The Who, What, When, Why & How of NPI: Information for …
https://www.cms.gov/Medicare/Provider-Enrollment-and-Certification/MedicareProviderSupEnroll/downloads/EnrollmentSheet_WWWWH.pdf
WebMay 23, 2007 · The NPI is a 10-digit number that will be used to identify you to your health care partners, including all payers, in all HIPAA standard transactions. The NPI will replace the identifiers you currently use in HIPAA standard transactions that you conduct with Medicare and with other health plans.
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