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Patients undergoing percutaneous coronary intervention (PCI) require dual antiplatelet therapy and some require additional anticoagulation. We aimed to investigate the incidence of acute gastrointestinal bleeding (AGIB) among PCI patients receiving antiplatelet and anticoagulant therapy.A population-based study that included all patients undergoing PCI during 2008-2016 in Iceland. Data from the Icelandic Medicines Registry were obtained on all outpatient prescriptions 1 year after first PCI. Patients receiving single or dual-antiplatelet therapy with or without anticoagulation cotherapy were analyzed. Rehospitalization for AGIB and endoscopic data were obtained within the 12-month follow-up period.A total of 5166 patients (male 75%) underwent PCI during the study period. The incidence of AGIB was 1% (54/5166) per year. The mean age among non-bleeders 65 (±11) years was lower than among bleeders 69 (±9) years (The 1-year incidence of AGIB was low with no mortality. Bleeding risk was found to be higher among patients on single antiplatelet therapy combined with anticoagulant therapy compared to patients on single antiplatelet therapy alone.