ICD-10-CM 2027
ICD-10 code for asthma
Confirmed by the official ICD-10-CM index entry “bronchitis (diffuse) (fibrinous) (hypostatic) (infective) (membranous) › asthmatic”. Page updated September 29, 2026.
About coding asthma
The ICD-10-CM code for asthma is J45.909 (Unspecified asthma, uncomplicated). The official index lists 17 more specific codes, so check the documentation for details such as type, cause, site or severity before settling on J45.909.
Within J45.90 (unspecified asthma), J45.909 is specifically for unspecified asthma, uncomplicated. Related codes cover with (acute) exacerbation (J45.901) and with status asthmaticus (J45.902).
The conditions in its Excludes2 note aren't part of J45.909, but may be coded alongside it if the patient has both: lung diseases due to external agents (J60-J70).
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.
Related Asthma codes
- J45.20 Mild intermittent asthma, uncomplicated
- J45.21 Mild intermittent asthma with (acute) exacerbation
- J45.22 Mild intermittent asthma with status asthmaticus
- J45.30 Mild persistent asthma, uncomplicated
- J45.31 Mild persistent asthma with (acute) exacerbation
- J45.32 Mild persistent asthma with status asthmaticus
- J45.40 Moderate persistent asthma, uncomplicated
- J45.41 Moderate persistent asthma with (acute) exacerbation
- J45.42 Moderate persistent asthma with status asthmaticus
- J45.50 Severe persistent asthma, uncomplicated
- J45.51 Severe persistent asthma with (acute) exacerbation
- J45.52 Severe persistent asthma with status asthmaticus
- J45.901 Unspecified asthma with (acute) exacerbation
- J45.902 Unspecified asthma with status asthmaticus
- J45.990 Exercise induced bronchospasm
- J45.991 Cough variant asthma
- J45.998 Other asthma
Common questions about asthma ICD-10 codes
What is the ICD-10 code for asthma?
- J45.909 — Unspecified asthma, uncomplicated. More specific codes apply when the documentation supports them: J45.20, J45.21, J45.22, J45.30 and others below.
What is the ICD-10 code for mild intermittent asthma, uncomplicated?
- J45.20 — Mild intermittent asthma, uncomplicated.
What is the ICD-10 code for mild intermittent asthma with (acute) exacerbation?
- J45.21 — Mild intermittent asthma with (acute) exacerbation.
What is the ICD-10 code for mild intermittent asthma with status asthmaticus?
- J45.22 — Mild intermittent asthma with status asthmaticus.
What is the ICD-10 code for mild persistent asthma, uncomplicated?
- J45.30 — Mild persistent asthma, uncomplicated.
What is the ICD-10 code for mild persistent asthma with (acute) exacerbation?
- J45.31 — Mild persistent asthma with (acute) exacerbation.
What is the ICD-10 code for mild persistent asthma with status asthmaticus?
- J45.32 — Mild persistent asthma with status asthmaticus.
Is J45.909 billable?
- Yes. J45.909 is a billable/specific ICD-10-CM code valid for FY2027 (October 1, 2026 – September 30, 2027).
Can J45.909 be used as a principal diagnosis?
- Yes. The Medicare Code Editor doesn't restrict J45.909 as a principal diagnosis.
Is J45.909 a CC or MCC?
- No. J45.909 is neither a CC nor an MCC under MS-DRG v44.0.