UMLS Release File Archives

Please visit the UMLS Reference Manual for details about the archived UMLS release files below, or view the current release documentation.

2016AB-present
2004-2016AA
2002-2003

2016AB - present

Version	Date released	Full Release Files	UMLS Metathesaurus Files	MRCONSO.RRF
2025AA	May 2025	2025AA Full Release	2025AA UMLS Metathesaurus Full Subset 2025AA UMLS Metathesaurus Level 0 Subset UMLS History Files	2025AA MRCONSO.RRF
2024AB	November 2024	2024AB Full Release	2024AB UMLS Metathesaurus Full Subset 2024AB UMLS Metathesaurus Level 0 Subset UMLS History Files	2024AB MRCONSO.RRF
2024AA	May 2024	2024AA Full Release	2024AA UMLS Metathesaurus Full Subset 2024AA UMLS Metathesaurus Level 0 Subset UMLS History Files	2024AA MRCONSO.RRF
2023AB	November 2023	2023AB Full Release	2023AB UMLS Metathesaurus Full Subset 2023AB UMLS Metathesaurus Level 0 Subset UMLS History Files	2023AB MRCONSO.RRF
2023AA	May 2023	2023AA Full Release	2023AA UMLS Metathesaurus Full Subset 2023AA UMLS Metathesaurus Level 0 Subset UMLS History Files	2023AA MRCONSO.RRF
2022AB	November 2022	2022AB Full Release	2022AB UMLS Metathesaurus Full Subset 2022AB UMLS Metathesaurus Level 0 Subset UMLS History Files	2022AB MRCONSO.RRF
2022AA	May 2 2022	2022AA Full Release	2022AA UMLS Metathesaurus Files	2022AA MRCONSO.RRF
2021AB	November 1 2021	2021AB Full Release	2021AB UMLS Metathesaurus Files	2021AB MRCONSO.RRF
2021AA	November 1 2021	2021AA Full Release	2021AA UMLS Metathesaurus Files	2021AA MRCONSO.RRF
2020AB	November 2 2020	2020AB Full Release	2020AB UMLS Metathesaurus Files	2020AB MRCONSO.RRF
2020AA	May 4 2020	2020AA Full Release	2020AA UMLS Metathesaurus Files	2020AA MRCONSO.RRF
2019AB	November 4 2019	2019AB Full Release	2019AB UMLS Metathesaurus Files	2019AB MRCONSO.RRF
2019AA	May 6 2019	2019AA Full Release	2019AA UMLS Metathesaurus Files	2019AA MRCONSO.RRF
2018AB	November 5 2018	2018AB Full Release	Unavailable	Unavailable
2018AA	May 7 2018	2018AA Full Release	Unavailable	Unavailable
2017AB	November 6 2017	2017AB Full Release	Unavailable	Unavailable
2017AA	May 8 2017	2017AA Full Release	2017AA Active Release	Unavailable
2016AB	November 6 2016	2016AB Full Release	2016AB Active Release	Unavailable

2004-2016AA

Note: Releases from 2013AA-2016AA contained active and full release files.

