# Anatomical Therapeutic Chemical Classification (ATC)

> The Anatomical Therapeutic Chemical (ATC) Classification System is used for the classification...

- Page: https://library.schematica.io/model/0a7b784f077a44c69549a38bfef7ca7a
- Model type: Ontology
- License: CC0 1.0
- Access type: Free
- Access method: Download
- Model size: Mid
- Formats: UMLS
- Domains: Healthcare
- External link: https://bioportal.bioontology.org/ontologies/ATC
- Contact: WHO Collaborating Centre for Drug Statistics Methodology (whocc@fhi.no)
- Listed in library: 2025-06-12
- Last updated: 2025-09-10

## Description

## Ontology Info

| Field | Value |
|-------|-------|
| Acronyme | ATC |
| Description | The Anatomical Therapeutic Chemical (ATC) Classification System is used for the classification of 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), and was first published in 1976.  |
| Format | UMLS |
| Categories | Health, Chemical |
| Groups | Unified Medical Language System |

## Metrics

| Metric | Value |
|--------|-------|
| Classes | 6,934 |
| Individuals | 0 |
| Properties | 3 |
| Max Depth | 7 |
| Max Child Count | 37 |
| Average Child Count | 5 |
| Classes With One Child | 211 |
| Classes With More Than 25 Children | 19 |
| Classes With No Definition | 6,934 |

## Projects using ATC

- [PractiKPharma](https://bioportal.bioontology.org/projects/PractiKPharma)
- [Mapping of Norwegian national quality registries- Variabelbibliotek for medisinske kvalitetsregistre](https://bioportal.bioontology.org/projects/RegMap)

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Source: https://library.schematica.io/model/0a7b784f077a44c69549a38bfef7ca7a