New Search Ray J Hsiao MD (626) 820-0603 Primary Specialties Internal Medicine Date Appointed 3/31/1998 Primary Office Address: 1850 S. Azusa Ave. #308 Hacienda Heights, CA 91745-6854 Phone: (626) 820-0603 Fax: (626) 820-0602 Recommend this Physician Get Directions Areas of Expertise Internal Medicine