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ICD-10 diagnosis code

G40.5 Special epileptic syndromes

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G40.5 is the ICD-10 code for Special epileptic syndromes. It is a four-character subcategory of G40 (Epilepsy), the most specific level in the WHO edition. It belongs to the block G40–G47 (Episodic and paroxysmal disorders) in Chapter VI, Diseases of the nervous system.

Code type
Subcategory (4 characters)
Chapter
VI · G00–G99
Classification
WHO ICD-10, 2019 version

What G40.5 includes

Conditions and terms that are coded here.

  • Epilepsia partialis continua [Kozhevnikof]
  • Epileptic seizures related to:
    • alcohol
    • drugs
    • hormonal changes
    • sleep deprivation
    • stress

Coding notes

  • Use additional external cause code (Chapter XX), if desired, to identify drug, if drug-induced.

G40.5 in national editions

Countries report with their own edition of ICD-10. Most keep the WHO code and add more specific codes beneath it.

SwedenICD-10-SE

G40.5Speciella epileptiska syndrom

NorwayICD-10-NO

G40.5Spesielle epileptiske syndromer

DenmarkICD-10-DK

DG405Specielt epileptisk syndrom

  • DG405KEpilepsia partialis continua
  • DG405LEpilepsi med kontinuerlige spike waves under slow wave søvn
FinlandICD-10-FI

G40.5Erityiset epileptiset oireyhtymät

  • G40.50Eplepsia partialis continua (Kojevnikof)
  • G40.51Alkoholin käyttöön liittyvät epileptiset kohtaukset
  • G40.59Muu erityinen epileptinen oireyhtymä
GermanyICD-10-GM

G40.5Spezielle epileptische Syndrome

FranceICD-10-FR

G40.5Syndromes épileptiques particuliers

NetherlandsICD-10-NL

G40.5speciale epileptische syndromen

United StatesICD-10-CM

Listed through more specific codes:

  • G40.501Epileptic seizures related to external causes, not intractable, with status epilepticus
  • G40.509Epileptic seizures related to external causes, not intractable, without status epilepticus

Based on the World Health Organization’s International Statistical Classification of Diseases and Related Health Problems, 10th revision (ICD-10), 2019 version, and the national editions published by each country’s health authority. This page is a reference, not coding advice; follow your national coding rules when you report.

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