Table 2.

Description of features included in the model. We selected these features using an analysis of variance (ANOVA). CCS: Clinical Classifications Software; CPT: Current Procedural Terminology; LOINC: Logical Observation Identifiers Names and Codes.

Category	Features
Diagnosis codes	CCS 238 – Complications of surgical procedures or medical care; CCS 88 – Glaucoma; CCS 148 – Peritonitis and intestinal abscess; CCS 197 – Skin and subcutaneous tissue infections; CCS 223-Birth trauma
Laboratory test results	LOINC 26515-7 – Maximum platelets in blood; LOINC 2862-1 – Minimum, mean, and median albumin in serum or plasma; LOINC 20570-8 – Minimum hematocrit of blood; LOINC 718-7 – Minimum hemoglobin in blood; LOINC 26453-1 – Minimum erythrocytes in blood
Medications	Diatrizoate meglumine and sodium; Piperacillin sodium-tazobactam; Iopamidol; Sodium chloride; Magnesium sulfate; Acetaminophen; Dextrose; Parenteral electrolytes; Calcium gluconate; Multiple vitamin; Amino acid infusion; Potassium chloride; Sodium chloride; Trace minerals Cr-Cu-Mn-Se-Zn; Ondansetron HCI; Irrigation solutions physiological; Hydromorphone HCI; Calcium chloride
Microbiology results	Negative blood culture; Gram positive cocci wound culture; Negative anaerobic culture; Gram negative rods wound culture; Staphylococcus species wound culture; Negative wound culture
Procedure codes	CPT 49406 – Image-guided fluid collection drainage by catheter; CPT 99232 – Subsequent hospital care; CPT 74177 – Abdomen and pelvis CT with contrast; CPT 99152 – Initial moderate sedation services; CPT 99024 – Postoperative follow-up visit; CPT 93010 – Routine electrocardiogram with 12 leads; CPT 99233 – Subsequent hospital care; CPT 97530 – Therapeutic activities; CPT 99153 – Additional moderate sedation services; CPT 99291 – Critical care evaluation and management
Visits	Inpatient admission; Inpatient discharge
Vital signs	LOINC 8310-5 – Maximum body temperature