NPI lookup
An NPI (National Provider Identifier) is a unique 10-digit number CMS assigns to every US healthcare provider and organization. This tool looks up NPIs in the official NPPES registry so you can verify a provider's number, taxonomy and enrollment status before you bill or credential.
What is an NPI number?
An NPI is a unique 10-digit identifier that CMS, through NPPES, assigns to healthcare providers in the United States. It is required on HIPAA-standard transactions - claims, eligibility and remittance - and stays with the provider for life.
NPI-1 vs NPI-2: individuals and organizations
An NPI-1 (Type 1) belongs to an individual provider such as a physician or therapist. An NPI-2 (Type 2) belongs to an organization such as a group practice, hospital or laboratory. Billing the wrong type is a common, avoidable denial.
What the taxonomy code tells you
Each NPI carries taxonomy codes that classify the provider's specialty and type. A mismatch between the taxonomy on file and the service billed is a frequent source of medical-necessity and enrollment denials.
Why verifying the NPI matters
An accurate, active NPI whose type and taxonomy match the enrollment is the anchor of a clean claim. Primary-source verification against NPPES is part of what MedXFlow's credentialing agent runs automatically during provider enrollment.
Frequently asked questions
How do I look up an NPI number?
Enter the provider's last name (and optionally first name and state), the organization name, or a known 10-digit NPI, then search. Results come from the official CMS NPPES registry and show the NPI, provider type, primary taxonomy, location and status.
Is NPI lookup free?
Yes. NPI data is public and maintained by CMS in the NPPES registry. This tool queries that registry at no cost.
What is the difference between a Type 1 and Type 2 NPI?
A Type 1 (NPI-1) is for an individual provider such as a physician or nurse practitioner. A Type 2 (NPI-2) is for an organization such as a group practice, hospital or laboratory. A provider who owns a practice can have both.
Why would a claim be denied over an NPI?
Common causes are billing under a deactivated NPI, using the wrong NPI type, or a mismatch between the provider's taxonomy or enrollment and the service billed. Verifying the NPI and taxonomy before billing prevents these denials.
How often is NPPES data updated?
CMS refreshes the NPPES registry regularly, and providers can update their own records at any time. Always confirm active enrollment with the specific payer before billing.