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Home › Billing Glossary › National Provider Identifier (NPI)

Medical Billing Glossary

National Provider Identifier (NPI)

The unique 10-digit identifier for a healthcare provider or organization used on claims and transactions.

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Definition

A National Provider Identifier (NPI) is a unique 10-digit number that identifies a healthcare provider in standard electronic transactions. Individual clinicians hold a Type 1 NPI; organizations such as group practices hold a Type 2 NPI.

The NPI is used consistently across payers to identify who rendered and who billed for a service, and it stays with the provider rather than changing from plan to plan.

Why it matters for billing

Claims carry both a rendering and a billing NPI, and payers match them against enrollment and credentialing records. A missing, wrong, or not-yet-enrolled NPI is a straightforward but common cause of rejections and denials, which is why enrollment and NPI accuracy are checked before billing.

Related terms

Terms that come up alongside National Provider Identifier (NPI) in the revenue cycle.

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Billing that gets National Provider Identifier (NPI) right

EnVisionMD RCM handles eligibility, coding, documentation, denials and follow-up end to end — so the details behind terms like this one are managed for you, not left to chance.

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National Provider Identifier (NPI) — frequently asked questions

What is the difference between a Type 1 and Type 2 NPI?

Type 1 identifies an individual provider; Type 2 identifies an organization such as a group practice or facility.

Does the NPI change between payers?

No. The NPI is a single identifier used across payers and transactions; it does not change from one plan to another.

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