Objective: The Charlson Comorbidity Index (CCI) is a comorbidity scale used widely throughout the world. It uses patients' preoperative and intraoperative morbidity factors to evaluate morbidity and mortality risk. Though the CCI has widespread use, it has not been evaluated in patients attending at ES, and its relationship with patient readmission has not been shown previously. In this study, we aimed to show whether there is a correlation between the CCI value and the number of repeated admissions to emergency services and that the CCI value can be used as a predicted factor for the serious patients.

Matherials and Methods: This was a prospective observational cross-sectional study. Age, gender, vital signs of the patients who agreed to participate in the study was recorded. Numbers of emergency service applications in the last 6 months and CCI score have been recorded.

This study showed that CCI score can be used for identify serious patient in emergency service.

Inclusion Criteria:

• Admitted patients were told about the study, and those who agreed to participate were included

Exclusion Criteria:

• Patients who did not wish to participate in the study
• Patients who were unable to work or who had problems with consciousness
• Patients with non-hospital cardiopulmonary arrest
• Patients who had previously participated in the study (readmitted patients)
• Patients who had accessed ES for the same or a similar complaint within the last seven days
• < 18 years' old

all patients admitted to the emergency room