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Unified Medical Language System® (UMLS®)

RxNorm Release Notes

March Release - 03/05/2012

This release of RxNorm is consistent with the 2011AB 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 02/06/2012
Medi-Span Master Drug Data Base MDDB 02/08/2012
Multum MediSource Lexicon MMSL 02/01/2012
Micromedex RED BOOK MMX 02/06/2012
FDA Structured Product Labels MTHSPL 02/24/2012
First DataBank NDDF Plus Source Vocabulary NDDF 02/08/2012
Veterans Health Administration National Drug File - Reference Terminology NDFRT 03/05/2012
SNOMED Clinical Terms (drug information) SNOMEDCT 01/31/2012
Veterans Health Administration National Drug File VANDF 01/23/2012


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

Source NameSABDate Updated
Medical Subject Headings (MeSH) MSH 09/09/2011
FDA National Drug Code Directory MTHFDA 06/01/2011


Data Changes

There are no significant data changes for this release.

Data Counts

Term Type or AttributeNumber
Active GPCK forms 319
Active BPCK forms 402
Active SCD forms 20,684
Active SBD forms 17,158
Active RXNORM MIN atoms 3,734
Active RXNORM IN atoms 5,017
Active RXNORM PIN atoms 1,570
Active RXNORM BN atoms 15,685
Active RXNORM DF atoms 101
Obsolete GPCK forms 72
Obsolete BPCK forms 41
Obsolete SCD forms 13,041
Obsolete SBD forms 3,853
Obsolete RXNORM MIN atoms 0
Obsolete RXNORM IN atoms 0
Obsolete RXNORM PIN atoms 0
Obsolete RXNORM BN atoms 0
Obsolete RXNORM DF atoms 54
OCD atoms 295,942
Source-asserted NDC codes 1,054,349
Distinct Source-asserted NDC codes 495,847
SAB=RXNORM NDC codes 259,096
Distinct SAB=RXNORM NDC codes 259,096

Last Reviewed: April 23, 2012