Dr. Hillegass graduated from Perelman School of Medicine at the University of Pennsylvania in 1964 and has been in practice for 54 years. Dr. Hillegass also specializes in Orthopedic Surgery. He currently practices at Christopher S Ottiano MD and is affiliated with Landmark Medical Center, Memorial Hospital of Rhode Island and Newport Hospital. Dr. Hillegass accepts multiple insurance plans including Aetna and Cigna. Dr. Hillegass is board certified in Orthopaedic Surgery. Dr. Hillegass also practices at Brain & Spine Neurosurgical Institute in Smithfield, RI.