A 72-year old man referred to MDD meeting with a diagnosis of sarcoidosis. HRCT pattern favored chronic HP; however, the case was deemed unclassifiable after multidisciplinary discussion as no exposure was elicited and due to the high clinical probability of IPF. The patient was referred to surgical lung biopsy that demonstrated a usual interstitial pneumonia (UIP) pattern and led to a diagnosis of IPF. The patient was subsequently started on antifibrotic treatment.