An NPI is a National Provider Identifier: a 10-digit number that identifies a single healthcare provider or organization in every electronic transaction in US healthcare. CMS assigns it once, for free, through a system called NPPES, and it stays with the provider for life, through every job change, move, and name change.
If a claim gets billed, a prescription gets routed, or a referral gets logged, an NPI is on it. That makes the NPI the closest thing US healthcare has to a universal ID, and it is entirely public.
What an NPI is used for
The NPI exists because HIPAA required one standard identifier for electronic healthcare transactions. In practice it shows up everywhere:
- Claims. Every claim names the provider who rendered the care and the entity billing for it, each by NPI.
- Prescriptions. E-prescribing networks route scripts by prescriber NPI.
- Credentialing and enrollment. Payers, hospitals, and Medicare all key their records to it.
- Directories and data. Public datasets from CMS, from enrollment to prescribing to procedure volumes, all join on NPI. That is the foundation NPivot is built on.
Who needs an NPI
Any provider or organization that transmits health information electronically is required to have one, and in practice that means nearly everyone who bills insurance: physicians, nurse practitioners, physician assistants, therapists, dentists, pharmacists, group practices, hospitals, labs, and pharmacies. Individuals get a Type 1 NPI, organizations get a Type 2, and many clinicians are connected to both.
Is an NPI number public?
Yes. The NPI registry is a public record. For any number you can see the provider's name and credential, their specialty (as a taxonomy code), a practice address and phone on file, and the dates the record was created and last updated. What you cannot see in the registry: whether the provider is licensed, or whether their Medicare enrollment is active. Those are separate facts that many people wrongly assume an NPI proves.
How to look up an NPI
You have two free options. CMS runs the official NPPES registry search. Or use NPivot's free NPI lookup, which searches the same registry live, by name or number, and is more forgiving with hyphenated, changed, and hard-to-spell names. No login either way.
Three facts people get wrong
- An NPI never expires and is never reassigned. A number can be deactivated, after retirement or death for example, but it is never given to someone else.
- An NPI is not a license and not an enrollment. It proves identity, nothing more. Verifying a license means the state board; verifying Medicare standing means PECOS.
- The number checks itself. The tenth digit is a check digit computed with the same Luhn formula used on credit card numbers, with a healthcare prefix (80840). That is why a mistyped NPI usually fails instantly instead of matching the wrong person.
Check any provider right now. The free NPivot NPI lookup searches the registry by name or number, no login required. A free account adds Medicare enrollment, prescribing, procedure volumes, and revalidation dates on one page.