Providers might be seeing claims denied for Rendering Provider NPI. This is due to the rendering provider NPI not being listed on BCBSND provider file as being affiliated with the billing provider NPI, tax ID and/or the 9-digit practicing location ZIP code for the date of service submitted. You can verify the rendering provider information using The Healthcare Online Resource –THOR. To log in, go to www.thor.org/login. Access the Provider Directory application to verify the information. If you do not have access to THOR or the Provider Directory application, register for access at www.bcbsnd.com/web/providers. To make changes to the practicing location, a New Location/Business Relationship form is required. This form can be found at https://www.bcbsnd.com/web/providers/new-provider/apply. The form can be printed and mailed or submitted electronically.