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CPT 95829: Electrocorticogram (Intracranial EEG)
CPT code 95829 denotes an electrocorticogram (ECoG), an intracranial recording of cortical electrical activity obtained by placing electrodes on the brain surface. ECoG is a critical diagnostic and intraoperative monitoring tool for patients with complex seizure disorders, focal cortical pathology, and for guiding resective neurosurgery. As an invasive neurophysiologic procedure, it has implications for surgical planning, perioperative resource use, and specialized facility requirements nationwide.
Key payers included in this analysis are Aetna, Blue Cross Blue Shield, Cigna Health, UnitedHealthcare, and Medicare. Readers will find a concise briefing on clinical context, typical sites of service, and what to expect in claims and billing workflows for an intracranial cortical recording. The report outlines common benchmarking categories, relevant policy considerations affecting coverage and prior authorization, and operational factors such as site of care and associated surgical services.
This national overview is intended to inform coding and administrative teams about the clinical purpose of CPT code 95829, payer coverage landscape, and the types of documentation and setting information that commonly appear in claims. Data not available in the input are noted where applicable.
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Billing Code Overview
CPT code 95829 describes an electrocorticogram (ECoG), also known as an intracranial electrocorticogram (iEEG). This procedure records electrical activity directly from the cerebral cortex by placing electrodes on the brain surface. The recording captures cortical electrical signals for diagnostic and monitoring purposes, often used when noninvasive EEG is insufficient.
Service type: Intracranial neurophysiologic monitoring / diagnostic cortical recording
Typical site of service: Inpatient or outpatient surgical setting within an operating room or specialized epilepsy monitoring unit where neurosurgical electrode placement is performed.