The forty-nine cases of psittacine birds were submitted for disease diagnosis to the Avian Disease Division of the Animal and Plant Quarantine Agency (APQA) of Korea from 2012 to 2021. On the basis of clinical manifestations and the presence of gross lesions, necropsy, bacteriological culture, virus detection and histopathological examination were performed according to an APQA diagnostic protocol. Bacterial diseases like chlamydiosis, colibacilosis, viral disease like proventricular dilatation disease, budgerigar fledgling disease (BFD), psittacine beak and feather disease and fungal infection and parasitic diseases like blackhead disease and coccidiosis were confirmed in forty-nine cases. We present here five cases report diagnosed fungal pneumonia, blackhead disease, BFD-fungal infection, BFD and psittacosis-bacterial enteritis in psittacine. Since the pathogen can be detected even in healthy parrots, histopathological diagnosis is necessary to determine the cause of death, and clinical symptoms and gross lesions must be fully considered. In addition, zoos and aviaries where large quantities of parrots are reared, these diseases can be reduced through sanitary management of the breeding environment.