About CalOptima

Mary Giammona, M.D., MPH

Pediatrician and Physician Executive

Mary Giammona

Mary Giammona, M.D., MPH is the pediatric and California Children’s Services (CCS) medical director for Molina Healthcare of California. A board-certified pediatrician and fellow of the American Academy of Pediatrics, Dr. Giammona is a member of the Orange County Medical Association, California Medical Association and the American Medical Association. In her current position, she oversees Molina’s pediatric case review and case management programs. She also directs Molina’s efforts to serve the vulnerable children in CCS by leading multidisciplinary team meetings addressing their needs, especially as they age out of CCS. Before joining Molina, Dr. Giammona held various medical leadership roles, including regional medical director for Anthem Medi-Cal and chief of managed care for the Los Angeles County Department of Health Services. She also served as the chief medical officer of Health Plan of San Mateo, a county organized health system similar to CalOptima. She earned her bachelor’s degree from UC San Diego, medical degree from UC San Francisco and master’s in public health from UC Berkeley. Dr. Giammona was appointed a CalOptima director in August 2020.

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