ICD-10 J21.0
Billable / Specific CCAcute bronchiolitis due to respiratory syncytial virus
About ICD-10-CM J21.0
ICD-10-CM code J21.0 represents Acute bronchiolitis due to respiratory syncytial virus. This is a billable/specific code in the Respiratory System chapter (block J21). The 2026 edition of ICD-10-CM J21.0 became effective on October 1, 2025.
Coding Tips for J21.0
Specialist guidance from the PayerReady Medical Coding Team. Specificity warnings, HCC capture rules, sequencing notes.
J21.0 is designated CC for MS-DRG grouping. On inpatient claims, this code can shift the DRG to the with-CC variant when documented as a present-on-admission secondary diagnosis. Hospital CDI programs flag CC opportunities during chart review. Failure to capture this code may leave 30 to 80 percent of the inpatient stay revenue unrealized.
Inclusion Terms / Approximate Synonyms
Clinical terms and conditions classified under J21.0. Per CMS ICD-10-CM Tabular 2026.
- Acute bronchiolitis due to RSV
Inpatient DRG Impact, CC
code Acute bronchiolitis due to respiratory syncytial virus. As a Complication/Comorbidity (CC), this contributes to DRG severity adjustment when documented alongside the principal diagnosis.
Medicare LCD Coverage for J21.0
Local Coverage Determinations (LCDs) from CMS MACs that list J21.0 as a covered diagnosis.
Showing top 10 of 102 total . Click a CPT for full coverage scope.
Commercial Payer Coverage
Coverage policies from major commercial payers referencing J21.0.
5 Medicare
1 Aetna
CPT Codes Commonly Billed with J21.0
Procedures frequently paired with this diagnosis based on PayerReady's Dx↔Px linkage data.
We don't have CPT pairings indexed for this specific code yet. Use the CPT search above to find common procedures, or check your payer's published medical policy for code-specific guidance.
Convert J21.0 to ICD-9-CM
Per CMS General Equivalence Mappings (GEMs), useful for legacy data review and historical claim analysis.
| ICD-10 | ICD-9 | Mapping Flags |
|---|---|---|
| J21.0 | 46611 | 00000 |
Flags format (5 digits): Approximate · No Map · Combination · Scenario · Choice List. Source: CMS 2017 GEMs (final version).
Codes Adjacent To J21.0
Other codes in section J20-J22 (Other acute lower respiratory infections).
ICD-10 J21.0, Billing FAQ
Is ICD-10 code J21.0 billable? +
Yes, J21.0 is a billable ICD-10-CM code that can appear as a primary or secondary diagnosis on claims.
What other names or terms map to J21.0? +
ICD-10 J21.0 includes: Acute bronchiolitis due to RSV.
Is J21.0 a CC or MCC for inpatient DRG? +
Yes, this code is designated as CC. Documenting as a secondary diagnosis on inpatient claims can shift the DRG to a higher-weighted category.
What ICD-9 codes does J21.0 map to? +
Per CMS GEMs, J21.0 maps to ICD-9 codes: 46611. Useful for legacy data review and historical claim analysis.
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Reviewed by the PayerReady Medical Coding Team
Verified against the CMS 2026 code set on May 31, 2026.
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