I'm the CEO and cofounder of drchrono
If you are a great hacker and are interested in healthcare I dare you to build on drchrono's API!!!
Sign up here: https://drchrono.com/api
Once you put in an API request you can create a free drchrono account here: https://drchrono.com (yeah, go through all 3 steps to create an account, it's called a funnel)
Then email me your username at firstname.lastname@example.org and I can turn your account on for API access. Mention you signed up via StackOverflow for expedited API access.