The current status and problems of multidisciplinary discussions on fibrotic hypersensitivity pneumonitis at our hospital. In this study, 46 cases of chronic hypersensitivity pneumonia diagnosed at our hospital were retrospectively reviewed. The cases were evaluated according to the 2020 ATS/JRS/ALAT guidelines. Inhalant antigens were found in 23 cases (50.0%) related to birds, 10 cases (21.7%) related to residential areas, 5 cases (10.9%) of farmer's lung, 1 case (2.2%) each of wheat, mushrooms, isocyanate, talc, and 4 cases (8.7%) of unknown inhaled antigens. Histopathological examinations were performed in 32 cases. Thirty-one cases were performed using video-assisted thoracoscopic surgery and 1 case using cryobiopsy. The final diagnosis was 25 cases (54.3%) determined to be definite; 10 cases (21.7%), high confidence; 9 cases (19.6%), moderate confidence; 1 case (2.2%), low confidence; and 1 case (2.2%), not excluded. Fifteen patients diagnosed with unclassifiable interstitial pneumonia by multidisciplinary discussion before histopathological examination were finally diagnosed with chronic hypersensitivity pneumonia, indicating that antigen screening during the interview was insufficient. In conclusion, although histopathological examination is useful for the diagnosis of fibrotic hypersensitivity pneumonitis, improvement of the accuracy of antigen screening during the interview and the evaluation of inhaled antigens are considered to be future issues.