How to Validate your medical providers NPI numbers

Copy the following link and add it to the above Google Search to pull up this website in a new window: barrydebruin.com/php.npi/ to validate your medical providers National Provider Identifier (NPI) number. This is also helpful to validate Referring Provider NPI#'s.

If for any reason you do not have access to the internet and you need to validate the NPI# manually you can follow the following steps:

NPI #'s are generated using the Luhn formula so that the final digit can be derived by performing mathematical operations on the first 9.

NPI Check Digit Calculation:
The NPI # format consists of ten digits (9 numerics followed by 1 numeric check digit). The National Provider Identifier check digit is calculated using the Luhn formula. Example of Check Digit Calculation for NPI: Assume the 9-position identifier part of the NPI# is 123456789. Using the Luhn formula on the identifier portion, the check digit is calculated as shown below. NPI # without the check digit: 1 2 3 4 5 6 7 8 9
Step 1:
Double the value of alternate digits, beginning with the rightmost digit. Therefore, you would start with the first digit and double every other number.2 6 10 14 18
Step 2:
Add 24, plus the individual digits of products of doubling (shown in blue from step 1), plus unaffected digits from the original NPI.
24 + 2 + 2 + 6 + 4 + 1 + 0 + 6 + 1 + 4 + 8 + 1 + 8 = 67
Step 3:
Subtract the final product (from step 2) from the next higher number ending in zero.
70 – 67 = 3Check digit = 3NPI with check digit = 1234567893

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