NPI Luhn Check Digit Calculation

If you need to make up a fake NPI, you can’t just throw any 10 digits together and have it wind up as a valid NPI. NPI for those who don’t know is National Provider Identifier. You probably know that if you’re looking for a way to generate them though. The first digit has to be one or two and the last digit is actually a check digit of the rest of the digits plus a prefix that’s applied to the NPI to make a different...

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