As healthcare costs continue to rise and fluctuate based on hospitals' location, price transparency efforts will continue to be important. That's what makes San Francisco-based health IT start-up Castlight Health's Tuesday announcement that it was able to raise $100 million in Series D funding so important, according to an article published in Forbes. Castlight offers online healthcare price-comparison tools to employees of self-insured companies. --Read the full article on FierceHealthIT