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_2022_22_09_06||Anatomical Therapeutic Chemical Classification System|
|GS_2022_08_05||Gold Standard Drug Database|
|MMSL_2022_08_01||Multum MediSource Lexicon|
|MMX_2022_08_08||Micromedex RED BOOK|
|MTHCMSFRF_2020_22_09_06||Metathesaurus CMS Formulary Reference File|
|MTHSPL_2022_08_26||Metathesaurus FDA Structured Product Labels|
|USP_2022_08_12||USP Compendial Nomenclature|
|VANDF_2022_07_29||Veterans Health Administration National Drug File|
Note: Selected portions of MSH and SNOMEDCT are included in the RxNorm release files, however, they are not processed as part of RxNorm for the Metathesaurus except in assigning RXCUI and RXAUI attributes. All MSH or SNOMEDCT data in the Metathesaurus comes directly from that source's data files. This document describes how the RxNorm release files (RXN*RRF) are processed for representation in the UMLS Metathesaurus. It does not cover processing of individual source vocabularies for inclusion in RxNorm.
RXNORM data files are released monthly and available by download.
|RXNCONSO.RRF||Concept and source information.|
|RXNREL.RRF||Relationship information, including synonymy|
|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 "E". 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" or "Y".
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.
All relationships are extracted from field 4 (REL) and field 8 (RELA) of RXNREL.RRF
For detailed information on relationships, see RxNorm documentation
There are no mappings present in RxNorm.