U.S. ICD-10-CM · FY 2027

G40.4 ICD-10-CM Code: Other generalized epilepsy and epileptic syndromes

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

Code definition

Official description

G40.4

Other generalized epilepsy and epileptic syndromes

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

Classification

Where G40.4 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 G40.4

    Other generalized epilepsy and epileptic syndromes

More specific choices

Codes under G40.4

G40.4 is a non-billable category. Choose the child code that best matches the documented diagnosis.

G40.40

Other generalized epilepsy and epileptic syndromes, not intractable

G40.41

Other generalized epilepsy and epileptic syndromes, intractable

G40.42

Cyclin-Dependent Kinase-Like 5 Deficiency Disorder

Documentation details

Notes for this code

Inclusion terms

  • 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

Code first

No “code first” instruction is listed for G40.4.

Use additional code

No “use additional code” instruction is listed for G40.4.

Excludes1

Conditions that should not be reported together with this code.

No Excludes1 note is listed for G40.4.

Excludes2

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

No Excludes2 note is listed for G40.4.

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 G40.4 mean?

G40.4 is the FY 2027 U.S. ICD-10-CM code for “Other generalized epilepsy and epileptic syndromes.”

Is G40.4 a billable or specific ICD-10-CM code?

No. G40.4 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 G40.4 located in ICD-10-CM?

G40.4 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 G40.4?

Its listed inclusion terms are 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. No code-first instruction is listed. No Excludes1 note is listed. No Excludes2 note is listed.

Keep exploring

Related G40 codes

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

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