G40.3 (Generalized idiopathic epilepsy and epileptic syndromes) is an umbrella ICD-10-CM medical diagnosis code in the Diseases of the nervous system chapter. It identifies cases of generalized idiopathic epilepsy and epileptic syndromes for clinical documentation, billing and epidemiological tracking.

ICD-10-CM · Category

G40.3 — Generalized idiopathic epilepsy and epileptic syndromes

Chapter G00-G99: Diseases of the nervous system

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Sub-codes under G40.3

G40.30Generalized idiopathic epilepsy, not intractableG40.31Generalized idiopathic epilepsy, intractable

Related diagnoses

G40.0Local-rel (focal) idio epilepsy w seizures of loc onsetG40.1Local-rel (focal) symptc epilepsy w simple partial seizuresG40.2Local-rel (focal) symptc epilepsy w complex partial seizuresG40.AAbsence epileptic syndromeG40.BJuvenile myoclonic epilepsy [impulsive petit mal]G40.CLafora progressive myoclonus epilepsyG40.4Other generalized epilepsy and epileptic syndromesG40.5Epileptic seizures related to external causesG40.8Other epilepsy and recurrent seizuresG40.9Epilepsy, unspecified

Common questions about G40.3 (Generalized idiopathic epilepsy and epileptic syndromes)

What does ICD-10 code G40.3 mean?
G40.3 is the ICD-10-CM 2025 code for Generalized idiopathic epilepsy and epileptic syndromes. ICD-10-CM is the medical coding system used by clinicians, hospitals and insurers worldwide to classify diseases and conditions in a standard way.
Is G40.3 a billable diagnosis code?
G40.3 is a category-level (umbrella) code rather than a billable specific code. For billing purposes, clinicians typically use a more specific sub-code under G40.3. Browse the sub-codes listed on this page.
Which ICD-10 chapter does G40.3 belong to?
G40.3 belongs to the chapter "Diseases of the nervous system" (codes G00-G99). ICD-10-CM organises codes into 22 chapters by body system or condition type, which helps clinicians navigate related diagnoses.
Where can I get plain-language information about Generalized idiopathic epilepsy and epileptic syndromes?
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Source: ICD-10-CM 2025 (Centers for Medicare & Medicaid Services, public domain). Codes valid from October 1, 2024. CMS source ↗