Medicare Ordering/Referring Claims Denials to Take Effect May 1 Medicare will begin denying claims on May 1, 2013, if the ordering/referring provider listed on the claim is not in the Provider Enrollment, Chain and Ownership System (PECOS), the database Medicare uses to track physicians and other providers. March 27, 2013 Medicare, Payment, Physician Resource Medicare, Medicare ordering/referring, CMS-855o, PECOS 0 0 Comment Read More »