Asthma

Coding system: ICD-10
Coding system release: 2019-covid-expanded
Organisation: University of Bristol
Codelist ID: bristol/asthma
Version ID: 3a558edf
Number of codes included: 6

Versions

Description

Asthma ICD-10 codes were selected based on the “Asthma exacerbation – secondary care” definition and reviewed with input from a clinical expert.

Methodology

The codelists are reviewed by Professor Jennifer Quint and Dr Hannah Whittaker, both from Imperial College London.

References

Asthma exacerbation - secondary care

Signed off by

Mengxuan Zou, (Aug. 4, 2025)

Codelists are developed by a broad community of users for individual study purposes, which may or may not meet the needs of other studies. They should not be thought of as universal definitions of a particular condition.

We don't offer any guarantees about what they do or don't identify. Users should carefully check that any codelist meets their needs, and seek clinical input where appropriate.

code	term
J45	Asthma
J450	Predominantly allergic asthma
J451	Nonallergic asthma
J458	Mixed asthma
J459	Asthma, unspecified
J46	Status asthmaticus

This page shows the search terms that were used to build the codelist. Concepts that match the search terms, but which were excluded, are in faint grey.

code: j45*

Included 5 out of 5 matching concepts.

Show matching concepts

Asthma (J45)
Asthma, unspecified (J459)
Mixed asthma (J458)
Nonallergic asthma (J451)
Predominantly allergic asthma (J450)

code: j46*

Included 1 out of 1 matching concepts.