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The $1,000-a-pill hepatitis C drug Sovaldi has become the most expensive drug for Medicare Part D, resulting in more than $3 billion in total sales last year, according to data from the federal government.

The data was released by the Centers for Medicare and Medicaid Services Monday as part of a new dashboard that allows users to see what Medicare spends its money on. Medicare is the biggest purchaser of prescription drugs in the country.

Medicare spent $140 billion on prescription drugs in 2014, up 12 percent from 2013. That includes Medicare Part D, the program's prescription drug plan, and Medicare Part B, which covers medical services such as doctors' visits.

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