NPI Number vs. Tax ID (TIN/EIN): What's the Difference?
September 04, 2026Learn the difference between an NPI, TIN, EIN and SSN, how each identifies a provider or taxpayer, and how NPI and tax ID information is used in healthcare billing.
Billing Provider NPI vs. Rendering Provider NPI: What's the Difference?
September 03, 2026Learn the difference between billing and rendering provider NPIs, where each appears on the CMS-1500 and 837P claim, and when the NPIs may be the same or different.
How to Look Up an NPI Number
September 03, 2026Learn how to look up an NPI number by provider name, organization, location or NPI and understand the provider information returned in an NPI search.
NPI Type 1 vs. Type 2: What's the Difference?
September 02, 2026Learn the difference between Type 1 and Type 2 NPIs, including individual providers, healthcare organizations, sole proprietors and organization subparts.
What Is an NPI Number? Complete Guide to National Provider Identifiers
May 01, 2020 Revised: September 02, 2026Learn what an NPI number is, who needs one, how NPIs are used in healthcare claims, and how to look up and validate a National Provider Identifier.