I have found a good guide specifically for Costa Rica Medical Tourism that updates regularly at http://www.healthcheckcostarica.com and has a lot of independent articles and reviews from respected outside sources. Hope this helps.
I am a big supporter of community powered information. So check out the following Health Tourist Guide
This is written by one of our team members at Medtrawell and is purely powered by user generated advice, so as and when people add more advice we keep updating it. You are welcome to use it for free.