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<a class="text-white" href="/research/umls/faq_main.html">FAQ</a>
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<div class="h1">UMLS - Frequently Asked Questions </div>
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<div class="adl-sidenav__title">On this page</div>
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<a href="#access" target="_self">Access the UMLS</a>
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<a href="#about" target="_self">About the UMLS</a>
</li>
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<a href="#using">Using the UMLS</a>
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<h3 id="access">Access the UMLS</h3><!-- start access section-->
<div class=" usa-accordion usa-accordion--bordered"><!-- start accordion-->
<p class="usa-accordion__heading">
<button type="button" class="usa-accordion__button" aria-expanded="true" aria-controls="access1">
How do I sign up for a UMLS license?
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<div id="access1" class="usa-accordion__content"><!-- start accordion content-->
<ol>
<li>Please sign up for a new UMLS Terminology Services (UTS) account
with your preferred
identity provider at the <a class="usa-link"
href="https://uts.nlm.nih.gov/uts/signup-login">UTS
Sign
Up page</a>.
</li>
<li>Complete and submit the UMLS license request form. NLM will send the
license
approval e-mail within 5 business days after reviewing your
authenticated license
request.
</li>
<li>You will <a href="https://uts.nlm.nih.gov/uts/">sign in</a>
using your
identity
provider credentials to download files or access web interfaces that
require UTS
authentication such as the UTS, VSAC, SNOMED CT, or RxNorm.
</li>
</ol>
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How do I access the UMLS?
</button>
</p>
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<!-- start accordion content-->
<p>You must sign up for a license to access the UMLS.</p>
<p>To request a license, click "Sign Up" on the <a href="https://uts.nlm.nih.gov/uts/">UTS
homepage</a>. Additional information can be found on the <a
href="https://www.nlm.nih.gov/databases/umls.html">UMLS
License</a> page. You will
<a href="https://uts.nlm.nih.gov/uts/signup-login">signup/sign
in</a> using
your
identity provider credentials to download files or access web
interfaces that require
UTS authentication such as the UTS, VSAC, SNOMED CT, and RxNorm.
</p>
<p> The UMLS Terminology Services <a href="https://uts.nlm.nih.gov/uts/">(UTS)</a>
provides
three ways to access the UMLS. </p>
<p><b>1) Web Browsers</b></p>
<p>You can search the data through UTS applications:</p>
<ul>
<li>Metathesaurus Browser - Retrieve UMLS concept information,
including CUIs, semantic
types, and synonymous terms.
</li>
<li>Semantic Network Browser - View the names, definitions, and
hierarchical structure
of the Semantic Network.
</li>
</ul>
<p><b>2) Local Installation</b></p>
<p>To install the UMLS on your computer, download the files through the
UTS. The <a
href="https://www.nlm.nih.gov/research/umls/implementation_resources/metamorphosys/index.html">MetamorphoSys</a>
tool, included with the downloaded files, allows you to customize
the UMLS according to
your needs. You can then load your customized data into your own
database system, such
as MySQL or Oracle, or you may browse your data using the
MetamorphoSys RRF browser.</p>
<p><b>3) Web Services APIs</b></p>
<p>You can use our application programming interfaces <a
href="https://documentation.uts.nlm.nih.gov/">(APIs)</a> to
query the UMLS data
within your own application.</p>
</div><!-- end accordion content-->
<p class="usa-accordion__heading">
<button type="button" class="usa-accordion__button" aria-expanded="false" aria-controls="access3">
I usually sign in with a UTS username and password. What
happened to that?
</button>
</p>
<div id="access3" class="usa-accordion__content">
<!-- start accordion content-->
<p>We are no longer supporting username/password sign in. Instead,
you will sign in with
your email address using one of the identity providers above.
</p>
</div><!-- end accordion content-->
<p class="usa-accordion__heading">
<button type="button" class="usa-accordion__button" aria-expanded="false" aria-controls="access4">
I selected "Microsoft" and tried to sign in using my work
email
address, but it didn't work. What should I do?
