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  1. Understanding NPI, Tax ID and Taxonomy Codes - ABABilling.net

  2. Understanding Your NPI and Tax Ids - National Provider Identifier

  3. Decoding Tax ID and NPI: A Simplified Guide

  4. National Provider Identifier Standard (NPI) | CMS

  5. Understanding your NPI and Tax ID - NPI Search Engine

  6. Figuring Out Your Tax ID and NPI Information