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2008 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.* > 2008 ICD-9-CM Diagnosis 493.90 Asthma unspecified  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 Therefore, this code may be out of date.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 493.90 can be accessed here. 493.90 is a specific code that can be used to specify a diagnosis 493.90 contains 1 index entry View the ICD-9-CM Volume 1 493.* hierarchy Index entries containing 493.90: Bronchitis (diffuse) (hypostatic) (infectious) (inflammatory) (simple) 490 asthmatic (acute) 493.90 with acute exacerbation 493.92 status asthmaticus 493.91 chronic 493.2