NHS Number Validator
Validate UK National Health Service (NHS) numbers. Check weights and Módulo 11 in real time.
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How NHS validation works
The validator checks if the input is exactly 10 digits. It calculates the weighted sum of the first 9 digits using weights from 10 to 2.
If the division remainder indicates a check digit of 10, the number is rejected as invalid. A remainder of 11 maps to check digit 0, and other values must match the 10th digit.