ASHINGTON — It looked like the watchdog had found something big — in December 2017, a government report proclaimed that drug companies might have stiffed Medicaid over a billion dollars by pricing some brand-name drugs like generics.

The report didn’t name those companies, but Mylan, maker of EpiPen, landed in hot water for similar behavior the year before. In August 2017, the company paid a $465 million settlement, facilitated by the Department of Justice, and agreed to have its pricing practices reviewed in order to resolve claims that it overcharged Medicaid for EpiPen.

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