Chronic obstructive pulmonary disease (COPD) is a prominent cause of illness and mortality on a global scale. In 2019, it was predicted to rank as the sixth largest cause of mortality. COPD is one of the most prevalent non-communicable illnesses in the field of pulmonology. The DECAF score (Dyspnea, Eosinopenia, Consolidation, Acidemia, and Atrial Fibrillation) is a risk stratification tool for patients with AECOPD that can be used at the bedside to guide treatment, such as hospital at home for low-risk patients. The purpose of this study is to predict the in-hospital mortality in acute exacerbation of COPD patients with modified DECAF scores. Modified DECAF score includes Dyspnea, Eosinopenia, Consolidation, Acidemia and Frequency of Hospitalization