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David Zebrack, DO, is a conscientious and friendly primary care physician and founder of Temecula Valley Primary Care Physicians. He has been in practice for more than 20 years and has cared for patients in Temecula, California, since 2004.

Dr. Zebrack began his education at UCLA where he earned his bachelor’s degree in psychobiology. He then went on to complete his medical education at the College of Osteopathic Medicine of the Pacific in Pomona, California. After earning his doctorate, Dr. Zebrack completed a one-year rotating internship at Rio Hondo Hospital in Downey, California, and a three-year family practice residency at San Bernardino County Medical Center in San Bernardino, California.

During his postgraduate training, Dr. Zebrack served as the president of his residency program. He has held various leadership positions over the years and has enjoyed mentoring medical students. Upon earning his board certification in family medicine, Dr. Zebrack joined a multispecialty medical group in Torrance, California.

In 2004, Dr. Zebrack relocated with his family to Temecula, California, where he joined Dr. Douglas Wise and eventually founded Temecula Valley Primary Care Physicians. In addition to his primary care practice, Dr. Zebrack has acted as a preceptor to train medical students, participated in research and clinical trials, and served as the department chief of family medicine at Southwest Healthcare System in Wildomar, California.

When he is out of the office, Dr. Zebrack has been a fundraiser for the United Jewish Welfare Fund and served multiple terms on the board of his homeowners' association. Dr. Zebrack enjoys spending time  time withife and three children. He stays active through tap dancing, golfing and traveling.

Dr. Zebrack is currently accepting new patients.

Board-Certified: Family Practice

Residency: San Bernadino Medical Center
DO: College of Osteopathic Medicine of the Pacific
BS: University of California, Los Angeles
Member: AMA, American Academy of Family Physicians, California Academy of Family Physicians

Born in the small rural ski resort town of Show Low, Arizona, Cristal Sumerlin is a dedicated Physician Assistant specializing in Internal Medicine. With a strong passion for patient care and a desire to play an active role in their treatment and well-being, she chose the professional career path of a Physician Assistant after working as an X-Ray Technician. Cristal fell in love with medicine and recognized the need to further her education to better serve her patients and the community.

Cristal takes great pride in both her personal and professional accomplishments. As a mother and military spouse, she has successfully balanced the demands of family life while pursuing her professional goals. Her commitment to her patients and dedication to her work make her a source of pride and inspiration.

In the field of Internal Medicine, Cristal's strengths lie in managing complex disease processes such as diabetes. Her previous experience as an orthopedic technician and x-ray tech in an orthopedic practice has also honed her skills in orthopedics. She finds fulfillment in working with patients facing orthopedic conditions and providing comprehensive care.

Beyond her career, Cristal enjoys spending time outdoors and engaging in activities such as camping, hiking, and traveling. She cherishes these moments with her friends and family, as they provide a source of rejuvenation and happiness outside of her job.

With her unwavering dedication, clinical expertise, and compassionate approach, Cristal Sumerlin is an invaluable asset to Dr. Richard Lam's office. She strives to make a positive impact on her patients' lives and is committed to providing comprehensive and personalized care to improve their overall well-being.

Hong Sun, RN, MSN, FNP, is an experienced family nurse practitioner at Apple Urgent Care with locations in Colton, Coachella, Moreno Valley, Hemet, Perris, Riverside, Indio, and San Bernardino, California. She has over 30 years of nursing experience in the United States and China.

Hong earned her Bachelor of Science in Nursing from Beijing University in Beijing, China. After moving to the U.S., Hong received a forensic nursing certification from the University of California Riverside-Extension Center in Riverside, California, served as a registered nurse supervisor at Plymouth Tower Care and Living Center in Riverside, California, and continued her work as a registered nurse case manager at Lorian Health in Murrieta, California. 

After earning a Master of Science in Nursing at Azusa Pacific University in Azusa, California, Hong certified as a family nurse practitioner and held the position of nurse practitioner provider at Peak Health Solutions in Franklin, Tennessee, before joining the team at Apple Urgent Care.

Hong is experienced in surgical intensive care; emergency medicine; obstetrics and gynecology; ear, nose, and throat; ophthalmology; and home health care. Hong’s medical specialty of interest is the rewarding field of geriatrics, allowing her to improve the quality of life for patients and serve a critical need for aging populations.

Yessenia Toscano, FNP-C, MSN, BSN, RN, is a dedicated nurse professional at Apple Urgent Care in Colton, Coachella, Moreno Valley, Hemet, Perris, Riverside, Indio, and San Bernardino, California. 

Yessenia started her nursing education at Riverside City College in Riverside, California, earning an associate degree in nursing. While working as a clinical nurse at Riverside Community Hospital, Yessenia completed her Bachelor of Science in Nursing at California State University Fullerton in Fullerton, California. 

Dedicated to advancing in her profession, Yessenia continued her education at Azusa Pacific University in Azusa, California, earning her Master of Science to become a family nurse practitioner. During her master’s program, Yessenia won the Outstanding Masters Nursing Student award. 

Yessenia has several years of experience working as an acute care nurse and excels at delivering high-quality patient care as a nurse practitioner. She has experience in primary care, women’s health, pediatrics, psychosocial, and urgent care.

Urgent care, acute intensive care, and neurology are her favorite areas of medicine.

Yessenia is fluent in English and Spanish.

Outside of work, Yessenia enjoys gardening and spending time with her beautiful family.