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Unified Medical Language System® (UMLS®)

RxNorm Current Prescribable Content Release Notes

September Release - 09/04/2018

This RxNorm Current Prescribable Content release is consistent with the 2018AA 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.

Data Changes

New RxNorm Attributes
The Basis of Strength Substance (BoSS) is now explicitly indicated in RxNorm allowing improved alignment with international drug data standards. The new attributes also support computation by including the product strength as discrete numerator and denominator values and units rather than as a string in the RxNorm normalized name. There are seven new attributes associated with the Semantic Clinical Drug Component (SCDC) term type (TTY) in RxNorm.

Here are the seven new attribute names (ATN) in RXNSAT associated with SCDCs in RxNorm:


Data Counts

Term Type or AttributeNumber
Active GPCKs301
Active BPCKs431
Active SCDs12716
Active SBDs8102
Active RXNORM MINs1164
Active RXNORM INs5507
Active RXNORM PINs1504
Active RXNORM BNs4381
Active RXNORM DFs113
Distinct SAB=RXNORM NDCs231629

Last Reviewed: September 10, 2018