![[Stable]](figures/lifecycle-stable.svg?package=epidm&version=1.0.4)
Check if NHS numbers are valid based on the checksum algorithm
This uses the first 9 digits, multiplied by 10 down to 2 eg digit 1x10, d2x9
The sum of the products of the first 9 digits are divided by 11
The remainder is checked against the 10th digit
Where the remainder is 11, it is replaced with 0