The Danish Personal Identification number (personnummer or informally Danish: CPR-nummer, Greenlandic: CPR-normu or inuup-normua) is a national identification number, which is part of the personal information stored in the Civil Registration System (Danish: Det Centrale Personregister, Greenlandic: Inunnik Qitiusumik Nalunaarsuiffik).
Any person who is a member of ATP or is required to pay tax in Denmark according to the Tax-control Law of Denmark, but is not registered in a civil register, also receives a personal identification number.
Thus, most IT systems are presumed updated to accept numbers that fail the check-digit validation.
[6] Personnummerbevis is the Danish term for the personal identification number certificate.
Today this certificate is of little use in Danish society, as it has been largely replaced by the much more versatile Sundhedskort ("Health Card"), which contains the same information and more.