Informing the National Supplier Clearinghouse (NSC) of the Identity of the

40.22 - Informing the National Supplier Clearinghouse (NSC) of the Identity of the Opt-Out Physicians or Practitioners (Rev. 160, Issued: 10-26-12, Effective: 01-28-13, Implementation: 01-28-13) The Medicare contractor must notify the NSC directly with timely information on physicians or practitioners who have opted out of Medicare. An Internet Web site “Home Page” is not an acceptable means of notifying the NSC. The NSC’s address is as follows: National Supplier Clearinghouse P.O. Box 100142 Columbia, SC 29202-3142