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Patients are identified using a ten-digit number known as the CHI Number, [7] pronounced /ˈkaɪ/. [8] This number is normally formed using the patient's date of birth (as DDMMYY), followed by four digits: two digits randomly generated, the third digit identifying gender (odd for men, even for women) and a check digit (Modulus-11).
The remainder when dividing this number by 11 is calculated, yielding a number in the range 0–10, which would be 2 in this case. Finally, this number is subtracted from 11 to give the checksum in the range 1–11, in this case 9, which becomes the last digit of the NHS number. A checksum of 11 is represented by 0 in the final NHS number.
Scottish patients are identified using a ten-digit number known as the CHI Number. [40] These are used to uniquely identify individuals, avoiding problems such as where health records of people with similar birth dates and names may be confused, or where ambiguously spelled or abbreviated names may lead to one patient having several different ...
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