Who assigns NPIs to health care providers?

Answer : The Department of Health and Human Services selected Fox Systems, Inc., known as the Enumerator, does this work. In addition to receiving and processing paper National Provider Identifier (NPI) applications and updates and notifying health care providers of their NPIs, the Enumerator resolves issues related to NPI applications and updates that contain errors, investigates situations in which applications for NPIs match or closely match health care providers who already have been assigned NPIs, investigates situations in which updates are unable to match any enumerated health care provider, and operates and maintains a Call Center and an electronic mailbox in order to receive and respond to questions about obtaining NPIs.