One of the often overlooked requirements in the federal Affordable Care Act is that healthcare providers now have an obligation to refund overpayments to the Medicare within 60 days of discovery. Failing to do so may expose a provider to liability under the federal False Claims Act and possible exclusion from the Medicare program. Late last week, the Department of Justice elected to join a whistleblower lawsuit based on this very provision. According to an article on law360.com, this suit, which alleges that Mount Sinai Health System in New York failed to return Medicaid overpayments within 60 days of identifying them, is one of the first to apply this new provision. Stay tuned for more on this important case.