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J21.1

Billable

Acute bronchiolitis due to human metapneumovirus

This code does not map to an HCC category in any model (V28, V24, ESRD, RxHCC).

What This Code Means

This is a lung infection in the small airways (bronchioles) caused by human metapneumovirus, a virus that causes sudden inflammation and swelling. It typically affects infants and young children, causing coughing, wheezing, and difficulty breathing.

Coding Tips

  • •Ensure documentation specifies human metapneumovirus as the causative agent; other viral bronchiolitis codes (J21.0, J21.8, J21.9) exist for different viral causes
  • •This code is age-specific and most commonly seen in pediatric patients; verify patient age and clinical presentation support this diagnosis

Code Hierarchy

└J21Acute bronchiolitis└J21.1Acute bronchiolitis due to human metapneumovirus
└J21.1Acute bronchiolitis due to human metapneumovirus

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