This session will consist of 4 Pro/Con debates on challenging aspects of diagnosing and treating Idiopathic Interstitial Pneumonia (IIP) and Hypersensitivity Pneumonitis (HP). The first debate will center on whether circulating serum biomarkers are useful in guiding diagnosis and management for patients with IIP. The second will focus on the role of cryobiopsy versus surgical and transbronchial lung biopsies in diagnosis of IIP and HP. The third debate will address the role of predictive models in diagnosis of IIP and HP. The fourth will be centered on whether genetic screening should routinely be performed among patients with IIP.