NPI Validation Tool
Enter the National Provider Identifier (NPI) Number to validate
NPI Validation Rules
The National Provider Indentifier (NPI) is 10-position all-numeric identification number assigned by the National Plan and Provider Enumeration System (NPPES) to uniquely identify a health care provider.
Characteristics of NPI numbers:
How to calculate the NPI check digit?
Take the first 9 digits of the NPI number and double the value of alternate digits beginning with the rightmost digit.
Sum the individual digits of the products resulting from step 1 to the unaffected digits from the original number and add a constant 24.
Subtract the total obtained in step 2 from the next higher number ending in zero, this is the check digit. If the number obtained in step 2 ends in zero, the check digit is zero.