Dr. Ronald G. Lehman, MD is a Chula Vista pediatrician who earned his medical degree from Ohio State University College of Medicine in 1968 and practices on Third Avenue at the Children's Primary Care Medical Group Centre Medical Plaza. He sees patients at the 865 Third Avenue office, part of CPCMG's 28-location pediatric network that also operates from Children's Primary Care Medical Group Medical Center Court nearby on Medical Center Drive. CPCMG is the San Diego region's only health network focused exclusively on children from birth through age 18, offering same-day appointments, newborn care, immunizations, and developmental screenings at the Third Avenue and L Street intersection. Pediatric behavioral concerns identified during well-child visits connect families to mental health resources in the same corridor, including LifeStance Therapists & Psychiatrists Chula Vista. Complex pediatric panels include asthma action-plan development with peak-flow monitoring, multi-vaccine catch-up schedules for internationally adopted children, and pre-participation sports physicals incorporating cardiac auscultation and musculoskeletal screening per AAP Preparticipation Physical Evaluation guidelines.