BlueCross BlueShield of Tennessee Medical Policy Manual

Vagal Nerve Blocking Therapy for Treatment of Obesity


Vagal nerve blocking therapy for the treatment of obesity consists of an implantable device (e.g., Maestro® System ) that delivers electrical stimulation to branches of the vagus nerve on the anterior abdominal wall.  The intent is to intermittently block signals to the intra-abdominal vagus nerve to disrupt hunger sensations and induce feelings of satiety. The Maestro system is intended for individuals with a BMI of 40 – 45 or with a BMI of 35 – 39.9 and one or more obesity-related health condition.




The evidence for vagal nerve blocking therapy consists of two industry-sponsored, randomized controlled trials and the primary efficacy outcomes were not met for either trial.


BlueCross BlueShield Association. Medical Policy Reference Manual. (2:2018). Vagal nerve blocking therapy for treatment of obesity. (7.01.150). Retrieved March 14, 2018 from BlueWeb. (9 articles and/or guidelines reviewed)

California Technology Assessment Forum. (2015, August). Controversies in obesity management. Retrieved April 20, 2017 from

ECRI Institute. Emerging Technology Evidence Report. (2017, May). Rechargeable vagal blocking system (Maestro) for treating obesity. Retrieved January 9, 2019 from ECRI Institute. (138 articles and/or guidelines reviewed)

Ikramuddin, S., Blackstone, R., Brancatisano, A., Toouli, J., Shah, S., Wolfe, B., et al. (2014). Effect of reversible intermittent intra-abdominal vagal nerve blockade on morbid obesity: the recharge randomized clinical trial. Journal of American Medical Association, 312 (9), 915-922. (Level 1 evidence)

Sarr, M., Billington, C., Brancatisano, R., Brancatisano, A., Toouli, J., Kow, L., et al. (2012). The EMPOWER study: randomized, prospective, double-blind, multicenter trial of vagal blockade to induce weight loss in morbid obesity. Obesity Surgery, DOI 10.1007/s11695-012-0751-8. (Level 1 evidence)

U. S. Food and Drug Administration. (January, 2015). Center for Devices and Radiologic Health. (PMA) Pre-market approval decisions for January 2015. Retrieved June 22, 2015 from

U.S. Preventive Services Task Force. (2012). Screening for and management of obesity in adults: U.S. preventive services task force recommendation statement. Retrieved June 22, 2015 from




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