ICD-9-CM Coding of Emergency Department Visits for Food and Insect Sting Allergy
Emergency Service, Hospital
Insect Bites and Stings
Almost half the patients with food allergy would have been missed by using food-specific ICD-9-CM codes alone, whereas only 13% of patients with insect sting allergy would have been missed. Furthermore, characteristics of these allergy patients would have been biased by studying only patients identified by using the allergen-specific ICD-9-CM codes.