</button>
</p>
<div id="access4" class="usa-accordion__content">
<!-- start accordion content-->
<p>Your organization may not allow you to sign in to external
services using your Microsoft
credentials. Try one of the following options:
<ul>
<li>Create an account with Login.gov by going to the <a
href="https://secure.login.gov/sign_up/enter_email">Login.gov
sign up page. </a>
Then select "Login.gov" on this page.
</li>
<li>Choose another identity provider.</li>
</ul>
</p>
</div><!-- end accordion content-->
<p class="usa-accordion__heading">
<button type="button" class="usa-accordion__button" aria-expanded="false" aria-controls="access5">
What if I want to sign up for a UTS account / license
but I
don't have an account with any of the identity providers
listed above?
</button>
</p>
<div id="access5" class="usa-accordion__content">
<!-- start accordion content-->
<ol>
<li>Create an account with Login.gov by going to the <a
href="https://secure.login.gov/sign_up/enter_email">
Login.gov sign up </a>page.
Then go to the <a href="https://uts.nlm.nih.gov/uts/signup-login">UTS
sign
up </a>
page, select Login.gov, and sign in if prompted.
</li>
<li>Then go to the <a href="https://uts.nlm.nih.gov/uts/signup-login">UTS
sign
up</a>
page, select Login.gov, and sign in if prompted.
</li>
<li>Complete and submit the UMLS license request form.
NLM will send the license
approval e-mail within 5 business days after
reviewing your authenticated license
request.
</li>
</ol>
</div><!-- end accordion content-->
<p class="usa-accordion__heading">
<button type="button" class="usa-accordion__button" aria-expanded="false" aria-controls="access6">
I am a NIH employee. Which option should I choose?
</button>
</p>
<div id="access6" class="usa-accordion__content">
<!-- start accordion content-->
<p>Choose "NIH Employee" and sign in with your PIV card
or NIH credentials.</p>
</div><!-- end accordion content-->
<p class="usa-accordion__heading">
<button type="button" class="usa-accordion__button" aria-expanded="false" aria-controls="access7">
How do I edit information I submitted in my
license
request? How
do I edit my profile?
</button>
</button>
</p>
<div id="access7" class="usa-accordion__content">
<!-- start accordion content-->
<p> After you receive an approval email, login to
the UTS and go to your <a href="https://uts.nlm.nih.gov/uts/profile">profile
page </a> then select "Edit
profile" in the upper left corner to make your
updates.
</p>
</div><!-- end accordion content-->
<p class="usa-accordion__heading">
<button type="button" class="usa-accordion__button" aria-expanded="false" aria-controls="access8">
I have a question that isn't covered here.
Who can I
ask?
</button>
</>
<div id="access8" class="usa-accordion__content">
<!-- start accordion content-->
<p>If you are encountering errors not covered
here, first try clearing your browser cache
and cookies or try a different web browser.
If that does not resolve your problem,
submit your question to the<a href="https://support.nlm.nih.gov/support/create-case/">
NLM Help Desk.</a> Be sure to describe
your issue in detail so that we can provide
the best possible answer.</p>
</div><!-- end accordion content-->
</div><!-- end accordion-->
</div><!-- end about section-->
<div class="padding-bottom-1">
<h3 id="about">About the UMLS</h3><!-- About the UMLS section-->
<div class="usa-accordion usa-accordion--bordered"><!-- start accordion-->
<p class="usa-accordion__heading">
<button type="button" class="usa-accordion__button" aria-expanded="false" aria-controls="about1">
What is the UMLS?
</button>
</p>
<div id="about1" class="usa-accordion__content"><!-- start accordion content-->
<p>The UMLS, or Unified Medical Language System, is a set of files and software that brings
together many health and biomedical vocabularies and standards to enable
interoperability between computer systems.</p>
<p>You can use the UMLS to enhance or develop applications, such as electronic health
records, classification tools, dictionaries and language translators.</p>
</div><!-- end accordion content-->
<h5 class="usa-accordion__heading">
<button type="button" class="usa-accordion__button" aria-expanded="false" aria-controls="about2">
Where can I get more information about the UMLS?