Version	Date released	CHK and MD5	1-meta.nlm, 2-meta.nlm, and otherks.nlm	mmsys.zip	copyright notice and README.txt
2016AA full release files	May 9 2016	2016AA.CHK 2016AA.MD5	2016aa-1-meta.nlm 2016aa-2-meta.nlm 2016aa-otherks.nlm	mmsys.zip	Copyright_Notice.txt README.txt
2016AA active release files	May 9 2016	2016AA.CHK 2016AA.MD5	2016aa-1-meta.nlm 2016aa-2-meta.nlm 2016aa-otherks.nlm	mmsys.zip	Copyright_Notice.txt README.txt
2015AB full release files	November 9 2015	2015AB.CHK 2015AB.MD5	2015ab-1-meta.nlm 2015ab-2-meta.nlm 2015ab-otherks.nlm	mmsys.zip	Copyright_Notice.txt README.txt
2015AB active release files	November 9, 2015	2015AB.CHK 2015AB.MD5	2015ab-1-meta.nlm 2015ab-2-meta.nlm 2015ab-otherks.nlm	mmsys.zip	Copyright_Notice.txt README.txt
2015AA	May 11, 2015	2015AA.CHK 2015AA.MD5	2015aa-1-meta.nlm 2015aa-2-meta.nlm 2015aa-otherks.nlm	mmsys.zip	Copyright_Notice.txt README.txt
2015AA active release files	May 11 2015	2015AA.CHK 2015AA.MD5	2015aa-1-meta.nlm 2015aa-2-meta.nlm 2015aa-otherks.nlm	mmsys.zip	Copyright_Notice.txt README.txt
2014AB full release files	November 10 2014	2014AB.CHK 2014AB.MD5	2014ab-1-meta.nlm 2014ab-2-meta.nlm 2014ab-otherks.nlm	mmsys.zip	Copyright_Notice.txt README.txt
2014AB active release files	November 10 2014	2014AB.CHK 2014AB.MD5	2014ab-1-meta.nlm 2014ab-2-meta.nlm 2014ab-otherks.nlm	mmsys.zip	Copyright_Notice.txt README.txt
2014AA	May 5 2014	2014AA.CHK 2014AA.MD5	2014aa-1-meta.nlm 2014aa-2-meta.nlm 2014aa-otherks.nlm	mmsys.zip	Copyright_Notice.txt README.txt
2014AA active release files	May 5 2014	2014AA.CHK 2014AA.MD5	2014aa-1-meta.nlm 2014aa-2-meta.nlm 2014aa-otherks.nlm	mmsys.zip	Copyright_Notice.txt README.txt
2013AB full release files	February 10 2014	2013AB.CHK 2013AB.MD5	2013ab-1-meta.nlm 2013ab-2-meta.nlm 2013ab-otherks.nlm	mmsys.zip	Copyright_Notice.txt README.txt
2013AB active release files	February 10 2014	2013AB.CHK 2013AB.MD5	2013ab-1-meta.nlm 2013ab-2-meta.nlm 2013ab-otherks.nlm	mmsys.zip	Copyright_Notice.txt README.txt
2013AA full release files	May 8 2013	2013AA.CHK 2013AA.MD5	2013aa-1-meta.nlm 2013aa-2-meta.nlm 2013aa-otherks.nlm	mmsys.zip	Copyright_Notice.txt README.txt
2013AA active release files	May 8 2013	2013AA.CHK 2013AA.MD5	2013aa-1-meta.nlm 2013aa-2-meta.nlm 2013aa-otherks.nlm	mmsys.zip	Copyright_Notice.txt README.txt
2012AB full release files	November 15 2012	2012AB.CHK 2012AB.MD5	2012ab-1-meta.nlm 2012ab-2-meta.nlm 2012ab-otherks.nlm	mmsys.zip	Copyright_Notice.txt README.txt
2012AA full release files	May 7 2012	2012AA.CHK 2012AA.MD5	2012aa-1-meta.nlm 2012aa-2-meta.nlm 2012aa-otherks.nlm	mmsys.zip	Copyright_Notice.txt README.txt
2011AB full release files	November 18 2011	2011AB.CHK 2011AB.MD5	2011ab-1-meta.nlm 2011ab-2-meta.nlm 2011ab-otherks.nlm	mmsys.zip	Copyright_Notice.txt README.txt
2011AA full release files	May 5 2011	2011AA.CHK 2011AA.MD5	2011aa-1-meta.nlm 2011aa-2-meta.nlm 2011aa-otherks.nlm	mmsys.zip	Copyright_Notice.txt README.txt
2010AB full release files	November 1 2010	2010AB.CHK 2010AB.MD5	2010ab-1-meta.nlm 2010ab-2-meta.nlm 2010ab-otherks.nlm	mmsys.zip	Copyright_Notice.txt README.txt
