Guides
Plain-language explainers on NPIs, the NPPES registry, and provider taxonomy. NPI Central builds every guide on the same public data that powers the search.
What Is an NPI Number?
An NPI is the 10-digit National Provider Identifier every U.S. healthcare provider uses in HIPAA transactions. Learn what it is, who needs one, and how to look one up.
Read guideHow to Look Up an NPI by Provider Name
Step-by-step guide to finding a provider's NPI number by name, including tips for common names, organizations, and narrowing by specialty or state.
Read guideType 1 vs Type 2 NPI: Individuals vs Organizations
NPIs come in two types: Type 1 for individual providers and Type 2 for organizations. Learn the difference, when a provider needs both, and how subparts work.
Read guideHealthcare Provider Taxonomy Codes Explained
Taxonomy codes classify a provider's specialty in NPPES. Learn how the 10-character NUCC code is structured, how it maps to specialties, and how to search by it.
Read guideNPI vs DEA Number vs Medicare PTAN
Providers carry several identifiers. Learn how the NPI, DEA registration number, and Medicare PTAN differ — what each is for and when each is used.
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