Aetna modified CPB 0394 covering epilepsy surgery, effective September 26, 2025. Here's what billing teams need to do.
Aetna, a CVS Health company, updated its epilepsy surgery coverage policy under CPB 0394 in the Aetna system, touching more than 50 CPT and HCPCS codes. The revision covers procedures ranging from craniotomies and stereotactic radiosurgery to neurostimulator implantation and laser interstitial thermal therapy (LITT). If your practice bills CPT 61534, 61536, 61537, 61538, 61736, 61737, or any of the related neurostimulator codes (61850–61891), this policy change belongs on your radar before the effective date of September 26, 2025.
Quick-Reference Table
| Field | Detail |
|---|---|
| Payer | Aetna |
| Policy | Epilepsy Surgery — CPB 0394 |
| Policy Code | CPB 0394 |
| Change Type | Modified |
| Effective Date | September 26, 2025 |
| Impact Level | High |
| Specialties Affected | Neurosurgery, Neurology, Radiation Oncology, Epilepsy Centers |
| Key Action | Audit charge capture for all epilepsy surgery CPT and HCPCS codes against updated medical necessity criteria before September 26, 2025 |
Aetna Epilepsy Surgery Coverage Criteria and Medical Necessity Requirements 2025
The core of the Aetna epilepsy surgery coverage policy is straightforward: coverage requires that all selection criteria are met. Not most. All. That distinction drives claim denials more than any coding error.
Aetna covers epilepsy surgery procedures—including resective surgeries, corpus callosotomy, hemispherectomy, LITT, stereotactic radiosurgery, and neurostimulator implantation—when the patient meets the full set of medical necessity criteria outlined in CPB 0394. The policy groups procedures into tiers: those covered when criteria are met, those covered only if specific selection criteria are met, and those not covered for indications listed in the CPB.
Prior authorization is almost certainly required for these procedures given their complexity and cost. Confirm prior auth requirements for your specific plan type before submitting claims for CPT 61543 (partial or subtotal hemispherectomy), CPT 61541 (corpus callosum transection), or CPT 61736–61737 (LITT). These are high-cost, high-scrutiny procedures. If your team isn't running prior auth before scheduling, you're building in denial risk from day one.
The reimbursement exposure here is significant. A single LITT procedure (CPT 61736) or a craniotomy for temporal lobectomy (CPT 61537 or 61538) carries substantial facility and professional component dollars. One denial on a documentation technicality wipes out weeks of smaller-claim gains.
The Aetna epilepsy surgery billing guidelines in CPB 0394 also touch neurostimulator-related work—CPT 61863, 61864, 61867, 61868 for stereotactic electrode implantation, and CPT 61885, 61886, 61889 for pulse generator insertion or replacement. Each of those has its own medical necessity threshold. Don't assume approval on device implant carries through to later revision or replacement claims under CPT 61888 or 61880.
Aetna Epilepsy Surgery Exclusions and Non-Covered Indications
Two CPT codes are explicitly not covered for the indications listed in CPB 0394: CPT 0968T (insertion or replacement of epicranial neurostimulator system) and CPT 0969T (removal of epicranial neurostimulator system). These are Category III codes, and Aetna's position is clear—they are not covered under this policy.
Several HCPCS codes carry the same non-covered designation. These include E0733 (transcutaneous electrical nerve stimulator for trigeminal nerve stimulation) and its supply code A4541, plus a broad set of neurostimulator component codes: L8680, L8681, L8682, L8683, L8685, L8688, L8689, L8695. Also not covered: S2142 (cord blood-derived stem cell transplant, allogeneic), S2150 (bone marrow or blood-derived stem cell harvesting), S2900 (robotic surgical system use, including ROSA), and G0453 (remote intraoperative neurophysiology monitoring).
The ROSA system exclusion under S2900 is worth flagging specifically. Robotic stereotactic assistance is increasingly used in epilepsy surgery centers, and billing teams sometimes assume that if the procedure is covered, the robotic assist billing follows. Under CPB 0394, it doesn't. Bill the underlying procedure. Drop the S2900.
