His areas of expertise include breast biopsy, colorectal surgery procedures, and thyroid problems. He is professionally affiliated with Northwestern Medicine Central DuPage Hospital, Adventist Medical Center Hinsdale, and DuPage Medical Group (DMG). Dr. Dehaan is in-network for Aetna EPO, Blue Cross/Blue Shield, Coventry, and more. Dr. Dehaan's practice is open to new patients. Before performing his residency at Rush University Medical Center, Dr. Dehaan attended the University of Michigan Medical School. He has received professional recognition including the following: Chicago Super Doctors.