The National Provider Identifier (NPI) is a 10-digit number that uniquely identifies health care providers. It will replace existing identifiers used in transactions governed by HIPAA. Obtaining an NPI does not guarantee licensure, payment, or enrollment in health plans. The goals of implementing NPIs are to simplify electronic transmission of health information and more efficiently coordinate benefits. All HIPAA-covered health care providers can apply for an NPI online, and must use only NPIs in standard transactions by May 2007. The NPI will not replace Medicare's enrollment or certification processes.