Dr. Nelligan graduated from Rush Medical College of Rush University Medical Center in 1982 and has been in practice for 36 years. He completed a residency at Stanford University School of Medicine. He currently practices at Airell L Nygaard MD and is affiliated with Adventist Health Sonora Regional Medical Center. Dr. Nelligan accepts multiple insurance plans including Aetna, Medicare and Humana. Dr. Nelligan also practices at Sierra Emergency Medical Group Inc in Sonora, CA.