Under the federal Affordable Care Act, physicians and other providers have only 60 days to refund overpayments to the Medicare program before they face potential liability under the False Claims Act.  In addition, if CMS or the Medicare Area Contractor (MAC) identifies an overpayment, physicians have a limited period of time to respond or reply to the overpayment demand before CMS begins to recoup the overpayment.  A useful tool for understanding this process is this recently revised Medicare Learning on Medicare Overpayments.