New Search Ray J Hsiao MD (626) 854-7866 Primary Specialties Internal Medicine Date Appointed 3/31/1998 Primary Office Address: 1850 S. Azusa Ave. #308 Hacienda Heights, CA 91745-6854 Phone: (626) 854-7866 Fax: (626) 208-0021 Recommend this Physician Get Directions Areas of Expertise Internal Medicine