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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 493.1 Intrinsic asthma 493.1 is a non-specific code that cannot be used to specify a diagnosis 493.1 contains 4 index entries View the ICD-9-CM Volume 1 493.* hierarchy 493.1 also known as: Late-onset asthma Index entries containing 493.1: Asthma, asthmatic (bronchial) (catarrh) (spasmodic) 493.9 endogenous (intrinsic) 493.1 infective 493.1 intrinsic 493.1 late-onset 493.1