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2007 Apr 18
2
Checking validity of NHS numbers
Hello
I need to check that the NHS numbers in my database are valid. I''m
storing them as ten-digit strings: the first nine are the identifier and
the tenth is a check digit.
There are four steps to calculating the check digit (from
http://www.connectingforhealth.nhs.uk/systemsandservices/nsts/docs/tech_nn_check_digit.pdf):
1. multiply each of the first nine digits by a weighting factor