ICD-10 Code G40.019 – Localization-related (focal) (partial) idiopathic epilepsy and epileptic syndromes with seizures of localized onset, intractable, without status epilepticus (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code G40.019 – Localization-related (focal) (partial) idiopathic epilepsy and epileptic syndromes with seizures of localized onset, intractable, without status epilepticus
What it is
This code identifies idiopathic focal epilepsy with seizures that begin in one area of the brain and are described as intractable. Use it when the record states localized-onset epilepsy without status epilepticus.
Clinical signs
Clinical features vary; refer to documentation. Records may describe recurrent focal seizures with preserved or impaired awareness, and the condition is noted as difficult to control with standard therapy.
When to use this code
Use G40.019 when the provider documents idiopathic focal epilepsy, localized-onset seizures, and intractability. The diagnosis should also state that status epilepticus is not present. If the note is unclear about seizure type or control, check documentation.
Do not use for
Do not use this code for generalized epilepsy, seizure disorders without focal onset, or cases with status epilepticus. If the record does not support idiopathic and intractable features, choose a more specific or different code.
Coding tip
Match all required elements in the wording: focal, idiopathic, intractable, and without status epilepticus.