CPT code 61531 represents a neurosurgical procedure that removes a portion of skull bone and places electrodes in the subdural space for seizure monitoring. This procedure is used in the evaluation of patients with medically refractory epilepsy to localize seizure onset prior to further surgical intervention. As an advanced intracranial monitoring technique, it carries implications for surgical planning, hospital resource utilization, and payer coverage policies nationally.

Key national payers discussed include Aetna, Blue Cross Blue Shield, Cigna Health, UnitedHealthcare, and Medicare. Readers will find a concise overview of the clinical purpose and typical care setting for the procedure, common billing modifiers associated with complex surgical services, and guidance on where to look for payer-specific coverage rules. The publication summarizes benchmarks and policy-relevant considerations such as site-of-service expectations, inpatient monitoring needs, and typical clinical indications for invasive subdural electrode placement.

This analysis provides clinicians, coders, and policy stakeholders with a focused explanation of the code’s clinical context, the payer landscape addressed, and the types of operational and coverage topics to review when managing claims and preauthorization for intracranial seizure monitoring.