National Provider Identifier for Jun. 2005

Between May 23, 2005 and January 02, 2006 CMS claims processing systems will accept an existing legacy Medicare number and reject, as unprocessable, any claim that includes only an National Provider Identifier (NPI).

Beginning January 03, 2006, and through October 01, 2006, CMS systems will accept an existing legacy Medicare number or an NPI as long as it is accompanied by an existing legacy Medicare number. Beginning October 02, 2006, and through May 22, 2007, CMS systems will accept an existing legacy Medicare number and/or an NPI. This will allow for 6–7 months of provider testing before only an NPI will be accepted by the Medicare Program on May 23, 2007. Beginning May 23, 2007 CMS systems will only accept an NPI.