---
id: "mesh_tree_number"
kind: "datatype"
status: "draft"
is_pii: false
categories: ["medical", "science"]
langs: ["common"]
quality: 80
url: "http://registry.apicrafter.io/datatype/mesh_tree_number"
---

# MeSH tree number (`mesh_tree_number`)

> **Draft.** Draft records have not been reviewed yet and may be incomplete or wrong; do not treat them as authoritative for legal or compliance decisions.

Position of a descriptor in the MeSH hierarchy: a letter and two digits for the top category, then groups of three digits separated by dots, such as C04.557. One descriptor can have several tree numbers.

- Personal data (PII): no
- Categories: Medical/pharma identifiers (medical), Scientific (science)
- Countries: global
- Languages: Common to most languages (common)
- Classification: categorical

## Detection

Regular expression (Python `re`):

```
^[A-Z]\d{2}(?:\.\d{3})*$
```

## Examples

- `A07.231.114.056` — aorta
- `C10.228.662.262.249.750` — Huntington's disease
- `A07` — circulatory system

## Mappings

- wikidata: `P672`

## Sources

- wikipedia: <https://en.wikipedia.org/wiki/Medical_Subject_Headings>
- wikidata: <https://www.wikidata.org/wiki/Property:P672>

## Quality

Score 80/100. Missing: negative example, translation, detector coverage.

JSON: <http://registry.apicrafter.io/api/v1/datatypes/mesh_tree_number.json> · Edit: <https://github.com/apicrafter/metacrafter-registry/edit/main/data/datatypes/any/medical/mesh_tree_number.yaml>