ICD-10-CM 2027
ICD-10 code for mixed asthma
From the official ICD-10-CM alphabetic index entry “Asthma, asthmatic (bronchial) (catarrh) (spasmodic) › mixed”. Page updated September 29, 2026.
About coding mixed asthma
The ICD-10-CM code for mixed asthma is J45.909 (Unspecified 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 J45.909.
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.
More specific mixed asthma codes (official index)
Common questions about mixed asthma ICD-10 codes
What is the ICD-10 code for mixed asthma?
- J45.909 — Unspecified asthma, uncomplicated. More specific codes apply when the documentation supports them: J45.901, J45.902.
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.