Zack Treat, MD

"Having grown up in the small town of Festus, Missouri, providing care in a rural community has always been my goal.

I chose family medicine for two main reasons. First, I believe that a core problem with our current healthcare system is the limited access to primary care. 

Second, family medicine allows me to see patients of all ages who have a wide variety of health care needs. Every day is different.

When not working, my wife, Sara, and I enjoy being outdoors and exploring trails with our dogs. We look forward to making Mexico our home."

"Cornerstone is a DPC clinic, meaning we are a membership-based clinic that does not accept insurance. This liberates you from the cumbersome and expensive restraints required by insurance companies. We work with and for you, not the insurance company, with prices that are fair and easy to understand. No more surprises when you checkout. When we prescribe a medication, we fill it for you — at cost. No hidden fees at the pharmacy. Our services easily pair with a health-savings account (HSA) or high-deductible catastrophic insurance plan to pay for emergencies, surgeries and hospitalizations. With a lower premium, substantially cheaper medications, and a flat monthly fee without copays, we provide more affordable medical coverage with increased accessibility and excellent, personalized care for you and your family. Want specifics on charges? We actually tell you our costs, nothing hidden."