</button>
</h5>
<div id="about2" class="usa-accordion__content"><!-- start accordion content-->
<p><b>Get Started</b></p>
<p>Begin learning about the UMLS with these tools:</p>
<ul>
<li><a href="https://www.nlm.nih.gov/research/umls/quickstart.html">UMLS
Quick
Start
Guide</a></li>
<li>
<a class="usa-link"
href="https://www.nlm.nih.gov/research/umls/new_users/online_learning/OVR_001.html">UMLS
Basics Tutorial</a>
</li>
<li><a class="usa-link"
href="https://www.nlm.nih.gov/research/umls/new_users/glossary.html">UMLS
Glossary</a></li>
<li>
<a class="usa-link"
href="https://www.nlm.nih.gov/research/umls/user_education/learning_resources.html">UMLS
Video Learning Resources</a>
</li>
</ul>
<p><b>Technical Documentation</b></p>
<p>The <a href="https://www.ncbi.nlm.nih.gov/books/NBK9676/">UMLS
Reference
Manual</a>
provides an overview of the UMLS and:</p>
<ul>
<li>Metathesaurus overview and organization (concepts, relationships, attributes)
</li>
<li>Details about the <a class="usa-link"
href="https://www.ncbi.nlm.nih.gov/books/NBK9685/">RRF</a>
data
files (columns, rows, and descriptions)
</li>
</ul>
<p><b>Vocabulary Documentation</b></p>
<ul>
<li>The <a class="usa-link"
href="https://www.nlm.nih.gov/research/umls/sourcereleasedocs/index.html">Source
Release Documentation</a> has a summary, metadata and statistics for each
vocabulary
in the UMLS Metathesaurus
</li>
<li><a class="usa-link"
href="https://www.ncbi.nlm.nih.gov/books/NBK9684/#_ch02_sec2_10_">Mappings
Representation in the Metathesaurus</a></li>
</ul>
<p><b>MetamorphoSys (Local Installation of the UMLS)</b></p>
<ul>
<li>View the <a
href="https://www.nlm.nih.gov/research/umls/implementation_resources/metamorphosys/index.html">MetamorphoSys</a>
homepage for help with your local installation of the UMLS
</li>
<li>
<a class="usa-link"
href="https://www.nlm.nih.gov/research/umls/implementation_resources/scripts/index.html">Sample
database queries and load scripts</a>
</li>
</ul>
<p><b>Listserv</b></p>
<p>UMLS users are encouraged to subscribe to this list, to share their experiences with,
or
seek advice from the UMLS community on using UMLS resources. NLM also uses this
forum to
distribute official announcements about UMLS products and services.</p>
<ul>
<li>To subscribe, send an e-mail to: listserv@list.nih.gov containing the following
message: SUBSCRIBE UMLSUSERS-L &lt;your full name&gt;
</li>
<li>To post a message to the list AFTER subscribing, send an e-mail to:
UMLSUSERS-L@list.nih.gov
</li>
<li>To access subscription information and list archives, go to: UMLSUSERS-L
Listserv
Web page
</li>
</ul>
</div><!-- end accordion content-->
<p class="usa-accordion__heading">
<button type="button" class="usa-accordion__button" aria-expanded="false" aria-controls="about3">
How often is the UMLS released?
</button>
</p>
<div id="about3" class="usa-accordion__content"><!-- start accordion content-->
<p>The UMLS is updated in May and November of each year. The May release is the AA
release
(ex. 2022AA) and the November release is the AB Release (ex. 2022AB).</p>
</div><!-- end accordion content-->
<p class="usa-accordion__heading">
<button type="button" class="usa-accordion__button" aria-expanded="false" aria-controls="about4">
Where are the release notes?
</button>
</p>
<div id="about4" class="usa-accordion__content"><!-- start accordion content-->
<p>The <a
href="https://www.nlm.nih.gov/research/umls/knowledge_sources/metathesaurus/release/index.html">Release
homepage</a> includes release notes, bugs, metadata, and statistics for
the latest
version of the UMLS.</p>
</div><!-- end accordion content-->
</div><!-- end accordion-->
</div><!-- end about section-->
<div class="padding-bottom-1">
<h3 id="using">Using the UMLS</h3>
<div class="usa-accordion usa-accordion--bordered"><!-- start accordion-->
<p class="usa-accordion__heading">
<button type="button" class="usa-accordion__button" aria-expanded="false" aria-controls="using1">
How do I search within the UMLS?
