He is rated highly by his patients. Areas of expertise for Dr. Donzelli include sinusitis (sinus infection), thyroid problems, and thyroid surgery. His professional affiliations include Northwestern Medicine Central DuPage Hospital, Delnor Hospital, and DuPage Medical Group (DMG). He honors several insurance carriers, including Aetna EPO, Blue Cross/Blue Shield, and Coventry. He welcomes new patients. Dr. Donzelli attended Rosalind Franklin University of Medicine and Science, Chicago Medical School and then went on to complete his residency at a hospital affiliated with Loyola University.