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Classification 2024 Winter Edition

Worldwide source of medical classification resources

Scope of Revision of the 2024 Winter Edition

The major focus of the 2024 winter edition was the evaluation of the 2024 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 2024 vocabulary in the MeSH Browser. Additional minor updates were made to the Index and Schedules.

Summary Statistics for the NLM Classification 2024 Winter Edition

  • 10 New Class Numbers
  • 4 Modified Class Numbers
  • 41 New Index Headings – (38 from 2024 MeSH)
  • 21 Modified Index Headings
  • 2 Deleted Index Headings

Examples of Additions and Changes Based on MeSH 2024

New 2024 Headings Added to Index by Tree (and related maintenance)

Of the 311 new 2024 MeSH descriptors, only 38 were added to the NLM Classification index.  Below is the list of 2024 index terms added by MeSH tree category in addition to other relevant classification maintenance done:

Anatomy [A]

        Epicardial Adipose Tissue

Diseases [C]


        Mosquito-Borne Diseases

Chemicals and Drugs [D]

        Food Loss and Waste

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

        Postmortem Imaging 

        Forensic Imaging

        Continuous Glucose Monitoring

        Medicine, Thai Traditional (new number WB 55.T4 created for Thai traditional medicine)

        Non-Medical Prescribing

        Nicotine Replacement Therapy

        Diet, Plant-Based (Changed caption at WB 430 to Plant-based diets (General or not elsewhere classified)

                Added note: Includes dietary use of plants in health and disease

        Geriatric Anesthesia (Removed sub-index for Anesthesia under Aged;  Removed sub-index for Aged under


        Pediatric Anesthesia (Removed sub-index for Infant or child under Anesthesia; removed sub-index for

                Anesthesia under Child; ; removed sub-index for Anesthesia under Infant)


        Fluoride Treatment

Psychiatry and Psychology [F]

        Coping Skills

        Compulsive Sexual Behavior Disorder

        Lacanian Theory (Created new number WM 460.5.L1)

        Narcissistic Personality Disorder (Created new number WM 190.5.N2)

        Mental Health Teletherapy

        Dignity Therapy (Created new number WM 420.5.D5)

Phenomena and Processes [G]

        Dietary Patterns

        Angiogenesis (Created new number WG 502)

Disciplines and Occupations [H]

        Immunoinformatics (Created new number QW 526.5)

        Cardio-Oncology (Created new number WG 470)

        Acute Care Surgery

        Disaster Nursing (Removed Nursing sub-index under Disasters)

Anthropology, Education, Sociology, and Social Phenomena [I]

        Workforce Diversity

        Brain Drain

Information Science [L]


        Digital Health

Named Groups [M]

        Psychiatrists (Removed Biography sub-indexes under Psychiatry)

Health Care [N]

        Emergency Room Visits

        Health Services for Prisoners

        Public Health Infrastructure

        Gender-Affirming Care (changed caption at WB 395)

        Pandemic Preparedness

Publication Characteristics [V]

        Comic Book

Main Index Headings Changes Based on MeSH 2024

Of the 23 2023 MeSH descriptors that were changed, only 5 affected the NLM Classification.

2023 MESH

2024 MESH




Glycine max




Mpox (monkeypox)

Note: The following 2023 changed MeSH heading was deleted from the index:

  • Peas

Table G (Geographic Notation) Addition

The following geographic notation was added based on the new Z1 MeSH 2024 addition:


The following geographic notation was added to the Historical Geographic Locations section based on problem resolution:

        JA5-- Ancient Lands