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2007 ICD-9-CM Volume 1 Diagnosis Codes Home > Diseases Of The Respiratory System 460-519 > Acute Respiratory Infections 460-466 > Acute Bronchitis And Bronchiolitis 466.* > 2007 ICD-9-CM Diagnosis 466.1 Acute bronchiolitis  On October 1, 2008 the 2009 ICD-9-CM codes came into effect. Therefore, this code may be out of date. The 2009 version of ICD-9-CM 466.1 can be accessed here. Inflammation of the bronchioles. 466.1 is a non-specific code that cannot be used to specify a diagnosis View the ICD-9-CM Volume 1 466.* hierarchy 466.1 also known as: Bronchiolitis (acute) Capillary pneumonia