How to verify a provider's NPI

Verifying an NPI means more than confirming it’s ten digits — it means confirming the number belongs to a real, active provider whose details match what you expect. Getting this wrong leads to denied claims, failed credentialing, and compliance gaps.

Validity vs. verification

There are two separate checks:

• Validity — is it a well-formed NPI? Ten digits that pass the Luhn check digit. This catches typos but proves nothing about the provider.
• Verification — does it map to an active provider in NPPES whose name, type, specialty, and location match? This is the check that matters.

What to confirm

Field	What to check
Name	Matches the individual or organization you expect
Entity type	Type 1 (person) vs Type 2 (organization) is correct
Primary taxonomy	The specialty is consistent with the service
Practice address	Current and in the expected location
Status	Active — not deactivated

Where to verify

The authoritative source is the official NPPES registry at npiregistry.cms.hhs.gov. For a faster check, look up the NPI on drfind — paste the 10-digit number and you’ll get the matching record, with the specialty already decoded. (See how to read the record for what each field means.)

Verifying at scale

If you’re checking dozens or thousands of NPIs — a typical billing or credentialing job — manual lookups don’t work. See bulk NPI validation for the approach.