Maricopa County Medical Society (MCMS), established in 1892 and incorporated in 1935, is a not-for-profit membership of physicians throughout Maricopa County. Maricopa County Medical Society membership includes Allopathic (MD) and Osteopathic (DO) physicians, resident & fellow physicians, and medical students. The Mission of MCMS is to promote excellence in the quality of care, health of the community, and to represent and serve its members by acting as a strong, collective physician voice.