(Photo by Thomas Barwick/Getty Images) Trinity Health, a 92-hospital nonprofit health system based in Michigan, has acquired a majority ownership stake in Premier Health, an urgent care clinic operator. Premier Health is based in Baton Rouge, Louisiana, and specializes in health system-urgent care joint ventures. It currently manages more than 70 clinics across nine states on behalf of its health system partners. Through the partnership with Trinity, it will run approximately 20 preexisting urgent care clinics affiliated with the health system. Premier plans to double the number of clinics it operates in connection with Trinity and other local health systems over the next few years, according to the announcement.