The National Provider Identifier (NPI) is a Health Insurance Portability and Accountability Act (HIPAA) Administrative Simplification Standard. The NPI is a unique identification number for covered health care providers. Covered health care providers and all health plans and health care clearinghouses must use the NPIs in the administrative and financial transactions adopted under HIPAA. The NPI must be used in lieu of legacy provider identifiers in the HIPAA standards transactions. Providers must also share their NPI with other providers, health plans, clearinghouses, and any entity that may need it for billing purposes.

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Legacy codes may include UPIN, OSCAR, Medicare, state license numbers, BlueCross, BlueShield, DEA, railroad, health plan and other numbers (not tax ID). Results may a few moments as it examines millions of records.