ICD-10 Code G40.50 – Epileptic seizures related to external causes, not intractable (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code G40.50 – Epileptic seizures related to external causes, not intractable
What it is
G40.50 identifies epilepsy with seizures linked to an external cause, and the condition is not described as intractable. Use it when documentation supports a seizure disorder associated with an outside trigger or cause.
Clinical signs
Clinical features vary; refer to documentation. You may see recurrent seizures, altered awareness, convulsions, or other epileptic events, with notes indicating an external cause rather than an idiopathic epilepsy pattern.
When to use this code
Use this code when the provider documents epileptic seizures related to an external cause and specifically states they are not intractable. It fits records that identify a seizure disorder with an outside precipitating factor or linked injury context. If the cause or seizure type is unclear, check documentation.
Do not use for
Do not use this code for intractable epilepsy, or when the record does not support an external cause. If the event is a non-epileptic seizure, syncope, or another neurologic episode, this code is not appropriate.
Coding tip
Confirm both elements in the note: external cause and not intractable.