The cord blood and stem cell codes—38232, 38240, 38241, 38242—appear in the CPT code list under the AI/convolutional neural network algorithm group. This is a data artifact from how Aetna's system categorizes policy relationships. These codes are not standard epilepsy surgery procedures. Don't let their presence in the policy confuse your charge capture team.
Coverage Indications at a Glance
| Indication | Status | Relevant Codes | Notes |
|---|---|---|---|
| Excision of epileptogenic focus (without ECoG) | Covered — criteria met | CPT 61534 | All selection criteria must be met |
| Excision of epileptic focus (with intraoperative ECoG) | Covered — criteria met | CPT 61536 | All selection criteria must be met |
| Temporal lobectomy (without ECoG) | Covered — criteria met | CPT 61537 | All selection criteria must be met |
| Temporal lobectomy (with intraoperative ECoG) | Covered — criteria met | CPT 61538 | All selection criteria must be met |
| Corpus callosum transection | Covered — criteria met | CPT 61541 | All selection criteria must be met |
| Partial or subtotal hemispherectomy | Covered — criteria met | CPT 61543 | All selection criteria must be met |
| Selective amygdalohippocampectomy | Covered — criteria met | CPT 61566 | All selection criteria must be met |
| Multiple subpial transections with ECoG | Covered — criteria met | CPT 61567 | All selection criteria must be met |
| Laser interstitial thermal therapy (LITT), single trajectory | Covered — criteria met | CPT 61736 | Includes burr hole(s) with MRI guidance |
| LITT, multiple trajectories | Covered — criteria met | CPT 61737 | Complex/multiple lesions |
| Stereotactic radiosurgery (SRS), simple cranial lesion | Covered — criteria met | CPT 61796, 61797, 77371, 77432 | All selection criteria must be met |
| Stereotactic radiosurgery, complex cranial lesion | Covered — criteria met | CPT 61798, 61799, 77372 | All selection criteria must be met |
| Cortical neurostimulator electrode implantation | Covered — criteria met | CPT 61850, 61860 | Selection criteria required |
| Stereotactic neurostimulator electrode implantation | Covered — criteria met | CPT 61863, 61864, 61867, 61868 | Selection criteria required |
| Intracranial neurostimulator electrode revision/removal | Covered — criteria met | CPT 61880 | Covered for intractable seizures |
| Cranial neurostimulator pulse generator insertion/replacement | Covered — criteria met | CPT 61885, 61886, 61889 | Selection criteria required |
| Cranial neurostimulator pulse generator revision | Covered — criteria met | CPT 61888, 61891 | Selection criteria required |
| Vagus nerve stimulator implantation (cranial nerve electrode) | Covered — criteria met | CPT 64553 | Selection criteria required |
| Peripheral nerve electrode with integrated neurostimulator | Covered — criteria met | CPT 64596, 64597 | Selection criteria required |
| Wada activation test | Covered — criteria met | CPT 95958 | Selection criteria required |
| Electrocorticogram from implanted neurostimulator | Covered — criteria met | CPT 95836 | Selection criteria required |
| Electronic analysis of implanted neurostimulator | Covered — criteria met | CPT 95970, 95971, 95976, 95977, 95983, 95984 | Selection criteria required |
| Image-guided robotic linear accelerator SRS | Covered — criteria met | HCPCS G0339, G0340 | Selection criteria required |
| Non-rechargeable implantable neurostimulator generator | Covered — criteria met | HCPCS C1767 | Criteria must be met |
| Rechargeable dual-array neurostimulator generator | Covered — criteria met | HCPCS L8687 | Criteria must be met |
| Epicranial neurostimulator insertion/removal | Not Covered | CPT 0968T, 0969T | Not covered for listed indications |
| Trigeminal nerve TENS device and supplies | Not Covered | HCPCS E0733, A4541 | Not covered for listed indications |
| Neurostimulator component HCPCS codes | Not Covered | L8680–L8695 (select codes) | Not covered for listed indications |
| Robotic surgical system (ROSA) | Not Covered | HCPCS S2900 | Not covered — bill underlying procedure |
| Remote intraoperative neurophysiology monitoring | Not Covered | HCPCS G0453 | Not covered for listed indications |
