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Federal
Unified Medical Language System (UMLS)
U.S. Department of Health & Human Services —
The UMLS integrates and distributes key terminology, classification and coding standards, and associated resources to promote creation of more effective and... -
Federal
Medical Subject Headings (MeSH)
U.S. Department of Health & Human Services —
Medical Subject Headings (MeSH) is a hierarchically-organized terminology for indexing and cataloging of biomedical information. It is used for the indexing of PubMed... -
Federal
AccessGUDID
U.S. Department of Health & Human Services —
The Global Unique Device Identification Database (GUDID) contains key device identification information submitted to the FDA about medical devices that have Unique... -
Federal
RxNav-in-a-Box
U.S. Department of Health & Human Services —
RxNav-in-a-Box provides users with a locally-installable RxNav (https://rxnav.nlm.nih.gov/RxNavDoc.html) and RESTful companion APIs, including RxNorm, RxTerms,... -
Federal
Medical Text Indexer (MTI)
U.S. Department of Health & Human Services —
A system for producing indexing recommendations to assist in the indexing process at NLM. Currently provides indexing recommendations to more than 100 journals based... -
Federal
NIH Common Data Elements Repository
U.S. Department of Health & Human Services —
The NIH Common Data Elements (CDE) Repository has been designed to provide access to structured human and machine-readable definitions of data elements that have been... -
Federal
Value Set Authority Center
U.S. Department of Health & Human Services —
The VSAC is a repository and authoring tool for public value sets created by external programs. Value sets are lists of codes and corresponding terms, from NLM-hosted... -
Federal
MeSH 2025 Update - Registry Number Update Report
U.S. Department of Health & Human Services —
(Includes MeSH 2023 and 2024 changes) The MeSH 2025 Update - Registry Number Update Report lists changes to Registry Numbers on a Descriptor or Supplementary Concept... -
Federal
MeSH 2024 Update - Split Report
U.S. Department of Health & Human Services —
(Includes MeSH 2023 changes) The MeSH 2024 Update - Split Report lists terms that are replaced by a set of terms, either descriptors or SCRs, instead of a single... -
Federal
MeSH 2025 Update - Replace Report
U.S. Department of Health & Human Services —
(Includes MeSH 2023 and 2024 changes) The MeSH 2025 Update - Replace Report lists Descriptors and Supplementary Concept Records (SCRs) where an existing MeSH term has... -
Federal
MeSH 2025 Update - Update All Fields Report
U.S. Department of Health & Human Services —
(Includes MeSH 2023 and 2024 changes) The MeSH 2025 Update - Update (All Fields) Report lists each individual modification made to a Descriptor or Supplementary... -
Federal
Clinical Table Search Service
U.S. Department of Health & Human Services —
Clinical Table Search Service (formerly "lforms-service") is a web service which software programs can use for querying clinical data tables. -
Federal
MeSH 2025 Update - Delete Report
U.S. Department of Health & Human Services —
(Includes MeSH 2023 and 2024 changes) The MeSH 2025 Update - Delete Report lists Descriptors and Supplementary Concept Records (SCRs) that have been removed from... -
Federal
Annual MeSH Processing (AMP)
U.S. Department of Health & Human Services —
An overview of Annual MeSH Processing (AMP) for MeSH/MEDLINE, including downloadable datasets detailing changes to MeSH