Classification 2025 Winter Edition
Worldwide source of medical classification resourcesScope of Revision of the 2025 Winter Edition
The major focus of the 2025 winter edition was the evaluation of the 2025 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 2025 vocabulary in the MeSH Browser. Additional minor updates were made to the Index and Schedules.
Summary Statistics for the NLM Classification 2025 Winter Edition
- 6 New Class Numbers
- 17 Modified Class Numbers
- 1 Modified Range Header Note
- 10 New Index Headings – (9 from 2025 MeSH)
- 50 Modified Index Headings
Examples of Additions and Changes Based on MeSH 2025
New 2025 Headings Added to Index by Tree (and related maintenance)
Of the 192 new 2025 MeSH descriptors, only 9 were added to the NLM Classification index. Below is the list of 2025 index terms added by MeSH tree category in addition to other relevant classification maintenance done:
Diseases [C]
Community-Acquired Pneumonia (Created new number WC 203)
Analytical, Diagnostic and Therapeutic Techniques, and Equipment [E]
Onco-anesthesia (Created new number QZ 271)
Portable X-Ray
Surgical Procedures, Colorectal
Psychiatry and Psychology [F]
Generalized Anxiety Disorder
Grief Therapy (Created new number WM 420.5.G7)
Mindfulness-Based Cognitive Therapy
Disciplines and Occupations [H]
Diving and Hyperbaric Medicine (Added to caption at WD 850)
Named Groups [M]
Opticians
Main Index Headings Changes Based on MeSH 2025
Of the 31 2025 MeSH descriptors that were changed, only 24 affected the NLM Classification.
Table G (Geographic Notation) Addition
The following geographic notation was added based on the new Z1 MeSH 2025 addition:
LK3-- Kiribati