RxNorm Adds Anatomical Therapeutic Chemical Classification System. NLM Tech Bull. 2013 Jul-Aug;(393):b4.
The August release of RxNorm includes a new source - Anatomical Therapeutic Chemical Classification System (ATC). The World Health Organization (WHO) Collaborating Centre for Drug Statistics Methodology maintains ATC. ATC classifies chemical substances into fourteen anatomical groups, which are divided into three levels of pharmacological, chemical, and therapeutic subgroups. Members of these groups and subgroups include approximately 4,500 ingredients.
For more information about ATC, visit the WHO ATC page: http://www.whocc.no/atc/structure_and_principles/.