National Provider Identifier (NPI) Number

Online NPI Application
Printable NPI Application

On May 1, 2006, the Centers for Medicare & Medicaid Services (CMS) introduced the revised CMS 855 Medicare provider enrollment applications. As part of the revised enrollment process, initial enrollees and existing enrollees making changes to their enrollment information must include their National Provider Identifier (NPI) number and a copy of the National Plan and Provider Enumeration System (NPPES) NPI notification with the enrollment application. No initial application can be approved and no updates to existing enrollment information can be made without this NPI information. All health care providers and suppliers who bill Medicare are required to obtain their NPI in advance of enrolling in or changing their Medicare enrollment data.

If you are an individual or sole proprietor, who furnishes health care, you are eligible for one and only one NPI. If you are an individual who is a health care provider and who is incorporated, you may need to obtain an NPI for yourself and an NPI for your corporation or LLC. If you are an organization that furnishes health care, you may determine that you have components, called “subparts,” that need their own NPI. For additional information about the NPI, please go to

If you have not yet obtained your NPI number, CMS encourages you to do so soon even if you are not enrolling or making a change to your Medicare enrollment information. Attached is an information sheet designed to provide basic information about the NPI, including the three different ways to apply for your NPI. Whatever method you use to obtain your NPI, be sure to keep this information, share it with your health care partners, and update your information with NPPES whenever any of the information used to get your NPI changes.

Starting May 23, 2007, the NPI will replace all of your existing provider numbers that you use to bill Medicare, Medicaid, and other health care payers. Although this date is still a year away, you should begin sharing this information with Medicare, other payers, and your other health care partners in order to make the transition to NPI as smooth as possible.

For more information about the revised provider enrollment process, please contact your Medicare contractor or go to


The Centers for Medicare & Medicaid Services announces the following plans for transitioning to the National Provider Identifier (NPI) in the Fee-for Service Medicare Program:

Between May 23, 2005 and January 2, 2006, CMS claims processing systems will accept an existing legacy Medicare number and reject, as unprocessable, any claim that includes only an NPI.

Beginning January 3, 2006, and through October 1, 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 2, 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, systems will only accept an NPI .

For additional information, to complete an NPI application online, and to access educational tools, visit on the web.