2006 ICD-9-CM Volume 1 Diagnosis Codes Home > Diseases Of The Respiratory System 460-519 > Chronic Obstructive Pulmonary Disease And Allied Conditions 490-496 > Asthma 493.* > 2006 ICD-9-CM Diagnosis 493.21 Chronic obstructive asthma with status asthmaticus View the most recent version of ICD-9-CM 493.21 493.21 is a specific code that can be used to specify a diagnosis View the ICD-9-CM Volume 1 493.* hierarchy