</button>
</p>
<div id="using1" class="usa-accordion__content">
<!-- start accordion content-->
<p>You can search the data through <a href="https://uts.nlm.nih.gov/uts/">UTS</a>
applications:</p>
<ul>
<li><a href="https://uts.nlm.nih.gov/uts/umls/home">Metathesaurus
Browser</a> -
Retrieve
UMLS concept information, including
CUIs, semantic types, and synonymous
terms.
</li>
<li><a href="https://uts.nlm.nih.gov/uts/umls/semantic-network/root">Semantic
Network
Browser</a> - View the names,
definitions, and hierarchical
structure of the <a href="https://lhncbc.nlm.nih.gov/semanticnetwork/">Semantic
Network</a>.
</li>
<li><a href="https://documentation.uts.nlm.nih.gov/">UMLS
API</a> -
Programmatically
search and retrieve UMLS data
</li>
</ul>
<p>You can search the data through your
local installation:</p>
<ul>
<li>RRF Browser - Retrieve UMLS concept
information, including: CUIs,
semantic types,
and synonymous terms from your
installed data subset.
</li>
</ul>
</div> <!-- end accordion content-->
<p class="usa-accordion__heading">
<button type="button" class="usa-accordion__button" aria-expanded="false" aria-controls="using2">
How do I access downloads within the UMLS?
</button>
</p>
<div id="using2" class="usa-accordion__content">
<!-- start accordion content-->
<p>There are two ways to access the
downloads:</p>
<ul>
<li>
<a class="usa-link"
href="https://www.nlm.nih.gov/research/umls/licensedcontent/umlsknowledgesources.html">UMLS
Release Downloads Page</a>
</li>
<li><a href="https://uts.nlm.nih.gov/uts/">Sign
in to the UTS and click on
the
Downloads
menu</a>.
</li>
</ul>
</div><!-- end accordion content-->
<p class="usa-accordion__heading">
<button type="button" class="usa-accordion__button" aria-expanded="false" aria-controls="using3">
What terminology and mapping
files are available for
download?
</button>
</p>
<div id="using3" class="usa-accordion__content">
<!-- start accordion content-->
<p>Go to the <a
href="https://www.nlm.nih.gov/research/umls/licensedcontent/downloads.html">Downloads
Homepage</a> to view
available downloads.</p>
</div><!-- end accordion content-->
<p class="usa-accordion__heading">
<button type="button" class="usa-accordion__button" aria-expanded="false" aria-controls="using4">
What is the UTS?
</button>
</p>
<div id="using4" class="usa-accordion__content">
<!-- start accordion content-->
<p>The UMLS Terminology Services
(<a href="https://uts.nlm.nih.gov/uts/">UTS</a>)
Web site
gives you access to the UMLS
browsers, downloads, and
APIs.</p>
</div><!-- end accordion content-->
<p class="usa-accordion__heading">
<button type="button" class="usa-accordion__button" aria-expanded="false" aria-controls="using5">
How can I submit
requests for changes or
additions to the
UMLS?
</button>
</p>
<div id="using5" class="usa-accordion__content">
<!-- start accordion content-->
<p>You can request changes
or additions to the UMLS
by contacting <a href="//support.nlm.nih.gov/?style=classic&deptID=28054">NLM
Customer
Support</a>.
If additions are
specific to the source,
you should contact the
terminology source
provider. Contact
information is available
in <a
href="https://www.nlm.nih.gov/research/umls/knowledge_sources/metathesaurus/release/license_agreement_appendix.html">Appendix
1</a> of the License
agreement.</p>
</div><!-- end accordion content-->
</div><!-- end accordion-->
</div><!-- end section-->
<div class="padding-bottom-1">
<h3 id="licensing">Licensing</h3>
<div class="usa-accordion usa-accordion--bordered">
<!-- start accordion-->
<p class="usa-accordion__heading">
<button type="button" class="usa-accordion__button" aria-expanded="false"
aria-controls="licensing1">
Are there any fees
for the UMLS
license?
</button>
</p>
<div id="licensing1" class="usa-accordion__content">
<!-- start accordion content-->
<ul>
<li>There are no
fees for the
UMLS
Metathesaurus
License</li>
<li>Appendix 2 of
the license, the
SNOMED CT
Affiliate
License
Agreement,
refers to fees
for the use of
SNOMED CT in a
non-Member
country/territory.
