photo provided by Graybill Medical Group

Providing San Marcos Residents With Top Notch Family and Sports Medicine

Graybill Medical Group, North County’s largest independent multi-specialty medical group, is likely located just around the corner from where you live or work. The group has offices throughout the region, with more than 80 physicians and practitioners providing primary and specialty care to all members of the family.

Dr. Martin Graybill, a family physician in Escondido, founded the group back in 1932. “At the time, Escondido was a small town of 3,500 people,” recalls family doctor Isela Penunuri, lead physician at at Graybill’s San Marcos office. “The original practice was located on the second floor of what was then Escondido Hospital. Today, we serve over a dozen communities along the 78 Corridor plus Escondido, Sabre Springs, Ramona, Fallbrook, and Temecula.”

Despite its size, Graybill has managed to retain its friendly, small-town culture. “Many of the families we treat have been with us for multiple generations,” says Dr. Penunuri. “Some of our doctors have patients who actually were delivered by Dr. Graybill.”

Its strong commitment to service is perhaps the reason why Graybill, as the largest member of the Sharp Community Medical Group, was recently named San Diego’s Best Medical Group and received the CAPG Standards of Excellence award and Integrated Healthcare Association (IHA) award for Excellence in Healthcare. “To earn the IHA Award, a physician organization must rank in the top 50 percent for clinical quality, patient experience, and cost performance,” elaborated Dr. Penunuri. “Winners have to demonstrate strong quality and patient satisfaction while effectively managing costs.”
The Graybill San Marcos medical team includes:

Isela Penunuri, M.D. Dr. Penunuri earned her medical degree from Autonomous University of Guadalajara Medical School and served her Family Medicine residency at the University of Wisconsin, Eau Claire, where she was chief resident. She also speaks Spanish.

Oksana Hirniak, D.O., a board-certified osteopathic family physician. Dr. Hirniak earned her medical degree from Philadelphia College of Osteopathic Medicine and served her residency at the Naval Hospital in Camp Pendleton. She also speaks Russian and Ukrainian.

Cheng (Oliver) Lee, M.D., a board certified family physician. Dr. Lee served his residency at Adventist Medical Center. He also speaks Mandarin Chinese.

Alexander Espinoza, M.D., board certified in both family and sports medicine. Dr. Espinoza attended UCLA Medical School and served his residency at Kaiser Permanente LAMC. He also speaks Spanish.

Michele Buxton, PA-C, a certified Physician Assistant specializing in family medicine. She attended Western University of Health Sciences in Pomona.

Graybill San Marcos is open Monday through Friday between 8 a.m. and 5 p.m. To make an appointment, call 866-228-2236.


mp_graybill_logoName of Business: Graybill Medical Group – San Marcos Office
Lead Physician: Isela Penunuri, M.D.
Nurse Manager: Nadine Parks, L.V.N.
Address: 277 Rancheros Dr., Suite 100,
San Marcos, CA 92069
Website: www.Graybill.org
Email: jdavison@graybill.org
Phone: 866-228-2236
Services: Family Medicine, Sports Medicine
Description of Business: Gaybill Medical Group is North County’s largest independent multi-specialty medical group. Our San Marcos Office provides family and sports medicine services to people of all ages who live and work in the San Marcos area.