2010AA full release files	April 3 2010	2010AA.CHK 2010AA.MD5	2010aa-1-meta.nlm 2010aa-2-meta.nlm 2010aa-otherks.nlm	mmsys.zip	Copyright_Notice.txt README.txt
2009AB full release files	November 2 2009	2009AB.CHK 2009AB.MD5	2009ab-1-meta.nlm 2009ab-2-meta.nlm 2009ab-otherks.nlm	mmsys.zip	Copyright_Notice.txt README.txt
2009AA full release files	April 6 2009	2009AA.CHK 2009AA.MD5	2009aa-1-meta.nlm 2009aa-2-meta.nlm 2009aa-otherks.nlm	mmsys.zip	Copyright_Notice.txt README.txt
2008AB full release files	November 17 2008	2008AB.CHK 2008AB.MD5	2008ab-1-meta.nlm 2008ab-2-meta.nlm 2008ab-otherks.nlm	mmsys.zip	Copyright_Notice.txt README.txt
2008AA full release files	April 1 2008	2008AA.CHK 2008AA.MD5	2008aa-1-meta.nlm 2008aa-2-meta.nlm 2008aa-otherks.nlm	mmsys.zip	Copyright_Notice.txt README.txt
2007AC full release files	November 5 2007	2007AC.CHK 2007AC.MD5	2007ac-1-meta.nlm 2007ac-2-meta.nlm 2007ac-otherks.nlm	mmsys.zip	Copyright_Notice.txt README.txt
2007AB full release files	July 3 2007	2007AB.CHK 2007AB.MD5	2007ab-1-meta.nlm 2007ab-2-meta.nlm 2007ab-otherks.nlm	mmsys.zip	Copyright_Notice.txt README.txt
2007AA full release files	January 16 2007	2007AA.CHK 2007AA.MD5	2007aa-1-meta.nlm 2007aa-1-meta.nlm 2007aa-2-meta.nlm 2007aa-otherks.nlm	mmsys.zip	Copyright_Notice.txt README.txt
2006AD full release files	November 3 2006	2006AD.CHK 2006AD.MD5	2006ad-1-meta.nlm 2006ad-2-meta.nlm 2006ad-otherks.nlm	mmsys.zip	Copyright_Notice.txt README.txt
2006AC full release files	July 17 2006	2006AC.CHK 2006AC.MD5	2006ac-1-meta.nlm 2006ac-2-meta.nlm 2006ac-otherks.nlm	mmsys.zip	Copyright_Notice.txt README.txt
2006AB full release files	May 10 2006	2006AB.CHK 2006AB.MD5	2006ab-1-meta.nlm 2006ab-2-meta.nlm 2006ab-otherks.nlm	mmsys.zip	Copyright_Notice.txt README.txt
2006AA full release files	February 13 2006	2006AA.CHK 2006AA.MD5	2006aa-1-meta.nlm 2006aa-2-meta.nlm 2006aa-otherks.nlm	mmsys.zip	Copyright_Notice.txt README.txt
2005AC full release files	November 23 2005	2005AC.CHK 2005AC.MD5	2005ac-1-meta.nlm 2005ac-2-meta.nlm 2005ac-3-meta.nlm 2005ac-otherks.nlm	mmsys.zip	Unavailable
2005AB full release files	June 16 2005	2005AB.CHK 2005AB.MD5	2005ab-1-meta.nlm 2005ab-2-meta.nlm 2005ab-3-meta.nlm 2005ab-otherks.nlm	mmsys.zip	Copyright_Notice.txt README.txt
2005AA full release files	January 19 2005	2005AA.CHK 2005AA.MD5	2005aa-1-meta.nlm 2005aa-2-meta.nlm 2005aa-3-meta.nlm 2005aa-otherks.nlm	mmsys.zip	Copyright_Notice.txt README.txt
2004AC full release files	October 26 2004	2004AC.CHK 2004AC.MD5	2004ac-1-meta.nlm 2004ac-2-meta.nlm 2004ac-3-meta.nlm 2004ac-otherks.nlm	mmsys.zip	Copyright_Notice.txt README.txt
2004AB full release files	July 23 2004	2004AB.CHK 2004AB.MD5	2004ab-1-meta.nlm 2004ab-2-meta.nlm 2004ab-3-meta.nlm 2004ab-otherks.nlm	mmsys.zip	Copyright_Notice.txt README.txt
2004AA full release files	July 23 2004	2004AA.CHK 2004AA.MD5	2004aa-1-meta.nlm 2004aa-2-meta.nlm 2004aa-3-meta.nlm 2004aa-otherks.nlm	mmsys.zip	Copyright_Notice.txt README.txt

