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Unified Medical Language System® (UMLS®)

RxNorm Release Notes

October Release - 10/07/2013

This release of RxNorm is consistent with the 2013AA 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 09/03/2013
Medi-Span Master Drug Data Base MDDB 09/04/2013
Multum MediSource Lexicon MMSL 09/01/2013
Micromedex RED BOOK MMX 09/02/2013
FDA Structured Product Labels MTHSPL 09/26/2013
FDB MedKnowledge (formerly NDDF Plus) NDDF 09/04/2013
Veterans Health Administration National Drug File - Reference Terminology NDFRT 10/07/2013
Veterans Health Administration National Drug File VANDF 08/28/2013


The following sources have not been updated in this release:

Source NameSABDate Updated
Anatomical Therapeutic Chemical Classification System ATC 2013
Medical Subject Headings (MeSH) MSH 01/21/2013
FDA National Drug Code Directory MTHFDA 06/01/2011
US Edition of SNOMED CT (drug information) SNOMEDCT_US 07/31/2013

Data Changes

With this release, RxNorm no longer round strengths for solid dose form drugs to three significant digits. For example, 'carvedilol 3.125 MG Oral Tablet' was rounded to 'carvedilol 3.13 MG Oral Tablet' in previous releases but will be represented in the unrounded form 'carvedilol 3.125 MG Oral Tablet' now. New drugs in the October release were not rounded. Previously rounded drugs will be updated over the next few months.

Data Counts

Term Type or AttributeNumber
Active GPCK forms 332
Active BPCK forms 405
Active SCD forms 20,076
Active SBD forms 10,513
Active RXNORM MIN atoms 3,850
Active RXNORM IN atoms 9,283
Active RXNORM PIN atoms 2,186
Active RXNORM BN atoms 6,593
Active RXNORM DF atoms 104
Obsolete GPCK forms 123
Obsolete BPCK forms 104
Obsolete SCD forms 13,836
Obsolete SBD forms 10,226
Obsolete RXNORM MIN atoms 0
Obsolete RXNORM IN atoms 0
Obsolete RXNORM PIN atoms 0
Obsolete RXNORM BN atoms 9,199
Obsolete RXNORM DF atoms 51
Editor-suppressed SCD forms 1,120
Editor-suppressed SBD forms 900
OCD atoms 312,470
Source-asserted NDC codes 1,256,855
Distinct Source-asserted NDC codes 564,402
SAB=RXNORM NDC codes 191,450
Distinct SAB=RXNORM NDC codes 191,450

Last Reviewed: October 1, 2013