National Provider Identifier (NPI)

The National Provider Identifier, or NPI, is a 10-digit intelligence free number that will be required of all covered entities as of May 23, 2007. A covered entity is a provider who submits claims electronically in a HIPAA compliant format. The NPI is intended to improve efficiency and effectiveness of the health care system by reducing the number of identifiers associated with providers and facilities.
This tutorial provided by the Centers for Medicare & Medicaid Services (CMS) will walk you through the steps of completing an NPI application.
National Plan and Provider Enumeration System