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ConciergeInternal Medicine

Quintessential Care

Quick Facts

Practice TypeConcierge
DoctorsDavid Buyer MD, MBA, FACP, Internal Medicine, Marina Kovačević MD, FACP, Internal Medicine
Year Founded2011
HousecallsYes

About

At Quintessential Care, Dr. David R. Buyer and Dr. Marina Kovačević deliver internal medicine and primary care to adult patients in Chicago. Both physicians hold Fellow status in the American College of Physicians. The practice pairs preventive medicine with thorough chronic disease management. Patients receive direct access to their physician around the clock, including a personal cell phone number for urgent concerns outside office hours. Annual appointments run 60 minutes. The practice offers same-day or next-business-day visits with little or no waiting time. House calls are available on a case-by-case basis, and the practice extends long-distance care for patients who travel or relocate. A free introductory consultation with a registered dietitian rounds out the clinical offering. Quintessential Care maintains affiliations with Rush University Medical Center, Endeavor Health, and Advocate Lutheran General Hospital.

Details

Membership Details

Adult dependent children of members (ages 17-26) are included without additional membership fee. Children older than age 26 are eligible for a discounted membership.

Typical Appointment

60 minutes

House Calls Same-Day Appointments

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Frequently Asked Questions

Prospective patients can contact Quintessential Care directly to inquire about membership availability. The practice serves adult patients in the Chicago area. Membership includes a full range of primary care and preventive services.

Annual appointments run 60 minutes. The practice keeps its schedule designed for little or no waiting time.

Yes. Members at Quintessential Care receive their physician's personal cell phone number. This allows direct access for urgent concerns that arise outside regular office hours. Both Dr. Buyer and Dr. Kovačević are available 24/7.

Yes. The practice offers same-day or next-business-day appointments for members. Keeping the panel focused allows the practice to accommodate urgent needs quickly.

Yes. Quintessential Care offers house calls on a case-by-case basis. Patients with mobility limitations or urgent needs at home can discuss this option directly with their physician.

Adult dependent children of members between the ages of 17 and 26 join without an additional membership fee. Children older than 26 qualify for a discounted membership rate.

Yes. The practice provides long-distance care for patients who travel frequently or spend time away from Chicago. Patients can also communicate with their physician securely through the FollowMyHealth patient portal.

Yes. Quintessential Care offers a complimentary introductory consultation with a registered dietitian. This benefit supports members working on nutrition-related health goals.

Yes. The practice extends care to visiting relatives and friends of members on a case-by-case basis. This is part of the practice's commitment to accessible, relationship-based care.

Quintessential Care maintains affiliations with Rush University Medical Center, Endeavor Health, and Advocate Lutheran General Hospital. These affiliations support continuity of care when members need specialist referrals or hospital-level services.

Practice last updated June 11, 2026