New online tool gives patients insight into the cost of medical care

Buying health care in America is like shopping blindfolded at Macy's and getting the bill months after you leave the store, economist Uwe Reinhardt likes to say. A tool that went online Wednesday is supposed to give patients a small peek at the products and prices before they open their wallets. Got a sore knee? Having a baby? Need a primary-care doctor? Shopping for an MRI scan? Guroo.com shows the average local cost for 70 common diagnoses and medical tests in most states. That's the real cost — not "charges" that often get marked down — based on a giant database of what insurance companies actually pay.