About
Dr. David R. Buyer trained at the University of Illinois for medical school and completed both his residency and Chief Residency at Rush University Medical Center. He also holds an MBA, bringing a management perspective to clinical practice. After training, he joined Economou and Associates, which later became West Loop University Medicine, Ltd. He co-managed that practice until 2011, when he opened what is now Quintessential Care.
At Rush, Dr. Buyer served as Medical Director of Physician Services and Primary Care. He sat on the Medical Staff Executive Committee and co-chaired the Chest Pain pathway committee. He also contributed to the Privacy and Compliance Panel for the Certification Commission on Healthcare Information Technology. A Fellow of the American College of Physicians, he is passionate about antibiotic stewardship, vaccines, travel medicine, and evidence-based health screening. He treats the whole patient, weighing both physical and psychological factors alongside each patient's own health beliefs and goals.
Education & Training
Medical School
University of Illinois
Residency
Rush University Medical Center
Additional Training
MBA
Certifications
Who is Dr. Buyer right for?
Dr. Buyer is a strong fit for adults who want a physician deeply invested in preventive medicine and long-term health. Patients managing chronic conditions benefit from his thorough, whole-patient approach. Those who value a physician with extensive clinical leadership experience will find his background reassuring. He works well with patients who want tailored guidance on health screenings, vaccinations, and evidence-based wellness planning.
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Internal MedicineFrequently Asked Questions
Dr. Buyer focuses on internal medicine, primary care, and preventive medicine. He manages chronic diseases, conducts annual physical exams, and oversees health screenings and vaccinations. He treats adults and takes a whole-patient approach that considers both physical and psychological health.
Dr. Buyer treats the whole patient, weighing physical and psychological factors alongside each person's health beliefs and goals. He tailors his recommendations to each patient's values, needs, and schedule. His approach centers on being a dedicated healthcare advocate.
Dr. Buyer attended medical school at the University of Illinois. He completed his residency and Chief Residency at Rush University Medical Center. He also holds an MBA.
Dr. Buyer holds Fellow status in the American College of Physicians, designated by the FACP credential. He is a member of the American Board of Internal Medicine.
Dr. Buyer served as Medical Director of Physician Services and Primary Care at Rush University. He sat on the Medical Staff Executive Committee and co-chaired the Chest Pain pathway committee. He also contributed to the Privacy and Compliance Panel for the Certification Commission on Healthcare Information Technology.
Dr. Buyer has practiced internal medicine since completing his residency at Rush University Medical Center. He co-managed West Loop University Medicine, Ltd. before opening his own practice in 2011, which is now Quintessential Care.
Yes. Quintessential Care offers second opinion chart reviews as a member benefit. Patients can bring outside records for Dr. Buyer to review and discuss.
Doctor profile last updated June 11, 2026