This research is taking place at the Ralph H. Johnson VAMC and surrounding Community-Based Outpatient Clinics (CBOCs). This study is examining the effectiveness of PE-PC in VHA primary care mental health integration (PCMHI) clinics. We will randomize Veterans presenting in VA PC with chronic PTSD who meet minimal inclusion/exclusion criteria to receive PE-PC (four, 30-minute weekly sessions) or PCMHI treatment as usual.