Intraoperative Neurophysiological Monitoring — CPB 0697 | AETNA Coverage Update

TL;DR: Aetna, a CVS Health company, modified CPB 0697 governing intraoperative neurophysiological monitoring (IONM) coverage, effective March 6, 2026. Here's what your billing team needs to act on now.

This update to the Aetna IONM coverage policy touches CPT codes across EMG, evoked potentials, nerve conduction studies, and EEG — codes like 95925, 95926, 95928, 95929, and 95955, among hundreds of surgical procedure codes. If your practice performs or bills for IONM during spine, vascular, or neurosurgical cases, this policy change has direct reimbursement consequences. The rules around who can bill, how they must document, and when IONM is covered at all are tightly drawn — and the margin for error is thin.

Quick-Reference Table

Aetna Intraoperative Neurophysiological Monitoring Coverage Criteria and Medical Necessity Requirements 2026

The Aetna IONM coverage policy under CPB 0697 ties medical necessity to a specific set of conditions — not just the presence of a surgical procedure that "might benefit" from monitoring. Aetna will not pay for IONM simply because a surgeon ordered it.

Who can perform and bill IONM matters as much as what they do. The monitoring physician or certified professional must be specialty trained, must not be a member of the surgical team, and must give undivided attention to a single patient during the surgery. That last point is the one most billing teams get wrong. If your IONM physician is interpreting signals for two simultaneous cases, Aetna will not reimburse either claim. The policy is explicit: claims for more than one patient cannot be submitted during the same time interval.

For remote monitoring arrangements, a trained technician must be in continuous attendance in the operating room. That technician must have real-time communication — either auditory or written — with the supervising physician. If that communication link isn't documented, the claim for continuous intraoperative neurophysiology monitoring (CPT 95940 or G0453) fails. And if 95940 or G0453 fails medical necessity review, none of the additional neuromonitoring codes are payable. They fall with it.

Note: CPT 95940 and G0453 appear in the policy narrative as the gateway codes for continuous intraoperative neurophysiology monitoring. These codes are referenced extensively in the coverage criteria. However, they could not be independently verified in the code listing tables included in the policy data provided to PayerPolicy. Review the full CPB 0697 policy at app.payerpolicy.org/p/aetna/0697 to confirm their status in the complete code tables before billing.

Baseline testing has its own rules. Pre-surgical baseline studies are separately reportable — but only if the interpretation happens before the surgical procedure begins, not during it. The record must document signal strength, clarity, and amplitude across multiple leads. Testing performed after the incision opens does not qualify as baseline and is not separately billable.

For continuous IONM billing, do not bill increments under eight minutes. Aetna will not pay for them.

Prior authorization requirements vary by plan and procedure, but the underlying medical necessity standard applies regardless. If you're billing Aetna for IONM, assume documentation will be pulled and reviewed. The medical record must show the anatomic location of the surgery, the rationale for the monitoring modalities selected, baseline signal data, changes detected during the procedure, and any interventions taken in response to those changes. The surgeon's operative note must separately state whether monitoring remained stable — and if not, what was done.

The evoked potential report must name which nerves were tested, latency values at multiple testing points, and whether results were normal or abnormal. A report that says "monitoring performed without incident" is not enough. Aetna's billing guidelines require specificity.

Aetna IONM Exclusions and Non-Covered Indications

The biggest coverage wall in this policy is the lumbar spine exclusion. Aetna does not cover IONM during lumbar spine surgery below the end of the spinal cord — generally at the L1/L2 level. This affects a large number of commonly billed surgical codes.

Look at the procedure code list: CPT codes for lumbar spine excisions (22100–22116), osteotomies (22206–22226), fracture and dislocation repairs (22310–22328), and vertebroplasty/vertebral augmentation (22510, 22511) all carry the explicit notation that IONM is not covered for lumbar surgery below L1/L2. The spinal cord ends there. Aetna's position is that there's no neural structure at risk that monitoring would protect — so there's no covered purpose.

This is a common source of claim denial. Surgeons order IONM out of habit or protocol, the monitoring team bills it, and Aetna denies it. If your practice performs high volumes of lumbar decompression or fusion surgery, audit your current IONM billing against this exclusion before the March 6, 2026 effective date.

IONM is also not covered when the service doesn't meet the "contemporaneous interpretation" standard. If the monitoring physician is reviewing recorded data after the fact rather than interpreting signals in real time during the procedure, the claim does not meet medical necessity under this coverage policy.

Coverage Indications at a Glance

Aetna IONM Billing Guidelines and Action Items 2026

These aren't suggestions. Act on them before March 6, 2026.

CPT, HCPCS, and ICD-10 Codes for Intraoperative Neurophysiological Monitoring Under CPB 0697

Covered CPT Codes — Neurophysiology Monitoring (When Selection Criteria Are Met)

Covered CPT Codes — Surgical Procedures Where IONM May Be Covered (When Selection Criteria Are Met)

Note: IONM is explicitly not covered for lumbar spine surgery below the end of the spinal cord at L1/L2. The surgical codes below carry this restriction where indicated. Confirm anatomic level before billing IONM alongside these procedures.

The full CPB 0697 surgical procedure code list contains more than 3,100 CPT codes. The codes above represent the codes included in the policy data provided. Review the full policy at app.payerpolicy.org/p/aetna/0697 for the complete list.