About Blair Medical Associates. Blair Medical Associates is a group practice with 4 locations. Currently, Blair Medical Associates's 74 physicians cover 25 specialty areas of medicine. ... Upmc Altoona Blair Medical Associates. 800 S Logan Blvd Ste 1100 Hollidaysburg, PA 16648 (814) 947-4300. Monday : 8:30 AM - 4:30 PM: Tuesday : 8:30 AM - 4:30 ....