Acute bronchiolitis (J21) ICD-10-CM
The J21 code range covers acute bronchiolitis with 5 ICD-10-CM diagnosis codes. 4 of them are billable and valid for claim submission in fiscal year 2027, and the category headers group them but cannot themselves be billed.
Includes
This note appears immediately under a three character code title to further define, or give examples of, the content of the category.
- acute bronchiolitis with bronchospasm
Type 2 Excludes
A type 2 excludes note represents "Not included here". An excludes2 note indicates that the condition excluded is not part of the condition represented by the code, but a patient may have both conditions at the same time. When an Excludes2 note appears under a code, it is acceptable to use both the code and the excluded code together, when appropriate.
- respiratory bronchiolitis interstitial lung disease J84.115
Codes in the J21 Range 5 codes · 4 billable
Clinical Terms in This Code Range
Definitions from the National Library of Medicine for conditions coded in the J21 range.
Acute Bronchiolitis
Acute inflammation of the bronchioles usually caused by the respiratory syncytial virus.
Bronchiolitis
Inflammation of the BRONCHIOLES.
About the J21 Code Range
Acute bronchiolitis is inflammation of the bronchioles, the small airways in the lungs.
J21 divides the condition by the organism named as its cause. J21.0 names respiratory syncytial virus, and J21.1 names human metapneumovirus. J21.8 covers other specified organisms; J21.9 is acute bronchiolitis without further specification.
Questions About This Page
How many billable codes are in the J21 range?
Of the 5 codes in this range, 4 are billable and valid for claim submission from October 1, 2026 through September 30, 2027. Category header codes group them but cannot be reported on claims.
What does the J21 range classify?
The range classifies acute bronchiolitis. Each code links to its own reference page with billing status, MS-DRG grouping, coding notes, and clinical information.
Related References
Source: CMS FY 2027 ICD-10-CM Tabular List and order file, effective October 1, 2026 through September 30, 2027.
