Hospital-based renal dialysis facilities need to stop using their hospitals' provider numbers when billing for Part B outpatient renal services. That's the message from the Centers for Medicare & Medicaid Services in a Sept. 26 program memorandum (A-03-082; http://cms.hhs.gov/manuals/pm_trans/A03082.pdf). "It is required that the assigned RDF provider number be used on the CMS-1450 billing form (or electronic equivalent)" when submitting claims for such services, CMS says. The RDF provider numbers are in the 2300-2499 series; hospital-based chronic RDFs should contact their CMS regional office if they don't already have a number. In other program memoranda, CMS: