Boey Score merupakan sistem penilaian yang awalnya digunakan untuk memperkirakan morbiditas dan mortalitas pada kasus perforasi gaster. Namun, penggunaannya pada pasien peritonitis dengan etiologi beragam belum banyak diteliti./ The Boey Score is a clinical assessment tool initially developed for predicting morbidity and mortality in cases of gastric perforation. However, its applicability to peritonitis patients with various etiologies remains underexplored. Objective: This study aims to evaluate the implementation of the Boey Score in relation to surgical procedures (laparotomy or drainage) and patient survival outcomes in peritonitis cases.