This S.F. healthcare startup says it saves Linkedin, Square and Visa 20 percent on health care costs

Bay Area companies are groaning under the ever-increasing costs of providing health care to employees.

Enter San Francisco-based Crossover Health, a little-known startup that is hooking some of the Bay Area’s largest companies — such as Linkedin, Square and Visa — as clients. According to Crossover’s data, the company saves customers an average of 20 percent on healthcare costs while offering employees a simpler and more comprehensive health care experience.

For large companies that pay…