludes
    • dementia in alcohol and psychoactive substance disorders (F10-F19, with .17, .27, .97)
    • vascular dementia (F01.5-)
  • Type 1 Excludes: R56
    , R56.1
    , G25.3
    ICD-10-CM Diagnosis Code R56

    Convulsions, not elsewhere classified

      2016 2017 2018 2019 Non-Billable/Non-Specific Code
    Type 1 Excludes
    • dissociative convulsions and seizures (F44.5)
    • epileptic convulsions and seizures (G40.-)
    • newborn convulsions and seizures (P90)
    ICD-10-CM Diagnosis Code R56.1

    Post traumatic seizures

      2016 2017 2018 2019 Billable/Specific Code
    Type 1 Excludes
    • post traumatic epilepsy (G40.-)
    ICD-10-CM Diagnosis Code G25.3

    Myoclonus

      2016 2017 2018 2019 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)
  • Type 2 Excludes: F44.0
    , F44.1
    ICD-10-CM Diagnosis Code F44.0

    Dissociative amnesia

      2016 2017 2018 2019 Billable/Specific Code
    Type 1 Excludes
    • amnesia NOS (R41.3)
    • anterograde amnesia (R41.1)
    • dissociative amnesia with dissociative fugue (F44.1)
    • retrograde amnesia (R41.2)
    Type 2 Excludes
    • alcohol-or other psychoactive substance-induced amnestic disorder (F10, F13, F19 with .26, .96)
    • amnestic disorder due to known physiological condition (F04)
    • postictal amnesia in epilepsy (G40.-)
    ICD-10-CM Diagnosis Code F44.1

    Dissociative fugue

      2016 2017 2018 2019 Billable/Specific Code
    Applicable To
    • Dissociative amnesia with dissociative fugue
    Type 2 Excludes
    • postictal fugue in epilepsy (G40.-)
ICD-10-CM Codes Adjacent To G40
G36.9 Acute disseminated demyelination, unspecified
G37 Other demyelinating diseases of central nervous system
G37.0 Diffuse sclerosis of central nervous system
G37.1 Central demyelination of corpus callosum
G37.2 Central pontine myelinolysis
G37.3 Acute transverse myelitis in demyelinating disease of central nervous system
G37.4 Subacute necrotizing myelitis of central nervous system
G37.5 Concentric sclerosis [Balo] of central nervous system
G37.8 Other specified demyelinating diseases of central nervous system
G37.9 Demyelinating disease of central nervous system, unspecified
G40 Epilepsy and recurrent seizures
G40.0 Localization-related (focal) (partial) idiopathic epilepsy and epileptic syndromes with seizures of localized onset
G40.00 Localization-related (focal) (partial) idiopathic epilepsy and epileptic syndromes with seizures of localized onset, not intractable
G40.001 …… with status epilepticus
G40.009 …… without status epilepticus
G40.01 Localization-related (focal) (partial) idiopathic epilepsy and epileptic syndromes with seizures of localized onset, intractable
G40.011 …… with status epilepticus
G40.019 …… without status epilepticus
G40.1 Localization-related (focal) (partial) symptomatic epilepsy and epileptic syndromes with simple partial seizures
G40.10 Localization-related (focal) (partial) symptomatic epilepsy and epileptic syndromes with simple partial seizures, not intractable
G40.101 …… with status epilepticus

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