Percentages do not sum to 100% as cases could meet multiple criteria. Readmissions with potentially planned procedures were considered unplanned if the principal diagnosis CCS code was acute. A) exclusion criteria; B) unplanned 7-day readmission definition; C) unplanned 30-day readmission definition. “Flagged” readmissions were for scheduled chemotherapy, radiation therapy, or dialysis treatment; same-day transfer to psychiatric facility, oncology ward, or inpatient rehabilitation; alcohol and drug treatment admission; or cases for childbirth labor and delivery. N = 2,910 index visit related to psych/rehabilitation; N = 25,900 had presence of cancer CCS code; N = 10,251 discharged as a transfer; N = 2,839 discharged AMA; N = 294 discharge unknown. CCS = clinical classification software; AMA = against medical advice; UHC = University HealthSystem Consortium.