This PHP Sample Source Code is athenahealth's More Disruption Please API samples. The libraries are used to help facilitate access to the API. Each package has a naive implementation of using the API, as well as a library and a testing script to use that library.
There are a lot of opportunities for developers in the healthcare space, but accessing the data needed to drive those applications can be maddeningly frustrating. There are no shortage of electronic medical record (EMR) systems, but they all have their own proprietary interfaces.