His areas of expertise include the following: diabetes, hypertension (high blood pressure), and influenza (flu). Patient reviews placed him at an average of 2.0 stars out of 5. Dr. Witmer takes United Healthcare Platinum, United Healthcare Navigate, and United Healthcare POS, in addition to other insurance carriers. Dr. Witmer is a graduate of the University of Rochester School of Medicine and Dentistry and a graduate of Jefferson University Hospitals' residency program. He is professionally affiliated with Thomas Jefferson University Hospital. He is closed to new patients at this time.