Effective May 1, 2013, Medicare contractors will activate edits that will deny claims for Medicare Part B (including imaging and lab services), DME, and Part A home health agency (HHA) services if the ordering/referring physician or other professional is not identified, is not in Medicare's enrollment records, or is not of a specialty type that may order/refer the service/item being billed. Concerns have been raised by physicians and suppliers that they could experience claims denials and delays after May 1 based on discrepancies between the names of the ordering physician on the 1500 claim form and in Medicare’s enrollment records. CMS is holding a March 20, 2013 National Provider Call to discuss these new requirements.