NPI (National Provider Identifier) Checksum Validator
Validate 10-digit US NPI numbers using the official Modulo 10 Luhn algorithm with constant 80840 prefix.
Sample NPIs:
Invalid NPI Checksum
Invalid NPI Luhn check digit.
Formatted NPI: 123-456-7893
FAQ
Frequently Asked Questions
Everything you need to know about this tool
An NPI is a unique 10-digit identification number issued by CMS (Centers for Medicare & Medicaid Services) for healthcare providers in the United States under HIPAA regulations.
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