Contact SNOMED
International
with any
questions
regarding <a href="http://www.snomed.org/snomed-ct/get-snomed-ct">fees
for use</a>
before
signing up for a
UMLS license.
</li>
</ul>
</div>
<!-- end accordion content-->
<p class="usa-accordion__heading">
<button type="button" class="usa-accordion__button" aria-expanded="false"
aria-controls="licensing2">
Is an
organizational
license
available?
</button>
</p>
<div id="licensing2" class="usa-accordion__content">
<!-- start accordion content-->
<p>Licenses are
registered to
individuals.
There are no
organizational
or enterprise
licenses.</p>
</div>
<!-- end accordion content-->
<p class="usa-accordion__heading">
<button type="button" class="usa-accordion__button" aria-expanded="false"
aria-controls="licensing3">
Does
everyone in
my
organization
need a
license?
</button>
</p>
<div id="licensing3" class="usa-accordion__content">
<!-- start accordion content-->
<p>NLM requires
at least
one
licensee per
organization.
However, it
is fine to
have
multiple
licensees
from the
same
organization.
Each person
who requires
access to
the
browsers
and/or
downloads
must have
their own
license. We
do not
encourage
users to
share
account
information
with one
another.</p>
</div>
<!-- end accordion content-->
<p class="usa-accordion__heading">
<button type="button" class="usa-accordion__button" aria-expanded="false"
aria-controls="licensing4">
Are
there
special
rules
for
vendors
or other
commercial
organizations?
</button>
</p>
<div id="licensing4" class="usa-accordion__content">
<!-- start accordion content-->
<p>There is
not a
separate
license
for
commercial
organizations.
However,
if your
product
incorporates
data
from the
UMLS,
you must
have a
license.
Additionally,
we
require
that
your
clients
have a
license
as well.
The same
license
and
rules
apply to
all
users.
</p>
</div>
<!-- end accordion content-->
<p class="usa-accordion__heading">
<button type="button" class="usa-accordion__button" aria-expanded="false"
aria-controls="licensing5">
Where
can
I
get
a
copy
of
the
license?
</button>
</p>
<div id="licensing5" class="usa-accordion__content">
<!-- start accordion content-->
<p>View
the
<a href="https://uts.nlm.nih.gov/uts/assets/LicenseAgreement.pdf">PDF
of
the
license
agreement</a>.
</p>
</div>
<!-- end accordion content-->
<p class="usa-accordion__heading">
<button type="button" class="usa-accordion__button" aria-expanded="false"
aria-controls="licensing6">
I
have
questions
about
a
specific
vocabulary
that
are
not
covered
by
the
license
agreement.
</button>
</p>
<div id="licensing6" class="usa-accordion__content">
<!-- start accordion content-->
<p>Contact
the
content
provider
directly
to
ensure
that
your
use
is
covered
by
the
UMLS
License.
<a
href="https://www.nlm.nih.gov/research/umls/knowledge_sources/metathesaurus/release/license_agreement_appendix.html">Appendix
1</a>
of
the
license
lists
contact
information
for
each
vocabulary.
</p>
</div>
<!-- end accordion content-->
<p class="usa-accordion__heading">
<button type="button" class="usa-accordion__button" aria-expanded="false"
aria-controls="licensing7">
What
is
the
UMLS
Annual
Report?
</button>
</p>
<div id="licensing7" class="usa-accordion__content">
<!-- start accordion content-->
<p>As
part
of
the
license
agreement,
you
agree
to
provide
NLM
with
a
yearly
report
of
how
you
used
the
UMLS.
The
report
is
due
every
January.
NLM
will
send
several
e-mail
reminders
in
January
and
you
will
complete
the
report
through
your
<a href="https://uts.nlm.nih.gov/uts/">UTS</a>
profile.
