NLM Classification 2026 Winter Edition Now Available

Posted by liaison on January 27th, 2026 Posted in: Partners Sharing Information

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The major focus of the 2026 winter edition was the evaluation of the 2026 MeSH (Medical Subject Headings) vocabulary for inclusion in the Classification index. Several additions and changes were made to the Index and Schedules based on this review. All main index headings are now linked to the 2026 vocabulary in the MeSH Browser. Additional minor updates were made to the Index and Schedules.

Summary of Updates

• 11 New Class Numbers
• 8 Modified Class Numbers
• 3 Modified Range Headers
• 27 New Index Headings, including 21 from 2026 MeSH
• 6 Modified Index Headings

Notably, only a select subset of the 160 new MeSH descriptors were added to the NLM Classification index. Below is a sample of 2026 index terms added by MeSH tree category in addition to other relevant classification maintenance done:

Examples of New Additions

Diseases [C]

• Non‑Melanoma Skin Neoplasms
• Omphalocele
• Vestibular Migraine

Chemicals & Drugs [D]

• Personal Care Products (Updated the range at WA 730 and the caption at WA 744)
• Royal Jelly
• Semaglutide

Therapeutics [E]

• Cognitive Enhancement
• Magnetic Particle Imaging
• Microneedle Drug Delivery
• Surrogacy (Created new number WQ 208.6)

Named Groups [M]

• Nursing Home Residents
• Respiratory Therapists

Where to Learn More

The full update is available directly through the NLM Technical Bulletin.