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United States National Library of Medicine National Institutes of Health

FAQ: Added or Changed NLM Classification Numbers

Question: Has NLM added or changed any NLM classification numbers since the last edition of the NLM classification scheme?

The online National Library of Medicine Classification, is available at Beginning with the 2002 edition, the National Library of Medicine Classification is published in electronic form and updated annually.

To see the changes go to Scope of Revision at

Additions and changes to the NLM classification scheme are announced on an irregular basis in the NLM Technical Bulletin at

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Last reviewed: 15 July 2008
Last updated: 15 July 2008
First published: 01 January 1998
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