This page lists UMLS Metathesaurus data elements and traces them back to the specific source data that populates them.
RxNorm, a standardized nomenclature for clinical drugs, is produced by the National Library of Medicine. Data files are released monthly and available by download. Within each Metathesaurus cycle, RxNorm is updated multiple times. This document reflects the latest cumulative update. The scope of RxNorm is determined by the combined scope of its source vocabularies which include the following:
|ATC_2019||Anatomical Therapeutic Chemical Classification System|
|GS_2019_02_05||Gold Standard Drug Database|
|MMSL_2019_02_01||Multum MediSource Lexicon|
|MMX_2019_02_04||Micromedex RED BOOK|
|MTHCMSFRF_2014_19_03_04||Metathesaurus CMS Formulary Reference File|
|MTHSPL_2019_02_22||Metathesaurus FDA Structured Product Labels|
|USP_2018_12_10_19_03_04||USP Compendial Nomenclature|
|VANDF_2019_02_01||Veterans Health Administration National Drug File|
Dropped term type(s) (TTY) | Source(s):
Dropped attribute name(s) (ATN) | Source(s):
Dropped relationship attribute(s) (RELA) | RELA inverse(s) | Source(s):
RXNORM data files are released monthly and available by download.
|RXNCONSO.RRF||Concept and source information.|
|RXNREL.RRF||Relationship and merge information.|
|RXNSTY.RRF||Semantic type information.|
|RXNATOMARCHIVE.RRF||Archive data. Not used.|
|RXNCUICHANGES.RRF||CUI changes. Not used.|
Term types are extracted from field 13 of RXNCONSO.RRF.
For many RxNorm and subsource termtypes, the suppressibility value can be either "O" or "N". For all others, the value is "N". Suppressibility values are extracted from field 17 of RXNCONSO.RRF.
In addition, source NDC attributes may have SUPPRESS="O".
All attribute names and their values are extracted from field 9 and 11 of RXNSAT.RRF except for RXCUI and RXAUI which are created using RXNCONSO.RRF.
There are no DEFINITIONS with SAB = "RXNORM". NDFRT does contribute a small number of DEFINITIONS to MRDEF.RRF.
All relationships are extracted from field 4 (REL) and field 8 (RELA) of RXNREL.RRF
Note: In the table below, where reasonable we have
supplied term types involved in the listed
relationships. For sources that do not have "semantic
term types" (e.g. NDFRT uses "HT" and "PT," which are based on
the structure of the source, rather than types like "IN" which
is derived from the meaning of the concept), these term types
may not apply.
Inverse Relationship Label
|(no rela)||CREATED from the "PAR" relationships in
Currently, NDFRT is the only RXNORM source with a hierarchy.
|Connects the "SBD", "SCD" with its drug delivery device.|
|Connects the "PIN" with its "IN".|
|Creates relationships using the "SBD" or "SCD".|
|Connects the branded name with the generic or clinical name.|
|Connects the "PT" with its clinical drug name and connects the "SCD" & "SBD" to its drug form.|
|Connects the "BN" with its "PIN".|
|Connects the "SCDC" with its "PIN".|
|Connects the "SCD", "SBD" with its drug component.|
|Connects "GN" atoms with other "GN" atoms.|
|Connects the "SCDG" and "SBDG" with the dose form group.|
|Connects the "SCD", "SCDF", "SBD", and "SBDF" with the dose form.|
|Connects the drug name with its Metathesaurus created name.|
|Connects the "SCDF", "SCDC" to its ingredients; connects the "SBD", "SBDC", "SBDF" to its fully-specified drug brand name.|
|Connects "SCD" with "MIN"|
|Connects a concept of "DRUG_KIND" with a concept of "DISEASE_KIND"|
|Connects a concept of "MECHANISM_OF_ACTION_KIND" with a concept of "DRUG_KIND"|
|Connects a concept of "PHARMACOKINETICS_KIND" with a concept of "DRUG_KIND"|
|Connects "IN" or "PIN" with "MIN"|
|Connects "PIN" with "SCDC"|
|Creates relationships using "BN".|
|RXNORM||SY||(no rela)||Connects RXNORM atoms to other sources|
There are no mappings present in RxNorm.