Introduction- Acute Pancreatitis is defined as an acute inflammatory process of the pancreas, caused by activation of the proteolytic enzymes within the gland. The assessment of disease severity must be objective and early detection of pancreatic necrosis is the most important aspect in its management. This study was carried out to correlate the modified CT severity index with clinical outcome of the patient. Material and methods- The descriptive, cross sectional hospital-based study was carried out in the Department of Radiodiagnosis, St. Stephen Hospital, Tis Hazari, Delhi over a period of 18 months among 100 patients who were diagnosed with acute pancreatitis. Clinical and demographic history was taken and results were analyzed using SPSS version 25.0. Results- The mean age of patients was 40.68±12.99 years. There was a male preponderance seen with a male to female ratio of 2.4:1. Gallstones were the most common cause of pancreatitis in 53.33% (24/45) of the patients. there was significant positive correlation found between MCTSI and duration of hospital stay (p value = 0.019) and BISAP score (p value = 0.030). Conclusion – It was concluded that CT examination helps diagnose acute pancreatitis. It detects pancreatic, peripancreatic, and extra-pancreatic morphological and inflammatory alterations well. MCTSI is beneficial for screening acute pancreatitis patients, accurately classifying severity, and predicting clinical prognosis.