CMS is hosting a Special Open Door Forum May 19, 2010 to discuss a variety of Medicare provider enrollment issues. Topics to be covered include: CMS’s May 5, 2010 interim final rule on Medicare/Medicaid provider and supplier enrollment, ordering and referring, and documentation requirements; and changes in provider agreements; internet-based Provider Enrollment, Chain and Ownership System (PECOS); pharmacy accreditation issues; advanced diagnostic imaging accreditation; provider and supplier reporting responsibilities; and revalidation efforts.