Format/length:  n10 
HES item:  NEWNHSNO 
National Codes:  
Default Codes: 
Notes:
References:
UK Government Data Standards Catalogue (GDSC), Version 2.0, Agreed 01.01.02. GDSC:
http://www.govtalk.gov.uk/gdsc/html/default.htm
NHS NUMBER is the same as attribute NHS NUMBER.
It is mandatory to record the NHS NUMBER for each PATIENT. The exception to this rule is A&E care. The NHS NUMBER, the primary identifier of a PERSON, is a unique identifier for the PATIENT.
The NHS NUMBER is 10 numeric digits in length. The tenth digit is a check digit used to confirm its validity. The check digit is validated using the Modulus 11 algorithm and the use of this algorithm is mandatory. There are 5 steps in the validation of the check digit:
Step 1  Multiply each of the first nine digits by a weighting factor as follows: 
Digit Position (starting from the left) 
Factor 

1  10 
2  9 
3  8 
4  7 
5  6 
6  5 
7  4 
8  3 
9  2 
Step 2  Add the results of each multiplication together. 
Step 3  Divide the total by 11 and establish the remainder. 
Step 4  Subtract the remainder from 11 to give the check digit. If the result is 11 then a check digit of 0 is used. If the result is 10 then the NHS NUMBER is invalid and not used. 
Step 5  Check the remainder matches the check digit. If it does not, the NHS NUMBER is invalid. 
References:
NHS Strategic Tracing Service: http://nww.nhsia.nhs.uk/nsts/pages/faq.asp
UK Government Data Standards Catalogue
Data Element  NHS Number 
Is Part Of 
Person Identifiers

Has Parts  
Version  2.0 
Status  Release 
Previous Versions  
Later Versions  
Date Agreed  1 January 2002 
Meta Data  Value  
Name  NHS Number  
Description  A number used to identify a person uniquely within the NHS in England and Wales.  
Business Format  10 numeric  
Element Type  Data Item  
Validation 
Step 2 Add the results of each multiplication together. Step 3 Divide the total by 11 and establish the remainder. Step 4 Subtract the remainder from 11 to give the check digit. If the result is 11 then a check digit of 0 is used. If the result is 10 then the NHS NUMBER is invalid and not used. Step 5 Check the remainder matches the check digit. If it does not, the NHS NUMBER is invalid. 

Value  
Default Value  
Owner  Department of Health  
Based On  Department of Health  
Verification  
Comment 
This data element is also known by these names:
Context  Alias 

plural  NHS NUMBERS 