Editing National identification number (section)

=== Bulgaria ===
{{Main|Uniform civil number}}

Every citizen or permanent resident of [[Bulgaria]] has a unique 10-digit ''Uniform Civil Number'' ({{langx|bg|Единен граждански номер|Edinen grazhdanski nomer}}, usually abbreviated as ЕГН, ''EGN''), generated from the person's [[date of birth]] (encoded in six digits in the form YYMMDD), followed by a three-digit serial number and a single-digit [[checksum]]. The last digit of serial number indicates gender: odd numbers are used for females and even numbers for males.

For persons born prior to 1900, the month identifier (third and fourth digits) is increased by 20 (e.g. 952324XXXX denotes a person born on 24 March 1895). Similarly, 40 is added to denote that a person was born after 1999 (e.g. 054907XXXX denotes a person born on 7 September 2005).

EGNs were introduced in 1977 and are used in virtually all dealings with public service agencies, and often with private businesses. EGNs are also printed on Bulgarian identity cards and passports, under the heading "ЕГН/Personal number".