What Is an NPI Number and Why Does It Matter?
March 26, 2026
If you've ever filled out insurance paperwork or received an explanation of benefits, you've likely seen the term "NPI number." NPI stands for National Provider Identifier — a unique 10-digit identification number assigned to every healthcare provider in the United States.
Why the NPI System Was Created
Before the NPI, the U.S. healthcare system used a patchwork of different identification numbers — Medicare provider numbers, Medicaid numbers, and countless insurer-specific IDs. The Health Insurance Portability and Accountability Act (HIPAA) mandated a single, universal identifier, and the NPI was the result. It went into effect in 2006 and has been the standard ever since.
Who Gets an NPI?
Any healthcare provider who transmits health information electronically is required to obtain an NPI. This includes physicians, nurses, dentists, pharmacists, physical therapists, chiropractors, and thousands of other provider types. Organizations like hospitals and group practices receive their own NPI separate from the individual providers who work there.
NPI numbers come in two types: Type 1 (for individual providers like doctors and nurses) and Type 2 (for organizations like hospitals and group practices). You can browse both on DoctorDataHub — individual providers make up the majority of the searchable registry.
What Can You Do With an NPI Number?
Knowing a provider's NPI lets you verify their identity, check their listed specialty, and confirm their practice location. It's especially useful for patients who want to double-check a referral, billing departments resolving insurance claims, and researchers studying the healthcare workforce. You can search any NPI on DoctorDataHub or browse by specialty and state.