The California Dept. of Public Health along with the Center for Disease Control require masks to be worn in ALL health care facilities. COVID is a respiratory virus; as such all staff, patients and visitors must adhere to this directive at all Riverside Medical Clinic locations. ANYONE who refuses to comply will be asked to leave the facility. Many patients treated at clinics such as RMC have health issues that put them at a higher risk. This mask policy is designed to protect all our patients.

James Sun, MD

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James Sun, MD

Office Information:

Temescal Valley
21634 Retreat Parkway
Temescal Valley, CA 92883
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Call:   (951) 493-6920
Office Hours: 8:30a-5:30p, Mon-Fri

Languages Spoken:



Ear Nose and Throat Audiology  Otolaryngological Surgery


Fellow of the American College of Surgeons

Otolaryngology - Head & Neck Surgery, Kaiser Permanente Oakland, CA - 2003

General Surgery - University of California Davis-East Bay; Oakland, CA - 1999

Columbia University, College of Physicians and Surgeons, M.D. - 1998

Cornell University, College of Agriculture and Life Sciences, B.S. Biochemistry - 1994

un, JJ, Rasgon, BM, Hilsinger, Jr., RL. Lipoblastomatosis of the neck causing hemiparesis: a case report and review of the literature. Head Neck. 2003 Apr;25(4):337-40. Sun, JJ, Rasgon, BM, Wild, TM, Hilsinger, Jr., RL. Synovial cell sarcoma of the maxillary sinus: a first reported case. Otolaryngol Head Neck Surg. 2003 Nov;129(5):587-90. Sun, JJ, Ford, LM, Rasgon, BM, Lewis, BI. Odontoma of the middle ear: case report with 25-year follow-up. Arch Otolaryngol Head Neck Surg. 2004 Oct;130(10):1223-4.

Professional Organizations:
American Academy of Otolaryngology & Head and Neck Surgery,California Medical Association, Riverside County Medical Association

Boards & Associations

American Board of Otolaryngology
Riverside Medical Clinic