NPI vs. PTAN: What's the Difference?
September 06, 2026Learn the difference between an NPI and PTAN, including who issues each identifier, how Medicare uses PTANs, and why one NPI may be associated with multiple PTANs.
Can a Provider Have More Than One NPI?
September 06, 2026Learn when a provider can have more than one NPI, including Type 1 and Type 2 NPIs, sole proprietors, organization subparts, multiple locations and specialties.
Referring, Ordering and Supervising Provider NPI Explained
September 05, 2026Learn the difference between referring, ordering and supervising provider NPIs, how these provider roles are identified on professional claims, and when they may apply.
NPI Taxonomy Codes Explained: What They Mean and How They're Used
September 05, 2026Learn what NPI taxonomy codes are, what primary and secondary taxonomy codes mean, how taxonomy describes provider type and specialty, and where to find taxonomy information.
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.