Abstract: Pulmonary hypertension (PH) is being diagnosed with increasing frequency in modern cohorts. We sought to describe exercise rehabilitation participation among patients diagnosed with PH in the Veterans Health Administration (VA) healthcare system. We used electronic health care and purchased care data from the VA's Corporate Data Warehouse, including inpatient, outpatient, laboratory, and pharmacy encounters, to identify Veterans with newly diagnosed PH from January 1, 2010, to December 31, 2016. Exercise rehabilitation participation was defined as participation in one or more sessions within the 3 months before to 1 year after diagnosis. In this study of over 100,000 incident cases of PH among veterans, overall exercise rehabilitation participation was consistently low across all etiologies of PH. However, the use of rehabilitation increased among Veterans over the 6 years examined. Patients with group 1 PAH had the lowest participation, with <3% attending. Collectively, these findings suggest an opportunity to improve the care of patients with PH. In conclusion, we found low use of exercise rehabilitation for the treatment of PH across all etiologies. A better understanding of the barriers to referral, attendance, and completion is necessary to determine strategies for improving access to exercise rehabilitation and optimizing the medical care of patients with PH.