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Table of Contents: 2026 JANUARY - FEBRUARY No. 468

NLM Classification 2026 Winter Edition Now Available

NLM Classification 2026 Winter Edition Now Available. NLM Tech Bull. 2026 Jan-Feb;(468): e4

2026 January 21 [posted]

Scope of the 2026 Winter Edition

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 Statistics for the NLM Classification 2025 Winter Edition

11 New Class Numbers
8 Modified Class Numbers
3 Modified Range Headers
27 New Index Headings – (21 from 2026 MeSH)
6 Modified Index Headings

Examples of Additions and Changes Based on MeSH 2026

New 2026 Headings Added to Index by Tree (and related maintenance)

Of the 160 new 2026 MeSH descriptors, only 21 were added to the NLM Classification index. Below is the list of 2026 index terms added by MeSH tree category in addition to other relevant classification maintenance done:

Diseases [C]

Non-Melanoma Skin Neoplasms
Omphalocele
Vestibular Migraine

Chemicals and Drugs [D]

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

Analytical, Diagnostic and Therapeutic Techniques, and Equipment [E]

Reiki

Therapeutics [E]

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

Phenomena and Processes [G]

Immunoediting, Cancer (Created new number QZ 215)
Neurodevelopment
Sex Differences
Thermal Comfort (Added to the caption at QT 165)
Transcriptome (Create new number QU 475.5

Disciplines and Occupations [H]

Glycobiology
Reverse Vaccinology

Named Groups [M]

Nursing Home Residents
Respiratory Therapists

Population Characteristics [N]

Vascular Health (Created new number WG 504)

Main Index Headings Changes Based on MeSH 2026

Of the 42 MeSH descriptors that were changed for 2026, only 11 affected the NLM Classification.

2025 MeSH	2026 MeSH
Carcinoma, Basal Cell	Basal Cell Carcinoma
Congress	Conference Proceedings
Conscious Sedation	Procedural Sedation
Consensus Development Conference	Consensus Statement
Consensus Development Conferences as Topic	Consensus Statements as Topic
Depressive Disorder, Major Dietary Patterns	Major Depressive Disorder (Deleted) use Diet
Pain, Intractable	Intractable Pain
Pain, Postoperative	Postoperative Pain
Receptors, Kainic Acid	Kainic Acid Receptors
Surgical Procedures, Colorectal	Colorectal Surgical Procedures

List of All Class Numbers Added for the 2026 Winter Edition

New Number	Class Name	Former Number(s)
QU 475.5	Transcriptome	QU 475
QV 128	Anti-Obesity agents	None
QZ 215	[Neoplasms] Immunology	QZ 200
WG 504	Vascular Health	WG 500
WQ 208.6	Surrogacy	WQ 208.5
WR 510	Skin melanoma	WR 500
WX 30	Collective nursing homes (Table-G)	WX 27
WX 30.1	[Collective nursing homes] General coverage (Not Table-G)	WX 21.7
WX 31	Individual nursing homes (Cutter from name of nursing home) (Table-G)	WX 28
WZ 23.1	[Collective academies, institutes, etc] General coverage (Not Table-G)	WZ 23
WZ 23.5	Individual academies, institutes, etc (Cutter from name of institution) (Table-G)	WZ 23

No class numbers were canceled for the 2026 Winter Edition.