Editing National identification number (section)

=== United Kingdom ===
{{Main|National Insurance number}}
A [[National Insurance number]] is used to administer state benefits, but is not considered proof of identity. As it is the only number that is unique to each individual, does not change during the course of the person's lifetime, and is issued to virtually every adult throughout the UK, it is used by [[Her Majesty's Revenue and Customs|His Majesty's Revenue and Customs]] (HMRC) to track individuals for income tax purposes. The number is stylised as LL NN NN NN L, for example AA 01 23 44 B. National Insurance numbers are widely used in banking, government services and identification purposes, despite not being explicitly defined as such.

Separately, those born in the [[England]] and [[Wales]], as well as those who are registered at a GP are issued a [[NHS number|National Health Service number]], taking the form NNN-NNN-NNNN, for example 122-762-9257 (the last number being a check digit).<ref>[http://systems.hscic.gov.uk/nhsnumber/staff/guidance/gppracguide.pdf Guide] {{Webarchive|url=https://web.archive.org/web/20151021101530/http://systems.hscic.gov.uk/nhsnumber/staff/guidance/gppracguide.pdf |date=2015-10-21 }}</ref><ref>{{cite web |url=http://www.nhsia.nhs.uk/nsts/pages/digit_calc.asp |title= NHS Information Authority - NHS Strategic Tracing Service - Number Check Digit Calculation|website=www.nhsia.nhs.uk |archive-url=https://web.archive.org/web/20050405033557/http://www.nhsia.nhs.uk/nsts/pages/digit_calc.asp |archive-date=5 April 2005}}</ref> Similarly in [[Scotland]], healthcare users are issued a CHI (Community Health Index<ref>{{cite web |url=https://www.ndc.scot.nhs.uk/Dictionary-A-Z/Definitions/index.asp?ID=128&Title=CHI%20Number |title=ISD Scotland {{!}} Information Services Division |access-date=2022-01-13 |archive-date=2022-02-02 |archive-url=https://web.archive.org/web/20220202174047/https://www.ndc.scot.nhs.uk/Dictionary-A-Z/Definitions/index.asp?ID=128&Title=CHI%20Number |url-status=live }}</ref>) number, taking the form DDMMYY-NNNN, with the DDMMYY representing their date of birth and a four digit unique number thereafter (e.g. someone born on 3 February 2010 would have the number 030210-NNNN, with the four digit number allocated upon entering newborn details on to the local health board's [[patient administration system]]). The second last N is even for females and odd for males.