</p>
</div><!-- end accordion content-->
<p class="usa-accordion__heading">
<button type="button" class="usa-accordion__button" aria-expanded="false"
aria-controls="licensing8">
What is the SNOMED CT Affiliate Report? </button>
</p>
<div id="licensing8" class="usa-accordion__content">
<!-- start accordion content-->
<p>As
mentioned
in
the
SNOMED
CT
Affiliate
License
Agreement,
you
agree
to
report
to
the
SNOMED
International
on
your
usage
of
SNOMED
CT
in
<a href="https://www.snomed.org/members">non-Member
countries</a>.
This
report
is
imbedded
within
the
UMLS
Annual
Report.
Complete
details
are
available
from
<a href="https://www.snomed.org/get-snomed">SNOMED
International</a>.
</p>
</div><!-- end accordion content-->
</div><!-- end accordion-->
</div><!-- end section-->
<div class="padding-bottom-1">
<h3 id="resources">Resources</h3>
<h4>Metathesaurus</h4>
<ul>
<li>
<a class="usa-link"
href="https://www.nlm.nih.gov/research/umls/knowledge_sources/metathesaurus/source_faq.html">Metathesaurus
Source
Vocabularies
FAQ</a>
</li>
<li>
<a class="usa-link"
href="https://www.nlm.nih.gov/research/umls/knowledge_sources/metathesaurus/source_evaluation.html">How
to
submit
a
vocabulary
for
inclusion
in
the
Metathesaurus</a>
</li>
</ul>
<h4>
Other
NLM
Terminologies</h4>
<ul>
<li><a href="https://www.nlm.nih.gov/mesh/">MeSH</a>
</li>
<li><a href="https://www.nlm.nih.gov/research/umls/rxnorm/index.html">RxNorm</a>
</li>
<li><a href="https://www.nlm.nih.gov/healthit/snomedct/index.html">SNOMED
CT</a>
</li>
</ul>
<h4>Contact Us</h4>
<p>We
welcome
any
questions
and
comments
via
our
<a
href="//support.nlm.nih.gov/?style=classic&deptID=28054&category=umls&from=https://www.nlm.nih.gov/research/umls/faq_main.html">contact
form</a>.
</p>
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<h5>Training and Documentation</h5>
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<p><a href="/research/umls/faq_main.html">FAQs</a>
</p>
<p><a href="/research/umls/new_users/online_learning/OVR_001.html">Basics
Tutorial</a>
</p>
<p><a href="/research/umls/user_education/learning_resources.html">Video
Tutorials</a>
</p>
<p><a href="//www.ncbi.nlm.nih.gov/books/NBK9676/">Reference
Manual</a>
</p>
<p><a href="/research/umls/knowledge_sources/metathesaurus/release/index.html">Release
Notes
and
Statistics</a>
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<p><a href="/research/umls/sourcereleasedocs/index.html">Vocabulary
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UMLS
Using
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Load
Scripts</a>
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<p><a href="/research/umls/implementation_resources/query_diagrams/index.html">Database
Query
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<h6>UMLS
Community</h6>
</div>
<div class="usa-card__body"><!-- start card body-->
<p><a href="support.html">Listserv</a>
</p>
<p><a href="/research/umls/implementation_resources/community/user_feedback.html">User
Feedback</a>
</p>
<p><a href="/research/umls/implementation_resources/community/index.html">User
Contributions</a>
</p>
<p><a
href="//www.ncbi.nlm.nih.gov/pubmed/?term=Unified+Medical+Language+System+%5Btiab%5D+OR+UMLS+%5Btiab%5D+OR+UMLS+%5Bmh%5D">Publications</a>
</p>
<p><a href="//www.nlm.nih.gov/archive//20040831/pubs/cbm/umlscbm.html">Comprehensive
Bibliography
(1986-1996)</a>
</p>
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NLM
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<p><a href="/healthit/index.html">Health
Information
Technology
at
NLM</a>
</p>
<p><a href="/research/umls/knowledge_sources/metathesaurus/mapping_projects/index.html">Terminology
Mappings</a>
</p>
<p><a href="/research/umls/rxnorm/index.html">RxNorm</a>
</p>
<p><a href="/healthit/snomedct/index.html">SNOMED
CT</a>
</p>
<p><a href="//vsac.nlm.nih.gov/">Value
Set
Authority
Center</a>
</p>
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<p class=”margin-top-5”><small>Last Reviewed: May 18, 2021</small></p>
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