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Purpose: In the present study, the possibility of predicting mortality with the change in coagulation parameters depending on the severity of Covid-19-associated pneumonia was investigated. Materials and Methods: A total of 137 patients with Covid-19-associated pneumonia were included in the study. The patients were divided into three groups according to the severity of pneumonia as mild, moderate and severe. According to the severity of pneumonia, the parameters of complete blood count and the levels of biochemical parameters were compared between the groups. By examining blood parameters according to mortality, ROC analysis and regression analysis were performed to determine the net effect of these parameters on mortality. Results: As the severity of pneumonia increased, Prothrombin time (PT), International normalized ratio (INR) and Activated partial thromboplastin time (aPTT) values were also increased, and a statistically significant difference was found between the groups in PT and INR values. PT, INR and aPTT levels were higher in cases with mortality. Mortality can be predicted with 93.5% sensitivity and 97.5% specificity. according to the >45.1 seconds(sec) cut-off value of the coagulation parameter (aPTT+PT. Conclusion: The coagulation parameter (aPTT + PT), whose level increases secondarily to the increase in Covid-19-associated pneumonia severity, provides successful results in predicting mortality, and may be a parameter that we can recommend in clinical use.