U.S. National Drug Code

U.S. Na·tion·al Drug Code

(NDC) (na'shŭn-ăl drŭg kōd)
A standard code used to identify drugs and biologicals that have been approved by the Food and Drug Administration.
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From this population, the authors used diagnosis codes based on data from the U.S. National Drug Code system, the European Pharmaceutical Market Research Association, and the Pharmaceutical Business Intelligence and Research Group Anatomical Classification System drug classes, along with information on dispensation of IBD medications, to select 4,344 IBD patients, each of whom was subsequently matched with 5 other patients without IBD based on age, sex, and geographic region within the United States (Northeast, North Central, South, or West), yielding 21,720 in this population.

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