MeSH 2026 Update: Medical Subject Headings Change Log 2023-2026

The MeSH 2026 Update - Update (All Fields) Report lists each individual modification made to a Descriptor or Supplementary Concept Record (SCR). More than one field on a term can be modified during the Year-End Processing (YEP), resulting in a term having multiple entries on the list. This report includes MeSH changes from previous years, starting from 2023, and is provided by datadiscovery.nlm.nih.gov.

Use Cases

• Track changes to specific vocabulary fields (UPDATED_FIELD, REPLACED_VALUE, REPLACEMENT_VALUE) over time (Year) for data versioning.
• Analyze the evolution of medical terminology by examining the NOTES and UI fields for specific concepts.
• Validate and update local MeSH mappings by comparing REPLACED_VALUE and REPLACEMENT_VALUE across the provided columns.

Strengths

• Includes changes from a multi-year period (2023 to 2026).
• Provides detailed field-level change tracking (UPDATED_FIELD, REPLACED_VALUE, REPLACEMENT_VALUE).
• Data is available in multiple structured formats (CSV, JSON, XML, 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 Medical Subject Headings (MeSH) vocabulary maintenance process.

Time Range

Covers changes from 2023 to 2026.

Freshness

Last updated 2026-02-10 20:38:49.