NPI numbers need to be reported to individual insurance companies; This can be done online, by phone, or by fax.
1 Locate your provider NPI number using a free online NPI number database, such as the National Provider Indentifier database, at http://www.hmedata.com/npi.asp. Use the provider’s first and last address, state, and office to locate the NPI number.
2 Visit the website of the insurance company to use your existing login information or create an account. Enter the NPI number when prompted.
3 Provide the NPI number when calling the insurance company with claims status to expedite claims and receive reimbursement.
4 Fax to the NPI number with each fax claim form for reimbursement.