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“This is low-hanging fruit when it comes to combating fraud and I am committed to ensuring oversight of CMS and demanding they take action,” he wrote.

Often, states didn’t even know how to use the waste-busting tool. The inspector general’s final recommendation is for CMS to give states more guidance in how to use Interstate Match, which CMS agreed to in a letter.

When asked for comment Monday, CMS deferred to its response in the report, which said, “[W]e appreciate the opportunity to comment on this draft report and look forward to working with OIG on this and other issues.”

Medicaid, which funds healthcare for Americans with incomes near or below the federal poverty level, is one of the most targeted government institutions for fraud. The Government Accountability Office estimates that $14.4 billion in Medicaid payments, or nearly 6 percent of the amount spent last year, were improper.