NPI Validator
Validate USA National Provider Identifiers. Verifies virtual-prefix Luhn checks in real time.
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How NPI validation works
The validator checks if the input is exactly 10 digits. It then prepends the virtual country code prefix '80840' to form a 15-digit calculation base.
It performs the standard Luhn Módulo 10 algorithm over these 15 digits. If the final sum modulo 10 equals zero, the identifier is mathematically correct.