Rebecca R Saff1, Yu Li2, Nikita Santhanakrishnan3, Carlos A Camargo4, Kimberly G Blumenthal5, Li Zhou6, Aleena Banerji7. 1. Division of Rheumatology, Allergy, and Immunology, Department of Medicine, Massachusetts General Hospital, Boston, Mass; Harvard Medical School, Boston, Mass. Electronic address: rsaff@partners.org. 2. Division of Rheumatology, Allergy, and Immunology, Department of Medicine, Massachusetts General Hospital, Boston, Mass; Medical Practice Evaluation Center, Department of Medicine, Massachusetts General Hospital, Boston, Mass. 3. Boston University, Boston, Mass. 4. Division of Rheumatology, Allergy, and Immunology, Department of Medicine, Massachusetts General Hospital, Boston, Mass; Harvard Medical School, Boston, Mass; Department of Emergency Medicine, Massachusetts General Hospital, Boston, Mass. 5. Division of Rheumatology, Allergy, and Immunology, Department of Medicine, Massachusetts General Hospital, Boston, Mass; Harvard Medical School, Boston, Mass; Medical Practice Evaluation Center, Department of Medicine, Massachusetts General Hospital, Boston, Mass; Edward P. Lawrence Center for Quality and Safety, Massachusetts General Hospital, Boston, Mass. 6. Harvard Medical School, Boston, Mass; Division of General Internal Medicine, Department of Medicine, Brigham and Women's Hospital, Boston, Mass; Clinical Informatics, Partners eCare, Partners HealthCare System, Boston, Mass. 7. Division of Rheumatology, Allergy, and Immunology, Department of Medicine, Massachusetts General Hospital, Boston, Mass; Harvard Medical School, Boston, Mass.
Abstract
BACKGROUND: The study of allergic drug reactions has been limited because of challenges in identifying and confirming cases. OBJECTIVE: To determine the utility of International Classification of Diseases, Ninth Revision, Clinical Modification (ICD-9-CM) codes for identifying inpatient allergic drug reactions and to compare findings with previous data in the emergency department. METHODS: By reviewing medical records of inpatients with ICD-9-CM codes and E codes suggestive of allergic drug reactions at a large urban academic medical center, we determined codes that yielded the most drug allergy cases and identified culprit drugs. RESULTS: In 2005 and 2010, 3337 and 5282 possible allergic drug reactions during hospitalization were identified and 1367 were reviewed. Allergic drug reactions were found in 409 (30.1%) of the reviewed charts, with 172 (29.7%) in 2005 and 237 (30.5%) in 2010. The codes that identified the highest percentage of true allergic drug reactions were dermatitis due to drug (693.0), allergic urticaria (708), angioneurotic edema (995.1), and anaphylaxis (995.0). Antibiotics were the most common cause (44.4%); however, multiple drug classes were often identified as likely culprit drugs. CONCLUSION: Specific ICD-9-CM codes can identify patients with allergic drug reactions, with antibiotics accounting for almost half of true reactions. Most patients with codes 693.0, 995.1, 708, and 995.0 had allergic drug reactions, with 693.0 as the highest yield code. An aggregate of multiple specific codes consistently identifies a cohort of patients with confirmed allergic drug reactions.
BACKGROUND: The study of allergic drug reactions has been limited because of challenges in identifying and confirming cases. OBJECTIVE: To determine the utility of International Classification of Diseases, Ninth Revision, Clinical Modification (ICD-9-CM) codes for identifying inpatient allergic drug reactions and to compare findings with previous data in the emergency department. METHODS: By reviewing medical records of inpatients with ICD-9-CM codes and E codes suggestive of allergic drug reactions at a large urban academic medical center, we determined codes that yielded the most drug allergy cases and identified culprit drugs. RESULTS: In 2005 and 2010, 3337 and 5282 possible allergic drug reactions during hospitalization were identified and 1367 were reviewed. Allergic drug reactions were found in 409 (30.1%) of the reviewed charts, with 172 (29.7%) in 2005 and 237 (30.5%) in 2010. The codes that identified the highest percentage of true allergic drug reactions were dermatitis due to drug (693.0), allergic urticaria (708), angioneurotic edema (995.1), and anaphylaxis (995.0). Antibiotics were the most common cause (44.4%); however, multiple drug classes were often identified as likely culprit drugs. CONCLUSION: Specific ICD-9-CM codes can identify patients with allergic drug reactions, with antibiotics accounting for almost half of true reactions. Most patients with codes 693.0, 995.1, 708, and 995.0 had allergic drug reactions, with 693.0 as the highest yield code. An aggregate of multiple specific codes consistently identifies a cohort of patients with confirmed allergic drug reactions.
Keywords:
Adverse drug reactions; Clinical Modification (ICD-9-CM) codes; Drug allergy; Drug hypersensitivity; Epidemiology; International Classification of Diseases; Ninth Revision
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