| Cord blood/stem cell transplant codes | Not Covered | HCPCS S2142, S2150 | Not covered for listed indications |
Aetna Epilepsy Surgery Billing Guidelines and Action Items 2025
| # | Action Item |
|---|---|
| 1 | Audit your charge capture against the covered/not-covered code split before September 26, 2025. Pull every epilepsy surgery claim from the past 12 months. Compare the CPT and HCPCS codes billed against the three-tier structure in CPB 0394: covered if criteria are met, covered if selection criteria are met, and not covered. Anything in the third bucket should be flagged immediately. |
| 2 | Remove CPT 0968T, 0969T, and HCPCS S2900 from epilepsy surgery charge capture templates. These are not covered under this policy. If your CDM or charge router includes them as standard add-ons to epilepsy procedures, pull them out. Billing them generates denials and takes time to appeal—time your team doesn't have. |
| 3 | Confirm prior authorization workflows cover the full procedure set. Prior auth for a craniotomy doesn't automatically extend to intraoperative ECoG, neurostimulator implantation, or LITT. Each procedure category may need its own auth. Check that your scheduling and auth teams know which codes trigger separate PA requirements. |
| 4 | Document medical necessity at the claim level, not just in the chart. Aetna's coverage policy requires all selection criteria to be met. If your documentation only shows partial criteria, expect a denial. Work with your medical director and clinical team to build a documentation checklist tied to CPB 0394's specific requirements. This is especially important for CPT 61543 (hemispherectomy) and CPT 61736–61737 (LITT), where the clinical threshold is high. |
| 5 | Reconcile HCPCS neurostimulator component billing. The not-covered list includes L8680, L8681, L8682, L8683, L8685, L8688, L8689, and L8695. The covered list includes C1767 and L8687. These are easy to confuse in a CDM with multiple neurostimulator SKUs. Get your device billing team and your billing consultant in the same room before September 26, 2025 to map every device component to its correct coverage status. |
| 6 | Don't bill the AI/neural network-grouped codes (38232, 38240, 38241, 38242) as epilepsy surgery procedures. These bone marrow and HPC transplant codes appear in CPB 0394's code list as a system classification artifact. They do not belong on epilepsy surgery claims. If your team sees them and assumes they're covered for epilepsy indications, that's a compliance problem. Flag it now. |
| 7 | If your program bills both professional and technical components for ECoG monitoring (CPT +95940, +95941), verify the coverage group. These add-on codes fall in the AI algorithm grouping within the policy. Their billing guidelines need direct clarification from your Aetna provider relations contact or your billing consultant before the effective date. |
| Previous Version | Current Version |
|---|---|
| Coverage is considered experimental and investigational for all indications | Coverage is considered medically necessary when specific criteria are met |
| Prior authorization is not required | Prior authorization is required for initial treatment |
| Documentation must include clinical history | Documentation must include clinical history |
| Re-review every 24 months | Re-review every 12 months with updated clinical documentation |
CPT, HCPCS, and ICD-10 Codes for Epilepsy Surgery Under CPB 0394
Covered CPT Codes (When Selection Criteria Are Met)
| Code | Type | Description |
|---|---|---|
| 61534 | CPT | Craniotomy with elevation of bone flap; for excision of epileptogenic focus without electrocorticography |
| 61536 | CPT | For excision of epileptic focus, with electrocorticography during surgery |
| 61537 | CPT | For lobectomy, temporal lobe, without electrocorticography during surgery |
| 61538 | CPT | For lobectomy with electrocorticography during surgery, temporal lobe |
| 61541 | CPT | For transection of corpus callosum |
| 61543 | CPT | For partial or subtotal hemispherectomy |
| 61566 | CPT | Craniotomy with elevation of bone flap; for selective amygdalohippocampectomy |
| 61567 | CPT | Craniotomy with elevation of bone flap; for multiple subpial transections, with electrocorticography |
