J45 is the ICD-10 code for Asthma. It is a three-character category divided into 4 subcodes; use the subcode whenever the record supports that level of detail. It belongs to the block J40–J47 (Chronic lower respiratory diseases) in Chapter X, Diseases of the respiratory system.
- Code type
- Category (3 characters)
- Chapter
- X · J00–J99
- Classification
- WHO ICD-10, 2019 version
What J45 excludes
Conditions that look similar but belong under another code.
Subcodes of J45
J45 in national editions
Countries report with their own edition of ICD-10. Most keep the WHO code and add more specific codes beneath it.
J45Astma
DJ45Astma
J45Astma
J45Asthma bronchiale
J45Asthme
J45astma
Listed through more specific codes:
- J45.20Mild intermittent asthma, uncomplicated
- J45.21Mild intermittent asthma with (acute) exacerbation
- J45.22Mild intermittent asthma with status asthmaticus
- J45.30Mild persistent asthma, uncomplicated
- J45.31Mild persistent asthma with (acute) exacerbation
- J45.32Mild persistent asthma with status asthmaticus
- J45.40Moderate persistent asthma, uncomplicated
- J45.41Moderate persistent asthma with (acute) exacerbation
- and 4 more national subcodes
Based on the World Health Organization’s International Statistical Classification of Diseases and Related Health Problems, 10th revision (ICD-10), 2019 version, and the national editions published by each country’s health authority. This page is a reference, not coding advice; follow your national coding rules when you report.
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