Meet the Doctors

Medical Team at Fifth Ave Primary Care Physicians, S.C. in St. Charles IL 

Skill and compassion go hand in hand when providing exceptional patient care. As your health care professionals, we stay up to date on the latest advancements in medicine in order to provide the most current treatment options to our patients. As your doctors, we recognize that our patients are unique individuals who have placed a great deal of trust in us and our team. That is just one reason why we value each and every patient relationship.

We appreciate the time you’ve taken to visit our website and find out more about our medical practice, our team, and the many medical  services we can provide to help you maintain optimum health. Click on the links below to learn about the members of our skilled medical team. 

Our Doctors

Catherine Thomas, MD

Ronald Vilbar, M.D.

Our Physician Assistants

Steve Thiel, MPAS, PA-C

Amy Frazer, MPH, PA-C

Dinara Hyland, NP

Two Convenient Office Locations 

St. Charles Office
2570 Foxfield Rd, Suite 100
St. Charles, IL 60174
Phone: (630) 584-1950
Fax: (630) 584-8994


South Elgin Office
472 Briargate Drive
South Elgin, IL 60177
Phone: (630) 584-1950