0xx Fields

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030  CODEN Designation (R)

Record Type


Input Standards

Field (Full/Minimal)
Required if applicable/Required if applicable
1st Indicator  Undefined
blank character Undefined
2nd Indicator  Undefined
blank character Undefined
Subfields (R=Repeatable  NR=Nonrepeatable) Input Standards (Full/Minimal)
ǂa CODEN (NR) Required if applicable/Required if applicable
ǂz Canceled/invalid CODEN (R) Required if applicable/Required if applicable
ǂ6 Linkage (NR) System supplied/System supplied
ǂ8 Field link and sequence number (R) Optional/Optional


Contains the CODEN designation assigned to a periodical title by the Chemical Abstracts Service. Each CODEN consists of four mnemonic letters and a fifth letter, A, B, C, or D. The sixth character, a check character, is alphabetic or numeric.


The sixth character of a CODEN is a calculated check character, either numeric, 2-9, or alphabetic, A-Z. It is used to identify and eliminate typographical errors.

When you validate a record containing field 030, the system checks the CODEN in subfield ǂa to verify that the content and length are correct and that the check character matches the calculated check character.

If there is an error in the CODEN (e.g., the CODEN is too long or too short, has an incorrect character in any position, or incorrect value in the check digit), the system displays an error message with the CODEN remaining in subfield ǂa. If you made a typographical error, correct the CODEN and validate the record again. If the error message appears again and you transcribed the CODEN exactly, the CODEN is in error. Put the CODEN in subfield ǂz.

1st Indicator

Undefined. The 1st indicator position is undefined and contains a blank.

blank character


2nd Indicator

Undefined. The 2nd indicator position is undefined and contains a blank.

blank character




Enter the entire CODEN and the check character. Do not enter spaces or punctuation (e.g., hyphens) which may appear between the fourth and fifth characters.

030     AISJB6
030     CADIDW
ǂz Canceled/invalid CODEN

Enter the number in the same form as a valid CODEN.

ǂ6 Linkage

Data that link fields when non-Latin script is entered. This subfield is system supplied and does not appear in OCLC online displays. Do not add subfield ǂ6. For more information about subfield ǂ6, see Control Subfields.

ǂ8 Field link and sequence number

For information about subfield ǂ8, see Control Subfields.


For indexing and searching information, see Searching WorldCat Indexes, field 030.


For more information, including content designator history, see MARC 21 Format for Bibliographic Data, field 030.

This page last revised: August 27, 2020