This Go 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.
Transparency Market Research has issued a prediction that the healthcare API market will reach $243 million by the year 2024. However, it also said the size of the same market was $162M in 2015 (after the first decade of the API economy) which means only 50% decade over decade growth.