CPT code 64569 covers surgical replacement or revision of a vagus nerve electrode array and its connections to an existing pulse generator, typically performed for device malfunction or infection. This code is relevant nationally due to increasing use of implanted neurostimulation for epilepsy, depression, and other conditions, and because device-related complications often require surgical intervention with significant clinical and cost implications. Key payers considered in this analysis include Aetna, Blue Cross Blue Shield, Cigna Health, UnitedHealthcare, and Medicare. Readers will find an overview of clinical context for device revision procedures, typical sites of service, common billing modifiers, and expected coverage considerations across major payers. The publication also summarizes benchmarks where available, highlights recent policy or coding clarifications affecting device revisions, and outlines administrative considerations for claims submission and documentation. Data not available in the input is noted where applicable; the focus remains on national-level implications for clinical teams, billing departments, and policy stakeholders managing care for patients with implanted vagus nerve stimulators.