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Unified Medical Language System® (UMLS®)

RxNorm Release Notes

September Release - 09/06/2011

This release of RxNorm is consistent with the 2011AA UMLS Metathesaurus release. For additional information about RxNorm releases, including scripts for loading the RxNorm data into Oracle and MySQL databases, read the RxNorm Documentation.


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

Source NameSABDate Updated
Gold Standard Alchemy GS 08/02/2011
Medi-Span Master Drug Data Base MDDB 08/03/2011
Multum MediSource Lexicon MMSL 08/01/2011
Micromedex RED BOOK MMX 08/01/2011
FDA Structured Product Labels MTHSPL 08/26/2011
First DataBank NDDF Plus Source Vocabulary NDDF 08/03/2011
Veterans Health Administration National Drug File - Reference Terminology NDFRT 09/06/2011
SNOMED Clinical Terms (drug information) SNOMEDCT 07/31/2011
Veterans Health Administration National Drug File VANDF 07/29/2011


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

Source NameSABDate Updated
Medical Subject Headings (MeSH) MSH 02/14/2011
FDA National Drug Code Directory MTHFDA 06/01/2011


Data Changes

This release includes new branded drug information with NDCs, which was recently contributed by Micromedex (MMX). The new NDCs, along with their RxNorm normalized versions, can be found as attributes in the RXNSAT.RRF file.

This release also includes a new attribute, ATN=RXN_PRESCRIBABLE with ATV=Y, which denotes the RxCUIs that are part of the Current Prescribable Content subset. Both the RxNorm full release and the Current Prescribable Content subset include the new attribute.

Data Counts

Term Type or AttributeNumber
Active GPCK forms 314
Active BPCK forms 390
Active SCD forms 20,042
Active SBD forms 16,996
Active RXNORM MIN atoms 3,690
Active RXNORM IN atoms 4,997
Active RXNORM PIN atoms 1,569
Active RXNORM BN atoms 15,388
Active RXNORM DF atoms 100
Obsolete GPCK forms 66
Obsolete BPCK forms 41
Obsolete SCD forms 13,248
Obsolete SBD forms 3,899
Obsolete RXNORM MIN atoms 0
Obsolete RXNORM IN atoms 0
Obsolete RXNORM PIN atoms 0
Obsolete RXNORM BN atoms 0
Obsolete RXNORM DF atoms 55
OCD atoms 286,363
Source-asserted NDC codes 1,027,971
Distinct Source-asserted NDC codes 483,159
SAB=RXNORM NDC codes 250,238
Distinct SAB=RXNORM NDC codes 250,238

Last Reviewed: September 6, 2011