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  2. DUNS Number vs. EIN: Does My Business Actually Need ... - AOL

    www.aol.com/duns-number-vs-ein-does-135700742.html

    Dun & Bradstreet offers every business one free, permanent DUNS (Data Universal Numbering System) number to build its financial credibility. While not legally required, this nine-digit identifier ...

  3. National Provider Identifier - Wikipedia

    en.wikipedia.org/wiki/National_Provider_Identifier

    A National Provider Identifier (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). The NPI has replaced the Unique Physician Identification Number (UPIN) as the required identifier for Medicare services, and is used by other payers ...

  4. Employer Identification Number - Wikipedia

    en.wikipedia.org/wiki/Employer_Identification_Number

    The Employer Identification Number (EIN), also known as the Federal Employer Identification Number (FEIN) or the Federal Tax Identification Number (FTIN), is a unique nine-digit number assigned by the Internal Revenue Service (IRS) to business entities operating in the United States for the purposes of identification.

  5. Data Universal Numbering System - Wikipedia

    en.wikipedia.org/wiki/Data_Universal_Numbering...

    The Data Universal Numbering System, abbreviated as DUNS or D-U-N-S, is a proprietary system developed and managed by Dun & Bradstreet (D&B) that assigns a unique numeric identifier, referred to as a "DUNS number" to a single business entity. It was introduced in 1963 to support D&B's credit reporting practice.

  6. Organizationally unique identifier - Wikipedia

    en.wikipedia.org/wiki/Organizationally_unique...

    An organizationally unique identifier (OUI) is a 24-bit number that uniquely identifies a vendor, manufacturer, or other organization. OUIs are purchased from the Institute of Electrical and Electronics Engineers (IEEE) Registration Authority by the assignee (IEEE term for the vendor, manufacturer, or other organization). Only assignment from ...

  7. Taxpayer Identification Number - Wikipedia

    en.wikipedia.org/wiki/Taxpayer_Identification_Number

    Any government-provided number that can be used in the US as a unique identifier when interacting with the IRS is a TIN, though none of them are referred to exclusively as a Taxpayer Identification Number. A TIN may be: a Social Security number (SSN) an Individual Taxpayer Identification Number (ITIN)