In general acute pancreatitis is classified in to mild and severe pancreatitis. Mild pancreatitis is also known as oedematous or interstitial pancreatitis, which is the cause for mild organ failure and uneventful recovery. Severe pancreatitis also known as necrotizing pancreatitis is associated with organ failure and leads to other complications like necrosis, infection and pseudo cyst formation.Fifty cases of acute pancreatitis who presented to the emergency department as acute abdomen were included in the study. Informed and written consent was taken from all the participants. When the Modified CT Severity Index was applied, the average duration of hospital stay in patients categorized as mild pancreatitis was 1.5 days in moderate pancreatitis 6.9 days and in severe pancreatitis 14.2 days. None of the patients categorized as mild pancreatitis had an adverse or fatal outcome. The majority (90%) of patients requiring interventional procedure fell in the severe pancreatitis group.