What does ICD-10 code G40 mean?

ICD-10 code G40 is the standardized code used for epilepsy and recurrent seizures in medical records and coding systems.

When is ICD-10 code G40 used?

Doctors, hospitals, and insurers may use ICD-10 code G40 when recording epilepsy and recurrent seizures in a standardized format. This entry may also act as a broader category that points toward more specific child codes.

Does ICD-10 code G40 confirm a diagnosis?

No. A code helps standardize documentation and claims, but it should not be read as a substitute for a clinician's full assessment.

ICD10

ICD-10 Code G40: Epilepsy and recurrent seizures

Name: ICD-10 Code G40: Epilepsy and recurrent seizures
Creator: HealthAssure Clinical Team
Published: 2026-05-21T06:06:51.886Z

G40 is an ICD-10 diagnosis entry used to group records related to Epilepsy and recurrent seizures. You may see this entry in coding references, medical records, or claims workflows when a broader diagnosis category is being reviewed before a more specific code is chosen. ICD-10 entries help standardize how diagnoses are organized for coding, reporting, analytics, and documentation. This code sits within the broader ICD-10 area for Diseases of the nervous system (G00-G99).

Reviewed by HealthAssure Clinical TeamUpdated 21 May 2026

What is this code?

ICD-10 entries help standardize how diagnoses are organized for coding, reporting, analytics, and documentation. This code sits within the broader ICD-10 area for Diseases of the nervous system (G00-G99).

When is it used?

May be used when a clinician documents epilepsy and recurrent seizures in a patient's medical record.
May appear in hospital records, claims, referrals, and clinical documentation.
This code may act more like a grouping or parent code, so a more specific child code may be used in final documentation when available.

What it does not mean

A code alone does not explain severity, treatment plan, or outcome.
A medical code should not be treated as a substitute for a doctor's diagnosis or advice.
This entry may represent a broader category rather than the most specific billable code.

Code hierarchy

chapter

6Diseases of the nervous system (G00-G99)

block

G40-G47Episodic and paroxysmal disorders

currentG40-G47

Official coding notes

Excludes1 (do not code together)

conversion disorder with seizures (F44.5)
convulsions NOS (R56.9)
post traumatic seizures (R56.1)
seizure (convulsive) NOS (R56.9)
seizure of newborn (P90)

Excludes2 (may code together if documented)

hippocampal sclerosis (G93.81)
mesial temporal sclerosis (G93.81)
temporal sclerosis (G93.81)
Todd's paralysis (G83.84)

Where you may see this code

You may see this entry in coding references, medical records, or claims workflows when a broader diagnosis category is being reviewed before a more specific code is chosen.

Related specialists

NeurologistGeneral Physician

Sibling codes

G43Migraine G44Other headache syndromes G45Transient cerebral ischemic attacks and related syndromes G46Vascular syndromes of brain in cerebrovascular diseases G47Sleep disorders

Coding guidelines

Compatibility

Legacy code aligns to an official FY 2026 category. Frontend should resolve to the official category page and surface the billable child codes.

Legacy codes

G40

Common synonyms

Epilepsy and recurrent seizures

Frequently asked questions

About this content

This page is prepared by HealthAssure's clinical team using official coding standards from ICD-10. AI tools assist with drafting explanations, which are then reviewed and verified by healthcare professionals for accuracy. This content is for informational purposes and does not replace professional medical advice. Meet our team.