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Unified Medical Language System® (UMLS®)

RxNorm Release Notes

September Release - 09/03/2013

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 08/05/2013
Medi-Span Master Drug Data Base MDDB 08/07/2013
Multum MediSource Lexicon MMSL 08/01/2013
Micromedex RED BOOK MMX 08/05/2013
FDA Structured Product Labels MTHSPL 08/29/2013
FDB MedKnowledge (formerly NDDF Plus) NDDF 08/07/2013
Veterans Health Administration National Drug File - Reference Terminology NDFRT 09/03/2013
US Edition of SNOMED CT (drug information) SNOMEDCT_US 07/31/2013
Veterans Health Administration National Drug File VANDF 07/19/2013


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

Data Changes

With this release, RxNorm now includes information from the US Edition of SNOMED CT, which combines the SNOMED CT International Release and the US Extension to SNOMED CT. For this reason, we changed the source abbreviation (SAB) for SNOMED CT from 'SNOMEDCT' to 'SNOMEDCT_US'.

Due to the switch from SNOMED CT International to the US Edition of SNOMED CT, we increased the size of some data fields in the RxNorm database load scripts:


  • RXNCUI.ctl
    • ver_start from char(20) to char(40)
    • ver_end from char(20) to char(40)
  • RXNSAB.ctl
    • VSAB from char(20) to char(40)
  • RxNormDDL.sql
    • RXNCUI - ver_start from varchar2(20) to varchar2(40)
    • RXNCUI - ver_end from varchar2(20) to varchar2(40)
    • RXNSAB - VSAB from varchar2(20) to varchar2(40)


  • Table_scripts_mysql_rxn.sql
    • RXNCUI - ver_start from varchar(20) to varchar(40)
    • RXNCUI - ver_end from varchar(20) to varchar(40)
    • RXNSAB - VSAB from varchar(20) to varchar(40)

If you are using your own load scripts, you need to update these data fields.

Data Counts

Term Type or AttributeNumber
Active GPCK forms 337
Active BPCK forms 413
Active SCD forms 20,094
Active SBD forms 11,068
Active RXNORM MIN atoms 3,848
Active RXNORM IN atoms 9,237
Active RXNORM PIN atoms 2,184
Active RXNORM BN atoms 6,992
Active RXNORM DF atoms 104
Obsolete GPCK forms 118
Obsolete BPCK forms 95
Obsolete SCD forms 13,791
Obsolete SBD forms 9,595
Obsolete RXNORM MIN atoms 0
Obsolete RXNORM IN atoms 0
Obsolete RXNORM PIN atoms 0
Obsolete RXNORM BN atoms 8,762
Obsolete RXNORM DF atoms 51
Editor-suppressed SCD forms 1,100
Editor-suppressed SBD forms 912
OCD atoms 311,857
Source-asserted NDC codes 1,252,381
Distinct Source-asserted NDC codes 561,996
SAB=RXNORM NDC codes 194,357
Distinct SAB=RXNORM NDC codes 194,357

Last Reviewed: September 3, 2013