G40.309

Billable

ChapterG00–G99

Ranksubcategory

Official Description

Generalized idiopathic epilepsy and epileptic syndromes, not intractable, without status epilepticus

Metadata & Insights

•2026 ICD-10-CM Edition - Effective October 1, 2025.
•Billable/specific code (valid for reimbursement).
•Chapter 6: Diseases of the Nervous System (G00-G99).

Instructional Notes

Includes

Generalized idiopathic epilepsy and epileptic syndromes NOS

General instructions are available for the parent sections:

View CH6 Notes View G40 Notes View G40.3 Notes View G40.30 Notes

Clinical Hierarchy

CH6Diseases of the nervous system (G00-G99)

G40-G47Episodic and paroxysmal disorders (G40-G47)

G40Epilepsy and recurrent seizures

G40.3Generalized idiopathic epilepsy and epileptic syndromes

G40.30Generalized idiopathic epilepsy and epileptic syndromes, not intractable

G40.309Generalized idiopathic epilepsy and epileptic syndromes, not intractable, without status epilepticus

Applicable Ancestor Context

The following parent sections contain instructions or notes that apply to G40.309:

subcategoryG40.30

Generalized idiopathic epilepsy and epileptic syndromes, not intractable

View context instructions

subcategoryG40.3

Generalized idiopathic epilepsy and epileptic syndromes

View context instructions

categoryG40

Epilepsy and recurrent seizures

View context instructions

chapterCH6

Diseases of the nervous system (G00-G99)

View context instructions

Alphabetic Index Mentions

These are Diagnosis Index lookup paths that route to G40.309. Use them as entry terms for search, then confirm final coding instructions in the Tabular List and notes above.

6 raw paths

Epilepsy, epileptic, epilepsia (attack) (cerebral) (convulsion) (fit) (seizure)6 unique routes

generalized(3 variants)

idiopathic→G40.309(3 variants)

not intractable→G40.309(2 variants)

without status epilepticus→G40.309

syndromes(3 variants)

generalized(3 variants)

idiopathic→G40.309(3 variants)

not intractable→G40.309(2 variants)

without status epilepticus→G40.309

MS-DRG Classification

2026 v43.1

This code is grouped within the following Diagnosis Related Group(s) for clinical reimbursement:

DRG 023

Craniotomy with Major Device Implant or Acute Complex CNS Principal Diagnosis with MCC or Antineoplastic Implant or Epilepsy with Neurostimulator

Cross Reference

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