G40.31 – Generalized idiopathic epilepsy and epileptic syndromes, intractable
ICD-10-CM 2027 diagnosis code · Episodic and paroxysmal disorders
ICD-10-CM code
G40.31
- Code
G40.31(claims format:G4031)- Description
- Generalized idiopathic epilepsy and epileptic syndromes, intractable
- Short description
- Generalized idiopathic epilepsy, intractable
- 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 › G40.3
Billable codes under G40.31
G40.31 is a header code and cannot be used on claims. Choose the most specific code:
Notes inherited from parent codes
Instructional notes at a category or block level apply to every code below it.
G40 – Epilepsy and recurrent seizures
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
G40.3 – Generalized idiopathic epilepsy and epileptic syndromes
Code also:
- MERRF syndrome, if applicable (E88.42)
Related codes in G40.3
Frequently asked questions
What is ICD-10 code G40.31?
G40.31 is the ICD-10-CM code for generalized idiopathic epilepsy and epileptic syndromes, intractable, in the block G40-G47 (Episodic and paroxysmal disorders).
Is G40.31 a billable code?
No. G40.31 is a header code with more specific child codes; report one of the billable codes listed above.
What category does G40.31 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.