DrChrono’s founders Michael Nusimow and Daniel Kivatinos

Health care is a massive market opportunity for any developer — and yet, only about 1.3 percent of the APIs on ProgrammableWeb are associated with clinical services.

This number is set to increase in the near future, with federal regulators removing barriers to medical app innovation. In late September, the Food and Drug Administration (FDA) released a final guidance on how it plans to regulate thousands of mobile health apps. This decision opened the floodgates for developers, who no longer had reason to fear that the feds would crack down on their health-related apps.

The FDA’s move has also prompted health startups to take a more open and platform-based approach. In Mountain View. Calif, a company called DrChrono announced today that it has opened up its API, so developers can take advantage of its massive network of 53,000 physicians and 2.6 million patients.

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