ICD-9 code 493.00 for Extrinsic asthma unspecified is a medical classification as listed by WHO under the range -CHRONIC OBSTRUCTIVE PULMONARY DISEASE AND ALLIED CONDITIONS (490-496).
allergic with stated cause
Hay fever with asthma
allergic NOS (493.9)
Excludes: wheezing NOS (786.07)
The following fifth-digit subclassification is for use with category 493.0-493.2, 493.9:
1 with status asthmaticus
2 with (acute) exacerbation
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