An organization under contract with the Department of Health and Human Services to assign NPIs. The enumerator will: receive and process National Provider Identifier (NPI) applications; notify health care providers of their NPIs; use the National Plan and Provider System (NPPES) to ensure the unique identification of a health care provider; answer questions about the processes of applying for and obtaining NPIs and furnishing updates; collect information, via the applications and updates, and maintain the NPPES database containing NPIs and information about the health care providers to which they are assigned; and furnish information upon request and in accordance with established guidelines.