Medicare provider utilization and payment data (which is a large percentage of the total market in the United States) has been publicly available[1] for several years now. The
Wall Street Journal won a Pulitzer Prize[2] for the analysis they did of the public data sets.
[1]: http://graphics.wsj.com/medicare-billing/
[2]: https://www.wsj.com/articles/wsj-new-york-times-win-pulitzer...