| 61736 | CPT | Laser interstitial thermal therapy (LITT) of lesion, intracranial, including burr hole(s), with MRI guidance |
| 61737 | CPT | LITT, multiple trajectories for multiple or complex lesion(s) |
| 61796 | CPT | Stereotactic radiosurgery; 1 simple cranial lesion |
| 61797 | CPT | Each additional cranial lesion, simple (add-on) |
| 61798 | CPT | 1 complex cranial lesion |
| 61799 | CPT | Each additional cranial lesion, complex (add-on) |
| 61800 | CPT | Application of stereotactic headframe for stereotactic radiosurgery (add-on) |
| 61850 | CPT | Twist drill or burr hole(s) for implantation of neurostimulator electrodes, cortical |
| 61860 | CPT | Craniectomy or craniotomy for implantation of neurostimulator electrodes, cerebral, cortical |
| 61863 | CPT | Stereotactic implantation of neurostimulator electrode array, twist drill/burr hole/craniotomy/craniectomy |
| 61864 | CPT | Stereotactic implantation of neurostimulator electrode array (subsequent array, add-on) |
| 61867 | CPT | Stereotactic implantation of neurostimulator electrode array |
| 61868 | CPT | Stereotactic implantation, additional electrode array (add-on) |
| 61880 | CPT | Revision or removal of intracranial neurostimulator electrodes (covered for intractable seizures) |
| 61885 | CPT | Insertion or replacement of cranial neurostimulator pulse generator or receiver, direct or inductive coupling |
| 61886 | CPT | Insertion or replacement of cranial neurostimulator pulse generator or receiver (with connection to electrode arrays) |
| 61888 | CPT | Revision or removal of cranial neurostimulator pulse generator or receiver |
| 61889 | CPT | Insertion of skull-mounted cranial neurostimulator pulse generator or receiver, including craniectomy |
| 61891 | CPT | Revision or replacement of skull-mounted cranial neurostimulator pulse generator or receiver |
| 64553 | CPT | Percutaneous implantation of neurostimulator electrode array; cranial nerve |
| 64596 | CPT | Insertion or replacement of percutaneous electrode array, peripheral nerve, with integrated neurostimulator |
| 64597 | CPT | Each additional electrode array (add-on) |
| 77371 | CPT | Radiation treatment delivery, SRS, complete course of treatment of cranial lesion(s) |
| 77372 | CPT | Radiation treatment delivery, SRS, linear accelerator based |
| 77432 | CPT | Stereotactic radiation treatment management of cranial lesion(s) (complete course) |
| 77435 | CPT | Stereotactic body radiation therapy, treatment management, per treatment course |
| 95836 | CPT | Electrocorticogram from implanted brain neurostimulator pulse generator/transmitter |
| 95958 | CPT | Wada activation test for hemispheric function, including EEG monitoring |
| 95970 | CPT | Electronic analysis of implanted neurostimulator pulse generator system |
| 95971 | CPT | Electronic analysis of implanted neurostimulator pulse generator system (with simple programming) |
| 95976 | CPT | Electronic analysis of implanted neurostimulator pulse generator/transmitter |
| 95977 | CPT | Electronic analysis of implanted neurostimulator pulse generator/transmitter (with complex programming) |
| 95983 | CPT | Electronic analysis of implanted neurostimulator pulse generator/transmitter (brain) |
| 95984 | CPT | Electronic analysis of implanted neurostimulator pulse generator/transmitter (brain, complex programming) |
CPT Codes in AI/Neural Network Algorithm Grouping
| Code | Type | Description | Note |
|---|---|---|---|
| 38232 | CPT | Bone marrow harvesting for transplantation; autologous | Policy artifact — not standard epilepsy surgery |
| 38240 | CPT | Hematopoietic progenitor cell (HPC); allogeneic transplantation per donor | Policy artifact — not standard epilepsy surgery |
| 38241 | CPT | Autologous transplantation | Policy artifact — not standard epilepsy surgery |
| 38242 | CPT | Allogeneic donor lymphocyte infusions | Policy artifact — not standard epilepsy surgery |
| +95940 | CPT | Continuous intraoperative neurophysiology monitoring, one on one, in OR | Verify billing guidelines before effective date |
| +95941 | CPT | Continuous intraoperative neurophysiology monitoring, from outside OR | Verify billing guidelines before effective date |
Not Covered CPT Codes
