Vocab. ATC

ATC

The Anatomical Therapeutic Chemical (ATC) Classification System is a drug classification system that classifies the active ingredients of drugs according to the organ or system on which they act and their therapeutic, pharmacological, and chemical properties. It is controlled by the World Health Organization Collaborating Centre for Drug Statistics Methodology (WHOCC).

In as much as the ATC codes are semantic identifiers, the ATC vocabulary was taken as a basis for the OMOP Drug hierarchy.

As of 30 September 2021, there are 6497 valid codes in the ATC.

Sources

ATC source codes are obtained from the current WHOCC ATC/DDD Index and, in OMOP, stored in the table of https://drive.google.com/drive/folders/1DmMy4XC-hyjblIy0WSWFtnhcz22wgHDH?usp=sharing

Domains

All ATC concepts belong to the “Drug” domain.

Concept Classes

concept_class_id	description
ATC 1st	Anatomical main group
ATC 2nd	Therapeutic subgroup
ATC 3rd	Pharmacological subgroup
ATC 4th	Therapeutic/pharmacological/chemical subgroup
ATC 5th	Chemical substance subgroup (ingredients or combinations)