|The data on this site is always "fresh", up-to-date or "live". Our data feed is the actual NPPES database API published by Medicare (CMS). As a result, unlike other websites, there is no delay is data freshness. We never need to run updates because we don't rely on the NPPES download file (monthly or weekly). A National Provider Identifier or NPI is a unique 10-digit identification number issued to health care providers in the United States by the Centers for Medicare and Medicaid Services (CMS). CMS has made this data public.