PMA Medical Specialists, a Medical Group Practice located in Phoenixville, PA. ... Nurse Practitioner; Nicholas Andrew Katzen, MD Gastroenterology, Hepatology, Internal Medicine; ... PMA Phoenixville MOB II. 826 Main St Ste 100 Phoenixville, PA 19460 (610) 933-8484. Monday : 8:30 AM - 5:00 PM:.