ICD-10 Code for Bronchiolitis
Also indexed as (acute) (infective) (subacute)
The ICD-10-CM code for bronchiolitis is J21.9 — Acute bronchiolitis, unspecified. This is the code the Alphabetic Index gives for bronchiolitis with no further qualifier, valid for FY2027 (October 1, 2026 – September 30, 2027).
J21.9 is billable but unspecified. If the documentation names a type, site or cause, one of the more specific codes below is likely expected.
Which bronchiolitis code should you use?
The Alphabetic Index lists 10 codes under Bronchiolitis. Which one applies depends on the qualifier documented in the record — the type, site, cause, or associated condition. Find the qualifier below, then verify the code in the Tabular List before using it.
By type
| chemical | J68.4 | Chronic respiratory conditions due to chemicals, gases, fumes and vapors | |
| chronic | J44.89 | Other specified chronic obstructive pulmonary disease | |
| fibrosa obliterans | J44.81 | Bronchiolitis obliterans and bronchiolitis obliterans syndrome | |
| obliterans | J44.81 | Bronchiolitis obliterans and bronchiolitis obliterans syndrome | |
| obliterative | J44.81 | Bronchiolitis obliterans and bronchiolitis obliterans syndrome | |
| respiratory, interstitial lung disease | J84.115 | Respiratory bronchiolitis interstitial lung disease |
Bronchiolitis with
| bronchospasm or obstruction | J21.9 | Acute bronchiolitis, unspecified |
Bronchiolitis chemical
| acute | J68.0 | Bronchitis and pneumonitis due to chemicals, gases, fumes and vapors |
Bronchiolitis chronic
| obliterative | J44.81 | Bronchiolitis obliterans and bronchiolitis obliterans syndrome |
Bronchiolitis due to
Bronchiolitis obliterans
Index terms and codes are reproduced from the official ICD-10-CM FY2027 release. The Alphabetic Index is a finding aid — a code must always be verified in the Tabular List before it is reported. Data sources