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Unified Medical Language System® (UMLS®)

RxNorm Release Notes

May Release - 05/07/2012

This release of RxNorm is consistent with the 2012AA UMLS Metathesaurus release. For additional information about RxNorm releases, including scripts for loading the RxNorm data into Oracle and MySQL databases, read the RxNorm technical documentation.


The following sources have been updated since the previous RxNorm release:

Source NameSABDate Updated
Gold Standard Drug Database GS 03/29/2012
Medi-Span Master Drug Data Base MDDB 03/28/2012
Multum MediSource Lexicon MMSL 04/01/2012
Micromedex RED BOOK MMX 03/26/2012
Medical Subject Headings (MeSH) MSH 02/01/2012
FDA Structured Product Labels MTHSPL 04/26/2012
FDB MedKnowledge (formerly NDDF Plus) NDDF 03/28/2012
Veterans Health Administration National Drug File - Reference Terminology NDFRT 05/07/2012
Veterans Health Administration National Drug File VANDF 03/22/2012


The following sources have not been updated since the previous RxNorm release:

Source NameSABDate Updated
FDA National Drug Code Directory MTHFDA 06/01/2011
SNOMED Clinical Terms (drug information) SNOMEDCT 01/31/2012


Data Changes

There are no significant data changes for this release.

Data Counts

Term Type or AttributeNumber
Active GPCK forms 322
Active BPCK forms 406
Active SCD forms 20,726
Active SBD forms 17,100
Active RXNORM MIN atoms 3,739
Active RXNORM IN atoms 5,017
Active RXNORM PIN atoms 1,572
Active RXNORM BN atoms 15,777
Active RXNORM DF atoms 102
Obsolete GPCK forms 71
Obsolete BPCK forms 42
Obsolete SCD forms 12,961
Obsolete SBD forms 3,821
Obsolete RXNORM MIN atoms 0
Obsolete RXNORM IN atoms 0
Obsolete RXNORM PIN atoms 0
Obsolete RXNORM BN atoms 0
Obsolete RXNORM DF atoms 53
OCD atoms 297,349
Source-asserted NDC codes 1,063,612
Distinct Source-asserted NDC codes 500,879
SAB=RXNORM NDC codes 263,941
Distinct SAB=RXNORM NDC codes 263,941

Last Reviewed: May 7, 2012