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ICD-10-CM Codes
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G00-G99
Diseases of the nervous system
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G40-G47
Episodic and paroxysmal disorders
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G40-
Epilepsy and recurrent seizures
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2021 ICD-10-CM Diagnosis Code G40.4
2021 ICD-10-CM Diagnosis Code G40.4
Other generalized epilepsy and epileptic syndromes
2016 2017 2018 2019 2020 2021 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 2021 edition of ICD-10-CM G40.4 became effective on October 1, 2020.
- 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:
- 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
Code annotations containing back-references to G40.4:
- Myoclonus, myoclonic, myoclonia (familial) (essential) (multifocal) (simplex) G25.3
ICD-10-CM Diagnosis Code G25.3
Myoclonus
2016 2017 2018 2019 2020 2021 Billable/Specific Code
Applicable To- Drug-induced myoclonus
- Palatal myoclonus
Use Additional- code for adverse effect, if applicable, to identify drug (T36-T50 with fifth or sixth character 5)
ICD-10-CM Codes Adjacent To G40.4
G40.A1 Absence epileptic syndrome, intractable
G40.A19 …… without status epilepticus
G40.B Juvenile myoclonic epilepsy [impulsive petit mal]
G40.B0 Juvenile myoclonic epilepsy, not intractable
G40.B09 …… without status epilepticus
G40.B1 Juvenile myoclonic epilepsy, intractable
G40.B19 …… without status epilepticus
G40.4
Other generalized epilepsy and epileptic syndromes
G40.40 Other generalized epilepsy and epileptic syndromes, not intractable
G40.409 …… without status epilepticus
G40.41 Other generalized epilepsy and epileptic syndromes, intractable
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
Reimbursement claims with a date of service on or after October 1, 2015 require the use of ICD-10-CM codes.
