The National Provider Identifier (NPI) is a 10-digit number that uniquely identifies every healthcare provider and organization in the United States. NPIs are issued by CMS through the National Plan and Provider Enumeration System (NPPES) and never expire or change, even if a provider moves or changes specialty. Payers use NPIs to match claims to credentialed providers, which is why incorrect NPIs are among the most common causes of claim rejections.
- What is an NPI number?
- An NPI (National Provider Identifier) is a unique 10-digit identification number issued by CMS to healthcare providers in the United States. HIPAA requires it on all standard electronic healthcare transactions, including insurance claims.
- What is the difference between a Type 1 and Type 2 NPI?
- A Type 1 NPI identifies an individual provider - a physician, nurse practitioner, or therapist. A Type 2 NPI identifies an organization - a group practice, clinic, hospital, or lab. A provider who is incorporated may have both: a Type 1 for themselves and a Type 2 for their business.
- How do I look up a provider's NPI number?
- Search by provider name, organization, or NPI number in Rette's NPI lookup, which queries the CMS NPPES NPI Registry directly. Results include the provider's NPI, taxonomy (specialty), practice address, and enumeration date.
- Is NPI lookup free?
- Yes. NPI records are public data published by CMS through the NPPES registry, and Rette's NPI search is free to use without an account.
- Why do medical billers need NPI numbers?
- Claims require the rendering, referring, and billing providers' NPIs. A missing or mismatched NPI is a common cause of claim rejections and denials, so billers routinely verify NPIs and taxonomy codes before submission.