Acute exacerbations of chronic obstructive pulmonary disease (AECOPDs) frequently cause patients with COPD to access the emergency department and have a negative impact on the course of the disease. The objectives of our study were: 1) describing the socio-demographic and clinical characteristics, and the clinical management, of patients with AECOPD, when they present to the emergency department; and 2) estimating the costs related to the management of these patients. We conducted a retrospective cohort study in Italy, collecting data on 4396 patients, from 34 centres. Patients had a mean (SD) age of 76,6 (10.6) years, and 61.2% of them where males. >70% of the patients had a moderate to very high comorbidity burden, and heart failure was present in 26.4% of the cohort. The 64.6% of patients were admitted to hospital wards, with a mean (SD) length of stay of 10.8 (9.8) days. The estimated cost per patient was 2617 €.