G40.309
BillableGeneralized idiopathic epilepsy and epileptic syndromes, not intractable, without status epilepticus
HCC Category Mapping
V28HCC 201 — Seizure Disorders and Convulsions
0.262V24HCC 79 — Seizure Disorders and Convulsions
0.244ESRDHCC 79 — Seizure Disorders and Convulsions
0.000RxHCCHCC 164 — Seizure Disorders, Non-Intractable Epilepsy
0.000What This Code Means
A generalized epilepsy that affects the entire brain from the start and is controllable with medication, and the patient is not currently in status epilepticus.
Coding Tips
- •This code represents well-controlled generalized idiopathic epilepsy without acute seizure complications
- •Document medication regimen and seizure frequency to establish the 'not intractable' status
Clinical Significance
This code represents the stable, well-controlled state of generalized idiopathic epilepsy — the most commonly coded presentation for patients with generalized epilepsy of unknown cause. It includes conditions like juvenile myoclonic epilepsy and childhood absence epilepsy when well-managed. Annual recapture of this diagnosis is essential for ongoing risk adjustment.
Documentation Requirements
- ✓Documentation of generalized epilepsy (bilateral onset)
- ✓Idiopathic designation (no identified structural or metabolic cause)
- ✓Current antiepileptic medication regimen and seizure control status
- ✓Seizure frequency and last seizure date if documented
- ✓Confirmation that seizures are NOT intractable and patient is NOT in status epilepticus
- ✓Type of generalized seizures (absence, myoclonic, tonic-clonic) if documented
Commonly Confused Codes
G40.301 — Same type WITH status epilepticus; acute emergencyG40.319 — Same type, intractable; drug-resistant formG40.009 — FOCAL idiopathic epilepsy; focal rather than generalized onsetG40.409 — Other generalized epilepsy, not intractable; when a specific cause is identifiedG40.909 — Epilepsy unspecified; too nonspecific when generalized type is documented
Code Hierarchy
└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
└G40.309Generalized idiopathic epilepsy and epileptic syndromes, not intractable, without status epilepticus