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License status and Mdexa hosting, recorded separatelyAll datasets

UMLS Metathesaurus

Verified by Mdexa · Checked against the source text under public rules.How we check

Commercial use
UnclearUnstated
Derivatives
No
Redistribution
Conditional
File on Mdexa
NoLink only

a restricted part cannot be separated or the boundary is unstated: strictest part applies

RestrictedLink onlyLicenseRef-National-Library-of-Medicine-termsSave

Badge

Mdexa verified · Restricted · 2026-11Mdexa verifiedRestricted · 2026-11

[![Mdexa verified · Restricted · 2026-11](https://mcp.mdexa.com/v1/badge/datasets/umls.svg)](https://mdexa.com/datasets/umls/)

Place it on a repository or dataset page; the status and date follow the verification. About badges

Cite this pageMdexa, UMLS Metathesaurus, https://mdexa.com/datasets/umls/, verified 2026-11-13.

Key facts

Domain
Standards and terminology Cross-cutting
Also known as
umls-mesh
Content
Terminologies and coding systems
Size
—
Language / modality
English / Text
Publisher
National Library of Medicine
Year
—
Expert review
—
Verification
Verified: license text seen

Commercial use of UMLS Metathesaurus

Commercial use: Unclear (Unstated). The overall verdict takes the strictest part; the parts carry different licenses, listed below. License status: Restricted.

Conditions
No derivatives
License part
main data — Restricted (NOASSERTION)
License part
UMLS vocabulary sources with additional restrictions (categories 1 to 4) — Restricted (NOASSERTION)

Quoted statements and their sources are in UMLS Metathesaurus license evidence.

Verdicts record what sources state and are not legal advice.

UMLS Metathesaurus license evidence 12

  1. Terms of use pagePage opened
    Third-party text · Terms of use pageThe NLM hereby grants a nonexclusive, non-transferable right to LICENSEE to use the UMLS Metathesaurus and incorporate its content in any computer applications or systems designed to improve access to biomedical information of any type subject to the restrictions in other provisions of this Agreemen

    Statement found in snapshot s01 (terms-page)

    nlm.nih.gov2026-11-13 · s01
  2. Terms of use pagePage opened
    Third-party text · Terms of use pageLICENSEE is prohibited from distributing the UMLS Metathesaurus or subsets of it, including individual vocabulary sources within the Metathesaurus, except (a) as an integral part of computer applications developed by LICENSEE for a purpose other than redistribution of vocabulary sources contained in

    Statement found in snapshot s01 (terms-page)

    nlm.nih.gov2026-11-13 · s01
  3. Terms of use pagePage opened
    Third-party text · Terms of use pageFor material in the UMLS Metathesaurus obtained from some sources additional restrictions on LICENSEE's use may apply.

    Statement found in snapshot s01 (terms-page)

    nlm.nih.gov2026-11-13 · s01
  1. Terms of use pagePage opened
    Third-party text · Terms of use pageLICENSEE is prohibited from translating the vocabulary source into another language or from producing other derivative works based on this single vocabulary source.

    Statement found in snapshot s01 (terms-page)

    nlm.nih.gov2026-11-13 · s01
  2. Terms of use pagePage opened
    Third-party text · Terms of use pageLICENSEE is prohibited from using the vocabulary source in operational applications that create records or information containing data from the vocabulary source.

    Statement found in snapshot s01 (terms-page)

    nlm.nih.gov2026-11-13 · s01
  3. Terms of use pagePage opened
    Third-party text · Terms of use pageLICENSEE's right to use material from the source vocabulary is restricted to internal use at the LICENSEE's site(s) for research, product development, and statistical analysis only.

    Statement found in snapshot s01 (terms-page)

    nlm.nih.gov2026-11-13 · s01
  4. Terms of use pagePage opened
    Third-party text · Terms of use pageLICENSEE is prohibited from translating the vocabulary source into another language or from altering the vocabulary source content.

    Statement found in snapshot s01 (terms-page)

    nlm.nih.gov2026-11-13 · s01
  5. Terms of use pagePage opened
    Third-party text · Terms of use pageLICENSEE has the right to distribute the vocabulary source in the U.S., but only in combination with other UMLS Metathesaurus content.

    Statement found in snapshot s01 (terms-page)

    nlm.nih.gov2026-11-13 · s01
  6. Terms of use pagePage opened
    Third-party text · Terms of use pageLICENSEE is prohibited from using the vocabulary source in operational applications that create records or information containing data from the vocabulary source. Use for data creation research or product development is allowed.

    Statement found in snapshot s01 (terms-page)

    nlm.nih.gov2026-11-13 · s01
  7. Terms of use pagePage opened
    Third-party text · Terms of use pageInternal research, product development, and statistical analysis use expressly excludes: use of material from these copyrighted sources in routine patient data creation; incorporation of material from these copyrighted sources in any publicly accessible computer-based information system or public el

    Statement found in snapshot s01 (terms-page)

    nlm.nih.gov2026-11-13 · s01
  8. Terms of use pagePage opened
    Third-party text · Terms of use page12.4.2. LICENSEE's right to use the vocabulary source is restricted to use in the U.S. by LICENSEE's employees, contractors, faculty, students, clients, patients, or constituents within electronic systems or devices built, purchased, licensed, or used by LICENSEE for U.S. governmental purposes or fo

    Statement found in snapshot s01 (terms-page)

    nlm.nih.gov2026-11-13 · s01
  9. Terms of use pagePage opened
    Third-party text · Terms of use page12.4.1. LICENSEE is prohibited from translating the vocabulary source into another language or from altering the vocabulary source content.

    Statement found in snapshot s01 (terms-page)

    nlm.nih.gov2026-11-13 · s01

Source and lineage

No upstream or downstream datasets recorded.

Known issues with UMLS Metathesaurus

—

Preflight

Not run Runs only on ingested data; says nothing about quality.

Downloading UMLS Metathesaurus and API access

No file on Mdexa (see the verdict). Get it from the source and confirm the terms there:

The terms are restricted; no download command is given. See the verdict.

Citing UMLS Metathesaurus

Mdexa, UMLS Metathesaurus, https://mdexa.com/datasets/umls/, verified 2026-11-13.
More citation details

The source gives no citation text; the line above cites this card.

Machine-readable

umls.jsonumls.mdcatalog.json

Change log 1
2026-11-13Listed on 2026-11-13. Judged by public rules and checked a second time before listing. The two passes disagreed; the stricter reading is carried: Second pass: derivatives: 第一遍自相矛盾：conditions 已列 no-derivatives，字段却写 unstated。类别 1 和类别 4 分别明示禁止翻译与制作衍生作品、禁止改动内容，类别 3 也把 creating derivative works 列为明确排除项，应改为 no。

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