National library of medicine classification scheme

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Classification 2024 Winter Edition

Worldwide source of medical classification resources

A product of the National Library of Medicine for the arrangement of library materials in the field of medicine and related sciences used internationally.

• NLM Policy on Classification
• Scope of Revision of the 2024 Winter Edition
• Class Numbers Added and Canceled (Current Edition)
• Class Numbers Added (Cumulative List)
• Canceled Class Numbers (Cumulative List)

NLM Classification Materials

• Outline of the NLM Classification
• Table G (geographic notation)
• Table G Practices
• 19th Century Schedule
• Fundamentals of the NLM Classification [online training]

Other NLM Resources

• NLM Cataloging Section homepage
• NLM Catalog or LocatorPlus
• MeSH Browser