CELEX number of EUR-Lex documents

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What is a CELEX number?

The CELEX number is a unique identifier for every document in EUR-Lex – regardless of language.

Learning how to read a CELEX number will help you search faster and understand how documents are related.

It has 4 parts:

Illustration of the composition of the CELEX number: It is composed of 4 parts - one digit for the sector, four digits for the year, one or two letters for the type of document and usually 4 digits for the number of document

Exceptions: Some documents, such as treaty protocols or declarations have a slightly different CELEX structure. For more information, see how CELEX numbers are composed (available in English only, last updated 04/2017).


Documents on EUR-Lex are classified into 12 sectors.


    • 1Treaties
    • 2International agreements
    • 3Legislation
    • 4Complementary legislation
    • 5Preparatory acts
    • 6Case-law
    • 7National transposition measures
    • 8References to national case-law concerning EU law
    • 9Parliamentary questions
    • 0Consolidated legislation
    • COther documents published in the Official Journal C series
    • EEFTA documents

Document type

Each document type has a descriptor.

Descriptors can have one or two letters.

Full list of descriptors

Some common descriptors:

  • Sector 3 - Legislation

    • Lfor Directives
    • Rfor Regulations
    • Dfor Decisions
  • Sector 6 - Case-law

    • CJfor Judgments by Court of Justice
    • CCfor Opinions of the advocate-general
    • COfor Orders of the Court of Justice.
  • Sector 5 - Preparatory documents

    • PCfor Legislative proposals by the Commission (COM documents), etc.
    • DCfor other COM documents (green and white papers, communications, reports...)
    • SCfor SWD documents (staff working documents, impact assessments...)
    • JCfor JOIN documents (adopted jointly by the Commission and the High Representative)


Treaties (sector 1)

There are 3 digits after the descriptor.

They indicate the number of an article of Treaty.

For example:

11957E086 is the number for Article 86 of the EEC treaty (1957).

Consolidated versions of treaties

These are indicated by year of consolidation, e.g.

Treaty on the Functioning of the European Union:

12016E – table of contents, consolidated version 2016

12016E/TXT – consolidated version 2016

12016E003 – Article 3, consolidated version 2016

International agreements (sector 2)

These are identified by publication date.

So the international agreement No. 22006A1230(03) was published in the Official Journal on 30 December 2006.

If several agreements are published on the same day, only the number in brackets changes: e.g. 22006A1230(01)

Case-law (sector 6)

Number is based on the case number issued by the Court of Justice.

The year is the year in which the case entered the Court’s register.

For example:


This is the judgment in the 201st case entered in the register in 2004.

The case number is T-201/04.


Corrigenda have the same number as the document they are amending, with R(xx) added at the end (xx being the number of the corrigendum).

For example:

32009L0164R(01) is the first corrigendum to Directive 32009L0164.

A corrigendum may relate to one or more language versions – or even all of them.

Consolidated legislation (sector 0)

Consolidated legislation has the same number as the basic act – but its sector is ‘0’ instead of ‘3’.

It is followed by the date of entry into force of the last amendment to the act (see our FAQ on consolidation). For example: 02009L0156-20161018.