Proton pump inhibitor (PPI) use by indication (A), ordering provider (B), and duration (C) in 104 (59.1%) patients who had PPI exposure from 3 months prior to ICI initiation until ICI colitis, death, or last ICI infusion, whichever occurred first. GERD: gastroesophageal reflux disease, PUD: peptic ulcer disease, GIB: gastrointestinal bleeding, ICI: immune checkpoint inhibitor, ICU: intensive care unit. *Other indications include diarrhea, nausea, abdominal pain, and GI prophylaxis on medical/surgical wards.