METHODS: After IRB approval, we searched our electronic database for all patients who were seen for CAP in our emergency department and internal medicine clinics. A total of 6048 patient charts with ICD-9 and ICD-10 codes for pneumonia were identified. Of these, 748 patients were identified as CAP and were included in the study. Confusion, respiratory rate above 30, systolic blood pressure below 90 or diastolic below 60, oxygen saturation below 90% and the presence of co-morbid conditions were used to calculate the score. The 30 day mortality was used as a primary outcome. We calculated the area under the Receiver Operating Characteristic (ROC) curve and the C-statistic of the new test to measure its utility.