ICD-10-CM 2027
ICD-10 code for Catarrhal bronchitis
From the official ICD-10-CM alphabetic index entry “Bronchitis (diffuse) (fibrinous) (hypostatic) (infective) (membranous) › catarrhal (l5 years of age and above)”. Page updated September 29, 2026.
About coding Catarrhal bronchitis
The ICD-10-CM code for Catarrhal bronchitis is J40 (Bronchitis, not specified as acute or chronic). The official index lists 2 more specific codes, so check the documentation for details such as type, cause, site or severity before settling on J40.
Don't report J40 together with the conditions in its Excludes1 note: acute bronchitis (J20.-), allergic bronchitis NOS (J45.909), asthmatic bronchitis NOS (J45.9-) and bronchitis due to chemicals, gases, fumes and vapors (J68.0).
Use an additional code to identify: 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), tobacco dependence (F17.-) and 1 more.
It is not a CC or MCC, so as a secondary diagnosis it doesn't change the MS-DRG severity level.
More specific Catarrhal bronchitis codes (official index)
Don't confuse with (Excludes1 for J40)
Common questions about Catarrhal bronchitis ICD-10 codes
What is the ICD-10 code for Catarrhal bronchitis?
- J40 — Bronchitis, not specified as acute or chronic. More specific codes apply when the documentation supports them: J41.0, J20.9.
What is the ICD-10 code for chronic catarrhal bronchitis?
- J41.0 — Simple chronic bronchitis.
Is J40 billable?
- Yes. J40 is a billable/specific ICD-10-CM code valid for FY2027 (October 1, 2026 – September 30, 2027).
Can J40 be used as a principal diagnosis?
- Yes. The Medicare Code Editor doesn't restrict J40 as a principal diagnosis.
Is J40 a CC or MCC?
- No. J40 is neither a CC nor an MCC under MS-DRG v44.0.