MeSH 2026 Update: Merged Medical Subject Headings from 2023-2026

datadiscovery.nlm.nih.gov provides a structured report detailing changes to the Medical Subject Headings (MeSH) vocabulary. The dataset describes cases where two or more terms have merged into a single term, with coverage from 2023 to 2026. It was last updated on February 10, 2026.

Use Cases

• Track vocabulary evolution by analyzing MERGE_UI and TO_MERGE relationships across different Years.
• Update search index mappings by identifying deprecated terms (TO_MERGE) and their replacements (MERGE).
• Validate controlled vocabulary integrity by checking REPLACEMENT_OPTION_UI and IS_NEW flags for consistency.
• Analyze merge patterns between Descriptors and Supplementary Concept Records using the MERGE column.

Strengths

• Covers a multi-year update period from 2023 to 2026.
• Provides structured fields (e.g., MERGE_UI, TO_MERGE) to track term relationships.
• Available in multiple machine-readable formats including CSV, JSON, XML, and RDF.

Limitations

• Row count is unknown, which may limit suitability assessment.
• Description metadata is limited; actual data quality requires manual inspection after download.

Provenance

Source

datadiscovery.nlm.nih.gov

Collection Method

Official update report from the MeSH vocabulary maintainers.

Time Range

2023-2026

Freshness

Last updated 2026-02-10 20:43:34; freshness should be verified.