UMLS

nlm.nih.gov ↗

Connected biomedical terminologies for mapping concepts

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SI Score: 60/100
Pricing: Not confirmed
Free plan: Not confirmed
Sign-up required: Required AI reading, not confirmed

Concept Mapping controlled-vocabularies biomedical-terminology

Ask SI about UMLS

Answers use saved listing facts and recorded sources.

What it does

The Unified Medical Language System brings together biomedical vocabularies and standards, with browsing and downloads through a UTS account.

Use UMLS when a concept appears under different terms or codes in different systems. Its linked vocabularies support mapping and information retrieval. Access requires an individual license and account, and some source terminologies can require additional vendor agreements, so check the relevant vocabulary's conditions before reuse.

Watch out for

An individual license and UTS account are required; some terminologies have additional agreements

Sources

Unified Medical Language System (UMLS) (Oct 26, 2026)

SI Score

60/100

#105 in Reference

Based on published information. No hands-on task test.

Method 2.0 · Published source review Assessed Oct 26, 2026Score ceiling for this evidence: 84/100.

Product usefulness 60

Evidence

Mapping a concept across vocabularies has a specific input/output task and an explicit terminology-licence boundary.

Limits: AI review of saved source passages. No hands-on test, human approval or automatic-provider checker receipt.

Source links and check dates are in Sources and checks below.

Separate website checks

These checks do not add points to the SI Score. They inspect the website's HTML, not the product in use.

Basic website checksunknown

No check recorded.

HTML accessibility checksunknown

No check recorded.

Homepage HTML responseunknown

No check recorded.

Trackers in homepage HTMLunknown

No check recorded.

Page date hintsunknown

No check recorded.

Policy links do not verify a company's conduct. An HTML response time is not application speed. Tracker and accessibility checks miss behavior after page load. Copyright dates do not prove product upkeep.

How the SI Score works →

Unconfirmed details may be unassessed, absent from the pages checked or temporarily unreadable. A missing price does not mean the service is free.

Sources and checks

Supporting pages for product usefulness, site facts, prices and separate website checks. Each record keeps its own date. Reading a page does not establish how well the product performs in use.

www.nlm.nih.gov/research/umls/index.html
- Sign-up requiredAI reading, not confirmedChecked Oct 26, 2026
  The official access guidance requires an individual UMLS licence and a UTS account.
- APIAI reading, not confirmedChecked Oct 26, 2026
  The official access page lists an API route alongside browsing and downloads.
- Product usefulness evidenceChecked Oct 26, 2026

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