0xx Fields

Contents   Fixed field   Access points   0xx   1xx   2xx   3xx   4xx   5xx   6xx   7xx   8xx   9xx   Control subfields

096  Locally Assigned NLM-type Call Number (R)

Record Type


Input Standards

Field (Full/Minimal)
1st Indicator  Undefined
blank character Undefined
2nd Indicator  Undefined
blank character Undefined
Subfields (R=Repeatable  NR=Nonrepeatable) Input Standards (Full/Minimal)
ǂa Classification number (NR) Mandatory/Mandatory
ǂb Item number (NR) Optional/Optional
ǂe Feature heading (NR) Optional/Optional
ǂf Filing suffix (NR) Optional/Optional


Call numbers based on National Library of Medicine (NLM) or Library of Congress (LC) classification schedules and assigned by any library other than NLM. Field 096 is not part of the standard MARC 21 Bibliographic format. If you use LC classification for all materials, use field 050 or field 090.


If you are transcribing LC or NLM copy, use field 060 for the NLM-assigned call number. Field 096 is not retained in the WorldCat record if field 060 contains a call number. Field 096 is retained in exported records and records delivered via other services.

If you assign a National Library of Medicine classification number according to the NLM class schedules, prefer field 060 with 1st indicator blank, 2nd indicator 4. If the classification portion of your number does not conform to the NLM class schedules, use field 099.

Multiple call numbers

Certain classification choices are recognized to be local decisions. Multiple call numbers in the same classification scheme in a WorldCat record may be appropriate under certain circumstances. For more information, see 050-099 Introduction to Call Numbers.

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



ǂa Classification number

The class number portion or the complete call number. Enter spaces in the NLM call number to conform to NLM formatting practice. Enter one space to indicate each new line needed in label displays.

096     WQ18
ǂb Item number

The item number portion of the NLM call number. You may enter the complete call number in subfield ǂa instead.

Your use of subfield ǂb in the 060 and 096 fields affects the processing and use of OCLC-MARC records.

The National Library of Medicine (NLM) uses the Cutter-Sanborn Three Figure Author Table (1969) when assigning Cutter numbers, although NLM supplies cutter numbers only for material shelved in their reference or History of Medicine collection. OCLC recommends that health science libraries consider using this same table for assigning Cutter numbers.

096     W 90 ǂb +G552 1991
ǂe Feature heading

A feature heading from a classified catalog. Data in subfield ǂe display in label displays as if they were in subfield ǂb.

096     WT 5 ǂb C61 2001 ǂe 17:4
ǂf Filing suffix

A filing suffix from a classified catalog. Data in subfield ǂf display in label displays as if they were in subfield ǂb.

096     WL106 ǂb 1904 ǂf A16i


For indexing and searching information, see Searching WorldCat Indexes, field 096.


Field 096 is OCLC-defined and therefore not included in MARC 21 Format for Bibliographic Data.

This page last revised: January 7, 2021