During the online enrollment process, organizations cannot affiliate individuals to their group. It is the responsibility of the individual provider to affiliate with a group. The request must be on the business letterhead to include the Group’s Medicaid Legacy ID number and the provider’s NPI number with the provider’s or an authorized signature via Fax: (803) 870-9022 or Mail: Medicaid Provider Enrollment, PO Box 8809 Columbia, SC 29202-8809. Updates will be processed within ten (10) days of receipt.