Table 1.

Diagnostic category classifications and definitions.

Diagnostic category	Definition
Asthma-related Illness	•Any diagnosis or disposition mentioning asthma or reactive airway disease of any severity
COVID-19-related Illness	•Any diagnosis or disposition mentioning COVID-19
Major Medical Problems	•Any exacerbation of chronic disease, (e.g. diabetes, epilepsy, lupus, cancer, sickle cell disease, etc.), excluding asthma. •Technology based medical problems (e.g. tracheostomy, gastrostomy, catheter and ventriculoperitoneal shunt related problems) •Any ESI Level 1–2 (e.g. anaphylaxis) •Any presentation requiring admission, not already meeting criteria for alternate category
Minor Medical Problems	•Any diagnoses that did not fit into any of the other categories •ESI 3–5 •Presentation did not lead to an admission
Psychiatric/Psychosocial	•Any diagnosis relating to a psychiatric or behavioral complaint (e.g. depression, suicidality, aggression) •Ingestions with a secondary psychiatric diagnosis •Diagnoses that clearly identify potential abuse (e.g. physical abuse, suspicion for abuse), eating disorders and medical screening exams
Surgical, excluding Appendicitis	•Any surgical related diagnosis or operating room disposition (e.g., small bowel obstruction, pyloric stenosis, volvulus, intussusception, hernias, T&A, orchiopexy, post-operative complications)
Trauma	•Any diagnosis that can be obviously related to an antecedent trauma, major or minor (e.g. falls, injuries, lacerations, fractures, sprains, strains, eye injuries, dental trauma, bite related injuries, nursemaid's elbow)
Appendicitis	•Appendicitis specifically mentioned as a diagnosis