ICD-10-CM · Category
G40.9 — Epilepsy, unspecified
Chapter G00-G99: Diseases of the nervous system
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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 seizuresG40.3Generalized idiopathic epilepsy and epileptic syndromesG40.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 seizures
Common questions about G40.9 (Epilepsy, unspecified)
What does ICD-10 code G40.9 mean?
G40.9 is the ICD-10-CM 2025 code for Epilepsy, unspecified. 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 G40.9 a billable diagnosis code?
G40.9 is a category-level (umbrella) code rather than a billable specific code. For billing purposes, clinicians typically use a more specific sub-code under G40.9. Browse the sub-codes listed on this page.
Which ICD-10 chapter does G40.9 belong to?
G40.9 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 Epilepsy, unspecified?
For a plain-language explanation of Epilepsy, unspecified, ask GoDavaii's Health AI - it explains medical conditions in 22+ Indian languages, free, with no signup. Tap "Ask GoDavaii AI about Epilepsy, unspecified" above to get a personalised answer.
Source: ICD-10-CM 2025 (Centers for Medicare & Medicaid Services, public domain). Codes valid from October 1, 2024. CMS source ↗