ICD-10 Code for Bronchiolitis

The default ICD-10-CM 2027 code for bronchiolitis (acute) (infective) (subacute) is J21.9 – Acute bronchiolitis, unspecified. More specific codes depend on the details documented, as listed in the official index (10 codes, 10 billable).

Main code: J21.9 – Acute bronchiolitis, unspecified
Billable: Yes

Index entries for Bronchiolitis

with
- bronchospasm or obstruction – J21.9
- influenza, flu or grippe – see Influenza, with, respiratory manifestations NEC
chemical (chronic) – J68.4
- acute – J68.0
chronic (fibrosing) – J44.89
- obliterative – J44.81
due to
- external agent – see Bronchitis, acute, due to
- human metapneumovirus – J21.1
- respiratory syncytial virus (RSV) – J21.0
- specified organism NEC – J21.8
fibrosa obliterans – J44.81
influenzal – see Influenza, with, respiratory manifestations NEC
obliterans – J44.81 – see also Bronchiolitis, obliterative
- with organizing pneumonia (BOOP) – J84.89
- syndrome – J44.81
obliterative (chronic) (subacute) – J44.81 – see also Bronchiolitis, obliterans
- due to chemicals, gases, fumes or vapors (inhalation) – J44.81 – see also Disease, respiratory, chronic, due to chemicals, gases, fumes or vapors
- due to fumes or vapors – J44.81 – see also Disease, respiratory, chronic, due to chemicals, gases, fumes or vapors
respiratory, interstitial lung disease – J84.115

How to choose the right code

Start with the main term, then pick the indented subterm that matches the documentation (type, cause, site, laterality, episode of care). Always confirm the code in the tabular list: follow its Excludes1/Excludes2, “code first” and “use additional code” notes, and add a 7th character where required.

Source: CDC/NCHS ICD-10-CM FY2027 alphabetic index.