ICD-10-CM
ICD-10 code for Bronchiolitis: J21.9
The ICD-10-CM index points "Bronchiolitis" to J21 (Acute bronchiolitis), a header that is not billable. When nothing more specific is documented, the billable code is J21.9, Acute bronchiolitis, unspecified.
Source: CDC ICD-10-CM FY2027 Alphabetic Index file dated June 16, 2026. Publisher page
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Index subterms
A header groups codes and is not billed. A billable code is one you can report.
- J68.4chemical (chronic), Chronic respiratory conditions due to chemicals, gases, fumes and vaporsBillable
- J44.89chronic (fibrosing), Other specified chronic obstructive pulmonary diseaseBillable
- J44.81fibrosa obliterans, Bronchiolitis obliterans and bronchiolitis obliterans syndromeBillable
- J44.81obliterans, Bronchiolitis obliterans and bronchiolitis obliterans syndromeBillable
- J44.81obliterative (chronic) (subacute), Bronchiolitis obliterans and bronchiolitis obliterans syndromeBillable
- J84.115respiratory, interstitial lung disease, Respiratory bronchiolitis interstitial lung diseaseBillable
More specific codes in J21
A header groups codes and is not billed. A billable code is one you can report.
Excludes1
Excludes1 means these codes are not reported together.
Excludes2
Excludes2 means the other condition can be reported with this one when both are documented.
From J21. A note on a category applies to every code under it.
Related conditions
Related pages
- J21.9 code detailsNotes, nearby codes, CMS-HCC group
- Category J21Every code under it
- Chapter 10Diseases of the respiratory system
- ICD-10 codes by conditionA to Z
- Check a list of ICD-10 codes
- Denial code CO-11Diagnosis does not support the procedure
- Denial code CO-146Diagnosis invalid for the date of service
- HCPCS Level II code lookup
Questions
What is the ICD-10 code for Bronchiolitis?
The ICD-10-CM index points "Bronchiolitis" to J21 (Acute bronchiolitis), a header that is not billable. When nothing more specific is documented, the billable code is J21.9, Acute bronchiolitis, unspecified.
Is J21.9 billable?
Yes. J21.9 is a billable code in the FY2027 ICD-10-CM file. Use a more specific code when the record documents one.
What documentation notes apply to J21.9?
The CDC tabular list gives 1 Excludes1 note (not coded together), 1 Excludes2 note (may be coded together when both are documented) for J21.9 and the categories above it. They are listed on this page.
What chapter is J21.9 in?
Chapter 10. Diseases of the respiratory system.
When do ICD-10-CM codes change?
Every October 1, with the new fiscal year file. Some years add April 1 updates. This page uses the FY2027 file, effective October 1, 2026.