G40 – Epilepsy and recurrent seizures
ICD-10-CM 2027 diagnosis code · Episodic and paroxysmal disorders
ICD-10-CM code
G40
- Code
G40(claims format:G40)- Description
- Epilepsy and recurrent seizures
- 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
Billable codes under G40
G40 is a header code and cannot be used on claims. Choose the most specific code:
- G40.0 – Localization-related (focal) (partial) idiopathic epilepsy and epileptic syndromes with seizures of localized onsetHeader (more codes below)
- G40.1 – Localization-related (focal) (partial) symptomatic epilepsy and epileptic syndromes with simple partial seizuresHeader (more codes below)
- G40.2 – Localization-related (focal) (partial) symptomatic epilepsy and epileptic syndromes with complex partial seizuresHeader (more codes below)
- G40.3 – Generalized idiopathic epilepsy and epileptic syndromesHeader (more codes below)
- G40.A – Absence epileptic syndromeHeader (more codes below)
- G40.B – Juvenile myoclonic epilepsy [impulsive petit mal]Header (more codes below)
- G40.C – Lafora progressive myoclonus epilepsyHeader (more codes below)
- G40.4 – Other generalized epilepsy and epileptic syndromesHeader (more codes below)
- G40.5 – Epileptic seizures related to external causesHeader (more codes below)
- G40.8 – Other epilepsy and recurrent seizuresHeader (more codes below)
- G40.9 – Epilepsy, unspecifiedHeader (more codes below)
Notes for G40
Excludes1 (not coded here):
Excludes2 (not included here):
Notes:
- the following terms are to be considered equivalent to intractable: pharmacoresistant (pharmacologically resistant), treatment resistant, refractory (medically) and poorly controlled
Index terms for G40
Entries in the ICD-10-CM alphabetic index that lead to this code:
Frequently asked questions
What is ICD-10 code G40?
G40 is the ICD-10-CM code for epilepsy and recurrent seizures, in the block G40-G47 (Episodic and paroxysmal disorders).
Is G40 a billable code?
No. G40 is a header code with more specific child codes; report one of the billable codes listed above.
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.