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Table 1 Algorithm to define presumptive events by International Classification of Diseases 9 th Revision Clinical Modification (ICD9-CM) codes associated with medical encounters within six days following vaccination.

From: Frequency of medically attended adverse events following tetanus and diphtheria toxoid vaccine in adolescents and young adults: a Vaccine Safety Datalink study

ICD9-CM code(s) Description Presumptive events defined by a diagnosis code assigned on the day of vaccination (day 0) through day 6 or by a diagnosis code assigned on day 1 through day 6
682.3, 682.8, 682.9 Cellulitis Day 1 through day 6
729.81 Limb swelling Day 1 through day 6
729.5 Pain in limb Day 1 through day 6
995.3 Allergy unspecified Day 1 through day 6
708.x Urticaria Day 1 through day 6
289.3, 683, 785.6 Lymphadenitis Day 1 through day 6
999.3 Infection following infusion or vaccination Day 0 through day 6
995.0, 999.4 Anaphylaxis Day 0 through day 6
999.5 Serum reaction Day 0 through day 6
999.9 Complication of medical care Day 0 through day 6
995.2 Adverse effect of a drug or biological substance Day 0 through day 6