2002 - 2003

Note: Each release from 2002-2003 came in two formats: ISO and UNIX.

Version	Format	Date released	CHK and MD5	ZIP or TGZ _1 and _2	copyright notice and additional documentation
2003AC	ISO format (.ZIP)	November 2003	2003AC.CHK 2003AC.MD5	2003AC_1_F01.ZIP 2003AC_2_F01.ZIP	Copyright_Notice2003AC.txt
2003AC	UNIX format (.tgz)	November 2003	2003AC.CHK 2003AC.MD5	2003AC_1_F01.TGZ 2003AC_2_F01.TGZ	Copyright_Notice2003AC.txt
2003AB	ISO format (.ZIP)	July 2003	2003AB.CHK 2003AB.MD5	2003AB_1.ZIP 2003AB_2.ZIP	Copyright_Notice2003AB.txt
2003AB	UNIX format (.tgz)	July 2003	2003AB.CHK 2003AB.MD5	2003AB_1.TGZ 2003AB_2.TGZ	Copyright_Notice2003AB.txt
2003AA_01	ISO format (.ZIP)	January 2003	2003AA.CHK 2003AA.MD5	2003AA_1_F01.ZIP 2003AA_2_F01.ZIP	Copyright_Notice2003AA_01.txt
2003AA_01	UNIX format (.tgz)	January 2003	2003AA.CHK 2003AA.MD5	2003AA_1_F01.TGZ 2003AA_2_F01.TGZ	Copyright_Notice2003AA_01.txt
2003AA	ISO format (.ZIP)	January 2003	2003AA.CHK 2003AA.MD5	2003AA_1.ZIP 2003AA_2.ZIP	Copyright_Notice.txt
2003AA	UNIX format (.tgz)	January 2003	2003AA.CHK 2003AA.MD5	2003AA_1.TGZ 2003AA_2.TGZ	Copyright_Notice.txt
2002AD	ISO format (.ZIP)	November 2002	2002AD.CHK 2002AD.MD5	2002AD_1.ZIP 2002AD_2.ZIP	Copyright_Notice.txt 2002AD_Addendum.txt
2002AD	UNIX format (.tgz)	November 2002	2002AD.CHK 2002AD.MD5	2002AD_1.TGZ 2002AD_2.TGZ	Copyright_Notice.txt 2002AD_Addendum.txt
2002AC	ISO format (.ZIP)	September 2002	2002AC.CHK 2002AC.MD5	2002AC_1.ZIP 2002AC_2.ZIP	Copyright_Notice.txt 2002AC_Addendum.txt
2002AC	UNIX format (.tgz)	September 2002	2002AC.CHK 2002AC.MD5	2002AC_1.TGZ 2002AC_2.TGZ	Copyright_Notice.txt 2002AC_Addendum.txt
2002AB	ISO format (.ZIP)	May 2002	2002AB.CHK 2002AB.MD5	2002AB_1.ZIP 2002AB_2.ZIP	Copyright_Notice.txt 2002AB_Addendum.txt
2002AB	UNIX format (.tgz)	May 2002	2002AB.CHK 2002AB.MD5	2002AB_1.TGZ 2002AB_2.TGZ	Copyright_Notice.txt 2002AB_Addendum.txt
2002aa	ISO format (.ZIP)	April 2002	2002aa.chk 2002aa.md5	2002aa.zip	cpyright.txt readme.txt
2002aa	UNIX format (.tgz)	April 2002	2002aa.chk 2002aa.md5	2002aa.tgz	Copyright_Notice.txt README.txt

Last Reviewed: November 17, 2025