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Unified Medical Language System® (UMLS®)

RxNorm Release Notes

February Release - 02/02/2015

This release of RxNorm is consistent with the 2014AB 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
Anatomical Therapeutic Chemical Classification System ATC 2015
Gold Standard Drug Database GS 01/08/2015
Medi-Span Master Drug Data Base MDDB 01/07/2015
Multum MediSource Lexicon MMSL 01/01/2015
Micromedex RED BOOK MMX 01/05/2015
FDA Structured Product Labels MTHSPL 01/26/2015
FDB MedKnowledge (formerly NDDF Plus) NDDF 01/07/2015
Veterans Health Administration National Drug File - Reference Terminology NDFRT 02/02/2015
NDFRT FDASPL relationships NDFRT_FDASPL 02/02/2015
NDFRT FMTSME relationships NDFRT_FMTSME 02/02/2015
Veterans Health Administration National Drug File VANDF 12/22/2014


The following sources have not been updated in this release:

Source NameSABDate Updated
Medical Subject Headings (MeSH) MSH 09/08/2014
CMS Formulary Reference File MTHCMSFRF 2014
FDA National Drug Code Directory MTHFDA 06/01/2011
US Edition of SNOMED CT (drug information) SNOMEDCT_US 07/31/2014


Data Changes

NDF-RT now contains data specifying a “virtual hierarchy” for FDA Established Pharmacologic Class [EPC] concepts by mapping them into the SNOMED CT Product and/or Substance hierarchies. In RxNorm, these mappings are represented as 'SNOMED_PARENT' and 'SNOMED_CHILD' attributes in the RXNSAT file. Conceptually, SNOMED CT hierarchies harbor FDA EPC concepts “virtually-embedded” within them. Please refer to the Concept Properties section of the revised full NDF-RT Documentation for details about the SNOMED_* properties that store these EPC-to-SNOMED-CT mappings.

Data Counts

Term Type or AttributeNumber
Active GPCKs 366
Active BPCKs 458
Active SCDs 19994
Active SBDs 11002
Active RXNORM MINs 3932
Active RXNORM INs 10362
Active RXNORM PINs 2389
Active RXNORM BNs 6818
Active RXNORM DFs 103
Obsolete GPCKs 125
Obsolete BPCKs 114
Obsolete SCDs 14593
Obsolete SBDs 10452
Obsolete RXNORM MINs 0
Obsolete RXNORM INs 0
Obsolete RXNORM PINs 0
Obsolete RXNORM BNs 9540
Obsolete RXNORM DFs 57
Editor-suppressed SCDs 1134
Editor-suppressed SBDs 988
OCD atoms 333573
Source-asserted NDCs 1336477
Distinct source-asserted NDCs 605161
Distinct SAB=RXNORM NDCs 202289

Last Reviewed: February 2, 2015