Within seconds, she had the name of another drug that had worked in comparable cases. "It gives you access to data, and data is king," Mariwalla says of Modernizing Medicine. "It's been very helpful, especially in clinically challenging situations."

The system, one of a growing number of similar tools around the country, lets Mariwalla tap the collective knowledge gathered from roughly 3,700 providers and more than 14 million patient visits, as well as data on treatments other doctors have provided to patients with similar profiles. Using the same kind of artificial intelligence that underpins some of the web's largest sites, it instantly mines this data and spits out recommendations. It's a bit like Amazon.com recommending purchases based on its massive trove of data about what people have bought in the past.