| Code | Type | Description | Reason |
|---|---|---|---|
| 0968T | CPT | Insertion or replacement of epicranial neurostimulator system | Not covered for indications listed in CPB 0394 |
| 0969T | CPT | Removal of epicranial neurostimulator system | Not covered for indications listed in CPB 0394 |
Other CPT Codes Related to CPB 0394
| Code | Type | Description |
|---|---|---|
| 95961 | CPT | Functional cortical and subcortical mapping by stimulation and/or recording of electrodes on brain surface |
| 95962 | CPT | Functional cortical and subcortical mapping, each additional hour (add-on) |
Covered HCPCS Codes (When Criteria Are Met)
| Code | Type | Description |
|---|---|---|
| C1767 | HCPCS | Generator, neurostimulator (implantable), non-rechargeable |
| L8687 | HCPCS | Implantable neurostimulator pulse generator, dual array, rechargeable, includes extension |
| G0339 | HCPCS | Image guided robotic linear accelerator-based SRS, complete course of therapy |
| G0340 | HCPCS | Image guided robotic linear accelerator-based SRS, delivery including collimation |
Not Covered HCPCS Codes
| Code | Type | Description | Reason |
|---|---|---|---|
| A4541 | HCPCS | Monthly supplies for use of device coded at E0733 | Not covered for indications listed in CPB 0394 |
| E0733 | HCPCS | Transcutaneous electrical nerve stimulator for trigeminal nerve stimulation | Not covered for indications listed in CPB 0394 |
| G0453 | HCPCS | Continuous intraoperative neurophysiology monitoring from outside OR (remote) | Not covered for indications listed in CPB 0394 |
| L8680 | HCPCS | Implantable neurostimulator electrode, each | Not covered for indications listed in CPB 0394 |
| L8681 | HCPCS | Patient programmer (external) for use with implantable programmable neurostimulator pulse generator | Not covered for indications listed in CPB 0394 |
| L8682 | HCPCS | Implantable neurostimulator radiofrequency receiver | Not covered for indications listed in CPB 0394 |
| L8683 | HCPCS | Radiofrequency transmitter (external) for use with implantable neurostimulator radiofrequency receiver | Not covered for indications listed in CPB 0394 |
| L8685 | HCPCS | Implantable neurostimulator pulse generator, single array, rechargeable, includes extension | Not covered for indications listed in CPB 0394 |
| L8688 | HCPCS | Implantable neurostimulator pulse generator, dual array, non-rechargeable, includes extension | Not covered for indications listed in CPB 0394 |
| L8689 | HCPCS | External recharging system for battery (internal) for use with implantable neurostimulator | Not covered for indications listed in CPB 0394 |
| L8695 | HCPCS | External recharging system for battery (external) for use with implantable neurostimulator | Not covered for indications listed in CPB 0394 |
| S2142 | HCPCS | Cord blood-derived stem cell transplantation, allogeneic | Not covered for indications listed in CPB 0394 |
| S2150 | HCPCS | Bone marrow or blood-derived stem cells, harvesting | Not covered for indications listed in CPB 0394 |
| S2900 | HCPCS | Surgical techniques requiring robotic surgical system (ROSA) | Not covered for indications listed in CPB 0394 |
Other HCPCS Codes Related to CPB 0394
| Code | Type | Description |
|---|---|---|
| C9254 | HCPCS | Injection, lacosamide, 1 mg |
| J1165 | HCPCS | Injection, phenytoin sodium, per 50 mg |
| J1953 | HCPCS | Injection, phenytoin sodium, per 50 mg |
| J2060 | HCPCS | Injection, lorazepam, 2 mg |
| J2250 | HCPCS | Injection, midazolam hydrochloride, per 1 mg |
| J2251 | HCPCS | Injection, midazolam hydrochloride (critical care), not therapeutically equivalent to J2250 |
| J2252 | HCPCS | Injection, midazolam in 0.8% sodium chloride, IV, not therapeutically equivalent to J2250 |
| J2253 | HCPCS | Injection, midazolam (Seizalam), 1 mg |
| J2560 | HCPCS | Injection, phenobarbital sodium, up to 120 mg |
| J2561 | HCPCS | Injection, phenobarbital sodium (Sezaby), 1 mg |
Key ICD-10-CM Diagnosis Codes
The CPB 0394 policy data does not list specific ICD-10-CM diagnosis codes. Work with your coding team to map appropriate G40-series epilepsy codes to the procedure codes above and confirm medical necessity documentation supports each claim.
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