Group 3 pulmonary HTN,”Lung disease +/- chronic hypoxemiaCauses: ILD, COPD June 22, 2017 mfadmin Medicine Average Rating 0 out of 5 stars. 0 votes.You must log in to submit a review. Group 3 pulmonary HTN,”Lung disease +/- chronic hypoxemiaCauses: ILD, COPD OSA”