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Castlight Health, a startup that lets self-insured employers and their employees comparison shop for medical procedures, raised $100 million in Series D funding this week. That’s reportedly one of the largest venture rounds on record in health IT and could signal an IPO down the road. 

Will Castlight become the Travelocity for medicine? What’s for sure is price transparency is sorely needed when a colonoscopy can cost anywhere from $563 to $3,967 within a single zip code; and health insurance premiums rose 8 percent from 2000 to 2009. TR’s profile story from November has more details about the company’s plans. 

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