ICD-10-CM 2027
ICD-10 code for intermittent mild asthma
From the official ICD-10-CM alphabetic index entry “Asthma, asthmatic (bronchial) (catarrh) (spasmodic) › intermittent (mild)”. Page updated September 29, 2026.
About coding intermittent mild asthma
The ICD-10-CM code for intermittent mild asthma is J45.20 (Mild intermittent asthma, uncomplicated). The official index lists 2 more specific codes, so check the documentation for details such as type, cause, site or severity before settling on J45.20.
Within J45.2 (mild intermittent asthma), J45.20 is specifically for mild intermittent asthma, uncomplicated. Related codes cover with (acute) exacerbation (J45.21) and with status asthmaticus (J45.22).
Use an additional code to identify: eosinophilic asthma (J82.83), exposure to environmental tobacco smoke (Z77.22), exposure to tobacco smoke in the perinatal period (P96.81), history of tobacco dependence (Z87.891), occupational exposure to environmental tobacco smoke (Z57.31) and 2 more.
It is not a CC or MCC, so as a secondary diagnosis it doesn't change the MS-DRG severity level.
More specific intermittent mild asthma codes (official index)
Common questions about intermittent mild asthma ICD-10 codes
What is the ICD-10 code for intermittent mild asthma?
- J45.20 — Mild intermittent asthma, uncomplicated. More specific codes apply when the documentation supports them: J45.21, J45.22.
Is J45.20 billable?
- Yes. J45.20 is a billable/specific ICD-10-CM code valid for FY2027 (October 1, 2026 – September 30, 2027).
Can J45.20 be used as a principal diagnosis?
- Yes. The Medicare Code Editor doesn't restrict J45.20 as a principal diagnosis.
Is J45.20 a CC or MCC?
- No. J45.20 is neither a CC nor an MCC under MS-DRG v44.0.