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J21.1

J21.1: Acute bronchiolitis due to human metapneumovirus

Billable / specific codeICD-10-CM

J21.1 is a billable, specific ICD-10-CM code for acute bronchiolitis due to human metapneumovirus. It is valid for submission on a claim.

Check J21.1 with the rest of the claim: free scrubber

Excludes2 inherited from the categories above J21.1

Not part of this code, but both may be coded when both are present.

Written on J21: Acute bronchiolitis

  • respiratory bronchiolitis interstitial lung disease (J84.115)

Other codes that can never be billed with J21.1

Their own Excludes1 notes name this code, so the conflict is not listed above.

Risk adjustment

No CMS-HCC V28 category: this code does not change a RAF score.

Medicare coverage

J21.1 is named in 5 Medicare coverage policies: 5 listing it as supporting medical necessity. Which one applies depends on your Medicare contractor.

  • A54111Billing and Coding: Speech Language Pathology (SLP) Services: Communication Disorders
  • A56717Billing and Coding: Respiratory Therapy (Respiratory Care)
  • A56730Billing and Coding: Respiratory Therapy and Oximetry Services
  • A57205Billing and Coding: Oximetry Services

Alphabetic index entries that lead here

  • Bronchiolitis›due to›human metapneumovirus

Code history

Unchanged in every release from FY2024 to FY2027.

Other codes under J21

ICD-10-CMFY2027· effective October 1, 2026

Loaded directly from the CMS/NCHS ICD-10-CM public-domain release: see data sources and our editorial policy. If this page disagrees with the CMS tabular list, this page is wrong. Reference information for professional coders; not medical or billing advice.