G40.509 Insurance Policy Changes

ICD-10 G40.509 is officially defined as "Epileptic seizures related to external causes, not intractable, without status epilepticus." code G40.509 is referenced in 5 tracked payer policy changes from Excellus BlueCross BlueShield, Aetna, and 1 other payer. For billers and coders, staying current on payer-specific coverage criteria, reimbursement rules, and prior-authorization requirements for code G40.509 is critical to clean claim submission. Each entry below links to the full policy analysis with effective dates and action steps.

Excellus BlueCross BlueShield · Effective Aug 20, 2026Medium impact
Vagus Nerve Stimulation and Vagus Nerve Blocking Therapy 7.01.05
Implanted vagus nerve stimulation is medically appropriate as a treatment for medically refractory seizures, and it is investigational as a treatment for depression or any other non-epileptic condition. Vagus nerve stimulation implants that detect and stimulate based on increased heart rate, such as the AspireSR Model, are investigational for all indications, and vagus nerve blocking therapy is investigational as a treatment for morbid obesity. The August 20, 2026 update was an annual review with the policy intent unchanged.
Aetna · Identified Aug 18, 2026Medium impact
Hospitalization for the Initiation of Ketogenic Diet (CPB 0226, reviewed 2026-04-23)
Aetna considers hospitalization for initiation of a ketogenic diet medically necessary for intractable seizures, including Doose syndrome and Lennox-Gastaut syndrome, when all listed selection criteria are met, and for persons with glucose transporter protein type 1 deficiency or pyruvate dehydrogenase complex deficiency. Aetna considers hospitalization for initiation of a ketogenic diet of unproven value for all other indications, including adult super-refractory status epilepticus, Alzheimer's disease, autism spectrum disorder, cancer, migraine prevention, multiple sclerosis, Parkinson's disease, schizophrenia and type 2 diabetes. Hospitalization for initiation of the Atkins diet for intractable seizures, mitochondrial diseases, or other indications is considered experimental, investigational, or unproven.
Health Net · Identified Jun 20, 2026Medium impact
20-947 Medical Policies - 3rd Quarter 2020
Medical policies approved in the third quarter of 2020 may apply to CalViva Health Medi-Cal members in Fresno, Kings and Madera counties where no California DHCS policy is available. New policies cover respiratory viral panel testing, thymus transplantation and related criteria, while updated policies change criteria for services such as trigger point injections (now a maximum of four per year, down from six), sacroiliac joint fusion, sacral nerve stimulation and mechanical stretching devices. Some codes were added, moved or removed, including L8613 (removed) and L8692 (added) for bone-anchored hearing aids.
Health Net · Identified Jun 20, 2026Medium impact
20-944 Medical Policies - 3rd Quarter 2020
Medical policies approved in the third quarter of 2020 by Centene's Corporate Clinical Policy Committee and/or Health Net's Medical Advisory Council include new policies for respiratory viral panel testing and thymus transplantation, and updated criteria for services such as trigger point injections (now a maximum of four per year, down from six), sacroiliac joint fusion, sacral nerve stimulation and mechanical stretching devices. Some codes were added, moved or removed, including L8613 (removed) and L8692 (added) for bone-anchored hearing aids.
Health Net · Identified Jun 20, 2026Medium impact
20-946 Medical Policies - 3rd Quarter 2020
Medical policies approved in the third quarter of 2020 by Centene's Corporate Clinical Policy Committee and/or Health Net's Medical Advisory Council include new policies for respiratory viral panel testing and thymus transplantation, and updated criteria for services such as trigger point injections (now a maximum of four per year, down from six), sacroiliac joint fusion, sacral nerve stimulation and mechanical stretching devices. Some codes were added, moved or removed, including L8613 (removed) and L8692 (added) for bone-anchored hearing aids. For Cal MediConnect members, Medicare and Medicaid national and local policies must be applied first for primary coverage guidance.

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FREQUENTLY ASKED QUESTIONS

What insurance policy changes affect code G40.509?

There are 5 tracked policy changes affecting code G40.509, including updates from Excellus BlueCross BlueShield, Aetna, Health Net. Each change may modify coverage criteria, reimbursement rates, or prior-authorization requirements.

Which payers have updated policy for code G40.509?

Payers that have issued tracked updates for code G40.509 include: Excellus BlueCross BlueShield, Aetna, Health Net.

How do I get notified when code G40.509 policy changes?

Create a free account at PolicyChanges.app and save a search filtered to code G40.509. You will get an email when new policy changes reference this code: daily or weekly, your choice, on every plan.

Why do payers change policies for code G40.509?

Payers revise policies for individual billing codes to align with updated clinical guidelines, CMS rule changes, fraud and abuse prevention measures, or network cost-management goals. Changes can affect medical necessity criteria, place-of-service restrictions, bundling rules, or whether a code requires prior authorization.

All billing codes J3590 C9399 J3490 99215 99213 99202

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Vagus Nerve Stimulation and Vagus Nerve Blocking Therapy 7.01.05

Hospitalization for the Initiation of Ketogenic Diet (CPB 0226, reviewed 2026-04-23)

20-947 Medical Policies - 3rd Quarter 2020

20-944 Medical Policies - 3rd Quarter 2020

20-946 Medical Policies - 3rd Quarter 2020

What insurance policy changes affect code G40.509?

Which payers have updated policy for code G40.509?

How do I get notified when code G40.509 policy changes?

Why do payers change policies for code G40.509?