The Centers for Medicare & Medicaid Services is seeking $9.2 million from the state of Maine, claiming it overbilled the agency for treating Medicaid enrollees, according to a new report by the Office of Inspector General. Maine pegged its reimbursements to an incorrect payment rate between 2005 and 2009, the OIG noted, and used the incorrect rate for about 90 percent of the more than 637,000 claims it reviewed. Maine officials say they are negotiating with the feds for a lower settlement amount, noting the state likely also underbilled for many procedures. Report (.pdf)