---
oid: "2.16.840.1.113883.6.73"
asn1-notation: "{joint-iso-itu-t(2) country(16) us(840) organization(1) hl7(113883) externalCodeSystems(6) atc(73)}"
description: "World Health Organization (WHO) Anatomical Therapeutic Chemical ([ATC](https://atcddd.fhi.no/atc_ddd_index/)) classification"
last-modified: "2025-07-31"
tags: [oid-repository]
---

## OID: `2.16.840.1.113883.6.73` (last updated: 2025-07-31)

```asn1
{joint-iso-itu-t(2) country(16) us(840) organization(1) hl7(113883) externalCodeSystems(6) atc(73)}
```

### Description

World Health Organization (WHO) Anatomical Therapeutic Chemical ([ATC](https://atcddd.fhi.no/atc_ddd_index/)) classification

**Classification**: Healthcare; Identification scheme

### Supplementary information

See the [HL7NL OID register](https://hl7.nl/actuele-hl7-nl-oid-register.html).

### Child OIDs

- `2.16.840.1.113883.6.73.1`: `whoATCLevel1(1)`
- `2.16.840.1.113883.6.73.2`: `whoATCLevel2(2)`
- `2.16.840.1.113883.6.73.3`: `whoATCLevel3(3)`
- `2.16.840.1.113883.6.73.4`: `whoATCLevel4(4)`
- `2.16.840.1.113883.6.73.5`: `whoATCLevel5(5)`

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