61533 Insurance Policy Changes

Grid Monitoring and Intraoperative Electroencephalography (CPB 0289, reviewed 2026-04-17)

Aetna's updated Grid Monitoring and Intraoperative EEG policy (CPB 0289) establishes clear medical necessity criteria for intraoperative EEG during carotid artery surgery, intracranial vascular procedures, and parietal tumor resection, and for grid monitoring in intractable seizure cases. The policy explicitly excludes coverage for intraoperative EEG used to monitor anesthetic depth and designates it as experimental, as well as excludes grid monitoring for non-listed indications. Billing teams must verify medical necessity documentation before submitting claims and apply the specific covered CPT/HCPCS codes only when selection criteria are met.