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About our Medical Center

Pain Medicine Associates is staffed by certified and caring Physicians, Physician Assistants, Nurse Practioners specially trained in pain management. Patients are seen at our centers for treatment and advanced medicine.

Because persistent pain is most likely a symptom of an underlying disease, patient must be thoroughly evaluated by their own physicians, who then refer them to our offices.

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Our medical provider:

Dr. Medhat Mikhael

Dr. Medhat Mikhael

Dr. Mikhael our medical director is double board certified in both Anesthesiology and Pain Medicine. Dr. Mikhael is fellowship trained in Pain Medicine and is the director of the Pain Medicine Division, Department of Anesthesiology Hoag Memorial Presbyterian Hospital and cancer center. Dr. Mikhael has a Surgical background with a Master degree in general and trauma surgery which adds to his experience in surgical interventions for treatment of chronic pain. Dr. Mikhael has a special interest in some of the complicated aspects of chronic pain including neuropathic and cancer pain and he is an active member on the cancer committee of of Hoag Memorial Hospital Presbyterian and both Long Beach Memorial and Orange Coast Memorial Hospitals.

Dr. William Barreto

Dr. William Barreto

Dr. Barreto is a board certified Physical Medicine and Rehabilitation (PM&R) physician and is board certified in Pain Management. He attended medical school at Loma Linda University, in southern California. Drawn by their focus on whole person care and an exceptional learning environment, Dr. Barreto remained at Loma Linda for Residency in PM&R and for Fellowship training in Pain Management. After completing Residency, Dr. Barreto accepted an academic position at the Loma Linda VA Hospital, affording him the opportunity to teach PM&R Residents and Pain Fellows the intricacies of treating painful musculoskeletal conditions. Dr. Barreto holds a Bachelors degree in Psychology which continues to be a valuable asset when assisting people with the many psychological challenges which accompany chronic pain. Having previously been the medical director of a peer review company which focused on Workers Compensation claims, Dr. Barreto is proficient at navigating the challenges presented by that system. In his free time, Dr. Barreto enjoys competing in Triathlons, rockclimbing, wakesurfing, and traveling.

Dr. Andrew Messiha

Dr. Andrew Messiha

Dr. Messiha is a pain medicine specialist and anesthesiologist. He has an interest and background in multimodal pain management, utilizing interventional, medical, physical, and psychological therapies to treat the person as a whole. He is a graduate of the Pennsylvania State University College of Medicine, and completed his general surgery internship at Harbor-UCLA Medical Center. After completing his anesthesiology residency at Case Western Reserve University/Metrohealth Medical Center in Cleveland, Ohio, Dr. Messiha completed a pain medicine fellowship at the University of Pittsburgh Medical Center. Dr. Messiha and his family are happy to be back home in Southern California, and he looks forward to building long-term relationships with his patients and providing the highest level of care to improve their quality of life.

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