A National Provider Identifier (NPI) is a 10-digit identification number issued to all covered health care providers by CMS and a HIPPA Simplification Standard. NPIs are assigned in two forms – at the individual practitioner level or at the group level. Some provider service groups or practices may have several NPIs depending on the organizations’ structure.

Covered health care providers, all health plans and all health clearinghouses must use NPI numbers in financial and administrative transactions.