United Surgical Partners International, Inc | 68,060 followers on LinkedIn. Every Day Giving Excellence | United Surgical Partners International (USPI) is the largest ambulatory surgery platform in the country and operates ambulatory surgery centers and surgical hospitals. The company was founded in 1998 with a promise to deliver high-quality, lower-cost solutions to the communities it serves by forming collaborations with other like-minded institutions and physicians. USPI is part of Tenet Healthcare, which provides access to additional resources and a greater network of care.