Billable / Specific Code
ICD-10-CM G40.309 is the diagnosis code for Generalized idiopathic epilepsy and epileptic syndromes, not intractable, without status epilepticus. This code falls under the section "Episodic and paroxysmal disorders" within Chapter 6 — Diseases of the nervous system (G00-G99). It is a billable/specific ICD-10-CM code that can be used to indicate a diagnosis for reimbursement purposes. Medical coders and healthcare providers use this code to document and classify diagnoses in electronic health records, insurance claims, and clinical databases.
Understanding where G40.309 sits in the ICD-10-CM classification helps ensure proper coding:
Yes, G40.309 is a billable/specific ICD-10-CM code that can be used to indicate a diagnosis for reimbursement purposes.
G40.309 is the ICD-10-CM diagnosis code for "Generalized idiopathic epilepsy and epileptic syndromes, not intractable, without status epilepticus". It is used by healthcare providers to classify and document this condition in medical records and insurance claims.
The parent code of G40.309 is G40.30 ("Generalized idiopathic epilepsy and epileptic syndromes, not intractable"). G40.309 provides a more specific classification within this category.
G40.309 is located in Section G40-G47 — "Episodic and paroxysmal disorders" within Chapter 6 of the ICD-10-CM Tabular List.
Use G40.309 when the patients documented diagnosis matches "Generalized idiopathic epilepsy and epileptic syndromes, not intractable, without status epilepticus" and the clinical documentation supports this level of specificity. Always verify with the latest ICD-10-CM guidelines and payer requirements.
The ICD-10-CM code for Generalized idiopathic epilepsy and epileptic syndromes, not intractable, without status epilepticus is G40.309.
Yes, G40.309 can be used as a primary diagnosis code since it is billable and specific.
G40.309 is in Chapter 6 of the ICD-10-CM Tabular List.
Yes, G40.309 is a valid ICD-10-CM code for the 2026 fiscal year, subject to official CMS updates.