Vagus Nerve Stimulation — CPB 0191 | AETNA Coverage Update

Aetna modified CPB 0191 governing vagus nerve stimulation coverage, effective September 26, 2025. Here's what billing teams need to know before submitting claims.

Aetna, a CVS Health company, updated its vagus nerve stimulation coverage policy under CPB 0191 in the Aetna system. The update affects implantable VNS procedures billed under CPT codes 64568, 64569, 64570, 61885, and 64553, along with a set of Category III codes (0908T–0912T) that carry explicit non-covered status. If your practice or facility bills for epilepsy neurostimulation, this policy shapes every prior authorization request and reimbursement claim you file with Aetna in 2025 and beyond.

Quick-Reference Table

Aetna Vagus Nerve Stimulation Coverage Criteria and Medical Necessity Requirements 2025

Aetna covers vagus nerve electrical stimulators as durable medical equipment (DME) for two distinct indications. Both require that the patient has tried and failed optimal anti-epileptic medications, has exhausted relevant surgical options, or has debilitating side effects from those medications. Both also require that the patient has no history of a bilateral or left cervical vagotomy.

Indication 1: Focal Seizures (Refractory)
The member must have focal seizures — formerly called partial onset seizures — that remain refractory despite optimal anti-epileptic drug therapy and/or surgical intervention such as a lesionectomy or medial temporal lobectomy. If surgery is not a viable option due to side effects rather than seizure persistence, that also qualifies. The key word in this coverage policy is "refractory." Document that word explicitly in your clinical notes.

Indication 2: Lennox-Gastaut Syndrome
Aetna covers VNS for Lennox-Gastaut syndrome under the same failure-of-alternatives framework. The patient must be refractory to anti-epileptic medications and/or relevant surgical intervention such as corpus callosotomy or lesional epilepsy surgery. Again, debilitating medication side effects serve as an alternative pathway to medical necessity.

Replacement and Revision
Aetna considers replacement or revision of a VNS system — including the handheld magnet — medically necessary when the original system met the medical necessity criteria, is no longer under warranty, and cannot be repaired. This matters for your DME billing team. You need documentation showing the original device was covered, the warranty status, and the repair assessment before submitting a replacement claim.

Electronic Analysis
Electronic analysis of an implanted neurostimulator pulse generator system (CPT 95970 and 95976) is covered when the underlying implant criteria are met. These are the ongoing management codes your neurology billing team should expect to see regularly in covered patients. Both codes appear in the covered list under this coverage policy.

Prior Authorization
Aetna does not explicitly describe a prior authorization workflow in the published CPB 0191 text, but VNS implantation is a surgical procedure classified as DME. Prior auth requirements vary by plan. Check the specific Aetna plan type before scheduling — commercial, Medicaid-managed, and Medicare Advantage plans each have different prior authorization thresholds. Call to verify before your team commits to a surgery date.

Aetna Vagus Nerve Stimulation Exclusions and Non-Covered Indications

The policy is clear about what Aetna will not cover. Non-invasive and transcutaneous VNS devices carry explicit non-covered status in CPB 0191.

HCPCS E0735 (non-invasive vagus nerve stimulator) is not covered. Neither is HCPCS E0770 (functional electrical stimulator, transcutaneous). If your team has been billing E0735 for externally worn devices, expect claim denial. Aetna's position is that transcutaneous VNS lacks sufficient clinical evidence to support coverage.

HCPCS C1827 (generator, neurostimulator implantable, non-rechargeable, with implantable stimulation lead and extension) is also not covered under this policy. The distinction between C1827 and the covered HCPCS codes like C1767 or L8686 is technical but financially significant. Review your HCPCS mapping before the next billing cycle.

Category III CPT codes 0908T, 0909T, 0910T, 0911T, and 0912T — all related to an integrated neurostimulation system for the vagus nerve — fall into the "no specific code" group in CPB 0191. Aetna has not assigned coverage to these codes. Until Aetna publishes specific coverage guidance for these Category III codes, assume denial risk is high.

The ICD-10 code data associated with CPB 0191 includes over 1,000 diagnosis codes, but the policy explicitly states that malignant neoplasms (C00.0–C96.9) are not covered indications for vagus nerve electrical stimulation. If a claim includes both a seizure diagnosis and an active cancer diagnosis as the primary driver of VNS, document the clinical rationale clearly. Obesity codes (E66.x) and alcohol-related disorders (F10.x) also appear in the code set but are not covered indications for VNS — they're listed to reinforce the boundary.

Coverage Indications at a Glance

Aetna Vagus Nerve Stimulation Billing Guidelines and Action Items 2025

1. Audit your HCPCS codes before the next billing cycle.
Pull every Aetna VNS claim from the last 90 days and check the HCPCS codes. If you see E0735, E0770, or C1827, those are denied under CPB 0191. Fix the mapping now — not after you get the remittance.

2. Confirm your Category III code strategy before September 26, 2025.
CPT 0908T, 0909T, 0910T, 0911T, and 0912T have no assigned coverage in this policy. If your facility uses an integrated neurostimulation system, talk to your compliance officer before the effective date of September 26, 2025. Billing these codes to Aetna without a plan invites denials with limited appeal leverage.

3. Build documentation requirements into your pre-surgical checklist.
Every VNS implant claim needs: documented seizure type (focal or Lennox-Gastaut), trial and failure of optimal anti-epileptic medications, relevant surgical history or documented surgical contraindication, side effect documentation if that's the pathway, and a cervical vagotomy history check. Missing any one of these creates a medical necessity denial.

4. Tighten replacement and revision claim documentation.
For CPT 64569 and related HCPCS replacement codes, you need three things in the file: proof the original device met coverage criteria, warranty status confirmation, and a repair assessment. Without all three, Aetna will deny the replacement as not medically necessary. Build a checklist for your DME billing coordinator.

5. Separate your ongoing management billing from your implant billing.
CPT 95970 and 95976 for electronic analysis are covered — but only when the implant itself met criteria. If the implant was never properly documented as covered, downstream analysis claims will be denied. Make sure your charge capture links the analysis codes to the original covered implant, not just to the procedure date.

6. Verify prior authorization at the plan level before scheduling implants.
CPB 0191 doesn't spell out a prior auth requirement in detail, but vagus nerve stimulation billing carries high enough dollar values that Aetna plans routinely require it. Call to verify for each patient's specific plan. Don't assume commercial and Medicare Advantage plans follow the same rules — they don't. If you're uncertain, loop in your billing consultant before scheduling.

CPT, HCPCS, and ICD-10 Codes for Vagus Nerve Stimulation Under CPB 0191

Covered CPT Codes (When Selection Criteria Are Met)

Covered HCPCS Codes (When Selection Criteria Are Met)

Not Covered / No Coverage Assigned

Key ICD-10-CM Codes in This Policy

The full ICD-10 list in CPB 0191 runs to over 1,000 codes. The categories below represent the major covered and excluded diagnosis groups.

The covered ICD-10 codes within this policy align with focal seizure disorders and Lennox-Gastaut syndrome diagnoses. Your coding team should pull the full code list from the CPB 0191 source document at Aetna's clinical policy library and map them to your patient population. Don't rely on this summary alone for ICD-10 claim-level coding — the full list is the authoritative source.