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NLM Classification Updated, April 23, 2009

The online National Library of Medicine Classification, available at, has been issued in a newly revised edition as of April 23, 2009.

Seventeen new class numbers were added to the main schedules and four new class numbers were added to the 19th Century schedule ( One class number was canceled. Eighty-one MeSH terms were added to the index, including 34 new to the MeSH vocabulary as of 2009; in addition, 71 schedule records and 580 index entries were updated since the 2008 edition was published on April 24, 2008.

Contact NLM for further information, questions, or comments.