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J21.9

Billable

Acute bronchiolitis, unspecified

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

What This Code Means

Acute inflammation of the smallest airways in the lungs without a specified causative organism identified.

Coding Tips

  • •Use this code when acute bronchiolitis is diagnosed but the specific organism is not identified or tested
  • •This is a default code; use more specific codes (J21.0 or J21.8) if the causative organism is documented

Excludes 1 — Do NOT code together

  • chronic bronchiolitis (J44.89)

Code Hierarchy

└J21Acute bronchiolitis└J21.9Acute bronchiolitis, unspecified
└J21.9Acute bronchiolitis, unspecified

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