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National identification number
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=== Sweden === {{Main|Personal identity number (Sweden)}} In [[Sweden]] a ''Personal Identity Number'' ({{langx|sv|personnummer}}) is used in dealings with public agencies, from health care to the tax authorities. It appears on all approved identity documents. It is also used as a customer code by some companies like banks and insurance companies. The number is considered extra important to protect by the Swedish data protection authority, requiring it to be clearly motivated by the nature of the service or explicit consent to register it.<ref>{{cite web |title=Sensitive personal data |url=https://www.datainspektionen.se/other-lang/in-english/the-general-data-protection-regulation-gdpr/sensitive-personal-data/ |website=datainspektionen.se |publisher=Swedish Data Protection Agency - Datainspektionen |access-date=11 May 2020 |ref=datainspektionen-sensitive-data |archive-date=14 August 2020 |archive-url=https://web.archive.org/web/20200814012504/https://www.datainspektionen.se/other-lang/in-english/the-general-data-protection-regulation-gdpr/sensitive-personal-data/ |url-status=live }}</ref> The number uses ten digits, YYMMDD-NNGC. The first six approximate the birth date in YYMMDD format; for individuals with an unknown birth date or those born on days where there aren't any unique numbers left a date close to the birth date may be used. Digits seven to nine (NNG) are used to make the number unique, where digit nine (G) is odd for men and even for women. For numbers issued before 1990, the seventh and eighth digit identify the Swedish [[Counties of Sweden|county]] of birth, with different digits for foreign-born people, but privacy-related criticism caused this system to be abandoned for new numbers. The tenth digit (C) is created using the [[Luhn algorithm|Luhn]], or "mod 10", checksum algorithm. Temporary residents or other people with temporary dealings with authorities get a "coordination number" which has 60 added to the date. Registration numbers of Swedish corporations and other legal entities follow the same ten-digit format, but are not based on dates.
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