G40.4 – Other generalized epilepsy and epileptic syndromes
ICD-10-CM 2027 diagnosis code · Episodic and paroxysmal disorders
- Code
G40.4(claims format:G404)- Description
- Other generalized epilepsy and epileptic syndromes
- Billable
- No – use a more specific code below
- Valid for
- Dates of service October 1, 2026 – September 30, 2027 (FY2027)
- Chapter
- 6. Diseases of the nervous system (G00-G99)
- Block
- G40-G47 Episodic and paroxysmal disorders
- Parent codes
- G40
Billable codes under G40.4
G40.4 is a header code and cannot be used on claims. Choose the most specific code:
- G40.40 – Other generalized epilepsy and epileptic syndromes, not intractableHeader (more codes below)
- G40.41 – Other generalized epilepsy and epileptic syndromes, intractableHeader (more codes below)
- G40.42 – Cyclin-Dependent Kinase-Like 5 Deficiency DisorderBillable
Notes for G40.4
- 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
Notes inherited from parent codes
Instructional notes at a category or block level apply to every code below it.
G40 – Epilepsy and recurrent seizures
- the following terms are to be considered equivalent to intractable: pharmacoresistant (pharmacologically resistant), treatment resistant, refractory (medically) and poorly controlled
Index terms for G40.4
Entries in the ICD-10-CM alphabetic index that lead to this code:
Related codes in G40
- G40.0 – Localization-related (focal) (partial) idiopathic epilepsy and epileptic syndromes with seizures of localized onsetHeader
- G40.1 – Localization-related (focal) (partial) symptomatic epilepsy and epileptic syndromes with simple partial seizuresHeader
- G40.2 – Localization-related (focal) (partial) symptomatic epilepsy and epileptic syndromes with complex partial seizuresHeader
- G40.3 – Generalized idiopathic epilepsy and epileptic syndromesHeader
- G40.A – Absence epileptic syndromeHeader
- G40.B – Juvenile myoclonic epilepsy [impulsive petit mal]Header
- G40.C – Lafora progressive myoclonus epilepsyHeader
- G40.5 – Epileptic seizures related to external causesHeader
- G40.8 – Other epilepsy and recurrent seizuresHeader
- G40.9 – Epilepsy, unspecifiedHeader
Frequently asked questions
What is ICD-10 code G40.4?
G40.4 is the ICD-10-CM code for other generalized epilepsy and epileptic syndromes, in the block G40-G47 (Episodic and paroxysmal disorders).
Is G40.4 a billable code?
No. G40.4 is a header code with more specific child codes; report one of the billable codes listed above.
What category does G40.4 belong to?
It belongs to category G40 – Epilepsy and recurrent seizures.
Source: CDC/NCHS ICD-10-CM FY2027 code files, tabular list and index. Reference only – code assignment must follow the official ICD-10-CM guidelines and documentation in the medical record.