464: Acute laryngitis and tracheitis
Excludes:
that associated with influenza (487.1, 488.02, 488.12)
that due to Streptococcus (034.0)
464.3 Acute epiglottitis
Viral epiglottitis
Excludes:
epiglottitis, chronic (476.1)
464.30: Without mention of obstruction
464.31: With obstruction
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