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U.S. ICD-10-CM · FY 2027

G40 ICD-10-CM Code: Epilepsy and recurrent seizures

A clear reference for the official code description, hierarchy, and related coding information from the FY 2027 U.S. release.

Code definition

Official description

G40

Epilepsy and recurrent seizures

ICD-10-CM diagnosis code · United States clinical modification

Classification

Where G40 sits

  1. 1

    Chapter 6

    Diseases of the nervous system (G00-G99)

  2. 2

    Section

    Episodic and paroxysmal disorders (G40-G47)

  3. 3

    Category G40

    Epilepsy and recurrent seizures

  4. 4

    Code G40

    Epilepsy and recurrent seizures

More specific choices

Codes under G40

G40 is a non-billable category. Choose the child code that best matches the documented diagnosis.

G40.0

Localization-related (focal) (partial) idiopathic epilepsy and epileptic syndromes with seizures of localized onset

G40.1

Localization-related (focal) (partial) symptomatic epilepsy and epileptic syndromes with simple partial seizures

G40.2

Localization-related (focal) (partial) symptomatic epilepsy and epileptic syndromes with complex partial seizures

G40.3

Generalized idiopathic epilepsy and epileptic syndromes

G40.4

Other generalized epilepsy and epileptic syndromes

G40.5

Epileptic seizures related to external causes

G40.8

Other epilepsy and recurrent seizures

G40.9

Epilepsy, unspecified

G40.A

Absence epileptic syndrome

G40.B

Juvenile myoclonic epilepsy [impulsive petit mal]

G40.C

Lafora progressive myoclonus epilepsy

Documentation details

Notes for this code

Inclusion terms

No inclusion terms are listed for G40.

Code first

No “code first” instruction is listed for G40.

Use additional code

No “use additional code” instruction is listed for G40.

Excludes1

Conditions that should not be reported together with this code.

  • 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

Conditions not included here that may be reported separately when present.

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

Transparency

Source and release

Data release

U.S. ICD-10-CM · FY 2027

Effective date

Oct 1, 2026

Publisher

Vero Scribe Inc.

This reference is generated from Vero’s ICD-10-CM description, hierarchy, and code-note dataset. The visible content and structured data share that source.

Review the CDC/NCHS ICD-10-CM source

Code-specific guidance

Frequently asked questions

What does ICD-10-CM code G40 mean?

G40 is the FY 2027 U.S. ICD-10-CM code for “Epilepsy and recurrent seizures.”

Is G40 a billable or specific ICD-10-CM code?

No. G40 has more specific child codes in the FY 2027 reference data. Select the code that matches the documentation and confirm the active code set and payer requirements.

Where is G40 located in ICD-10-CM?

G40 is listed in Chapter 6, Diseases of the nervous system (G00-G99), within Episodic and paroxysmal disorders (G40-G47) (G40–G47), under category G40, Epilepsy and recurrent seizures.

What coding notes are listed for G40?

No inclusion terms are listed for G40 in this reference record. No code-first instruction is listed. Excludes1 notes: 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 notes: hippocampal sclerosis (G93.81); mesial temporal sclerosis (G93.81); temporal sclerosis (G93.81); Todd's paralysis (G83.84).

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