Dr. Illig graduated from Georgetown University School of Medicine in 1983 and has been in practice for 35 years. He completed a residency at Mayo Clinic and Medical School. He currently practices at Colorado Springs Neurological Associates PC and is affiliated with Penrose Hospital. Dr. Illig accepts multiple insurance plans including Aetna, Rocky Mountain Health Plans and Medicare. Dr. Illig also practices at Mountain States Pathologists in Colorado Springs, CO.