Our Providers

Mona Shah, M.D.

Board Certified Internal Medicine

Prior to moving to Southern California and opening a private practice specializing in disease and prevention, Dr. Shah served as Medical Director at Evergreen Valley Community College, Student Health Clinic, in San Jose, California.


Mirko Andrew Giaconi, M.D.

Board Certified Internal Medicine

Dr. Giaconi was a primary care physician and a cardiologist since 1976 before joining Prime Medical in 2017.


Carolyn Vargas, M.D.

Board Certified Internal Medicine
Dr. Carolyn Vargas

Dr. Vargas is a board certified internist with 26 years of experience and a strong background in cardiology. She is skilled at treating acute and chronic conditions for seniors with a strong focus on education and lifestyle modification.


Robert Thayer D.O., MBA

Robert Thayer D.O.
Dr. Thayer is a board certified internist and served in the United States Air Force as an electronic warfare systems technician. He has also earned a Doctor of Osteopathic Medicine and an MBA. Dr. Thayer enjoys hiking and surfing with his family in his spare time.


Paul Sliskovich M.D.


Dr. Paul Sliskovich is a board certified family medicine physician. He earned his undergraduate degree from the University of Southern California and his doctor of medicine from Creighton University in Omaha Nebraska


Neda Khadem, O.D.


Dr. Khadem is a graduate of University of California Irvine and then went on to University of Southern California where she earned a Doctor of Optometry. Dr. Khadem provides diagnosis, treatment and manages diseases, injuries and disorders of the visual system.


Lilia Prado, D.O.

Dr. Prado
Dr. Prado is a board certified Family Medicine Physician. She has been providing care for teenagers, adults and geriatric patients for over 30 years.  Dr. Prado is fluent in both English and Spanish.


Jillian Gray, D.O.


Dr. Jillian Gray, DO is an internal medicine specialist with over 20 years of experience in the medical field. Prior to joining Prime Medical, Dr. Gray ran her own practice in Huntington Beach.


Megan Duffy PA-C


Megan earned her Masters of Science in Physician Assistant Studies as well as her Masters of Public Health from Touro University California. She trained in many areas of general medicine including orthopedic surgery, internal medicine, emergency medicine & women’s health.