ICD-10 Code G40.90 – Epilepsy, unspecified, not intractable (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code G40.90 – Epilepsy, unspecified, not intractable
What it is
G40.90 identifies epilepsy when the type is not specified and the seizures are not described as intractable. Use it when the record confirms epilepsy but does not name a more specific seizure syndrome.
Clinical signs
Clinical features vary; refer to documentation. Epilepsy is typically characterized by recurrent unprovoked seizures, but the exact seizure type, frequency, and control status should be documented before coding.
When to use this code
Use this code when the provider documents epilepsy without further detail and there is no indication that the condition is intractable. It may fit follow-up visits, problem lists, or encounters where the seizure disorder is confirmed but not further classified.
If the note later specifies a seizure type, epilepsy syndrome, or intractability, you should code the more specific documented diagnosis instead. Check documentation for any associated status epilepticus or other seizure-related conditions.
Do not use for
Do not use G40.90 for seizures that are not diagnosed as epilepsy, or when the record states intractable epilepsy. Also avoid it if a more specific epilepsy code is documented.
Coding tip
When the provider simply writes “epilepsy” and gives no subtype, G40.90 is the default only if intractability is not documented.