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Concierge
Internal Medicine

Thrive Internal Medicine

Quick Facts

Practice TypeConcierge
LocationChicago, Northbrook, Glencoe, Glenview, Highland Park, Wilmette, Kenilworth, Skokie, Evanston, Lake Forest, Chicago's North Shore
DoctorsSara Berg MD FACP, Internal Medicine, Caroline Kalember MD, Internal Medicine, Kate Petrungaro MD, FACP, Internal Medicine + 1 more
Telehealth TypeVirtual visits via secure HIPAA-compliant platform (Spruce); secure messaging via Spruce
Telehealth AvailableYes

About

At Thrive Internal Medicine, four board-certified physicians deliver concierge internal medicine care to adults across Chicago and the North Shore. The practice operates from Northbrook, IL, serving patients from Evanston, Highland Park, Wilmette, Glenview, and surrounding communities. Each physician limits their panel, ensuring thorough visits and same-day or next-day appointment availability.

Dr. Sara Berg, Dr. Kate Petrungaro, Dr. Caroline Kalember, and Dr. Mariamou Sims each trained at or with Northwestern Medicine. The practice holds affiliations with Northwestern Memorial Hospital, Northwestern Medicine Lake Forest Hospital, and Northwestern University. Through Epic's CARE EVERYWHERE portal, patient records connect seamlessly across major Chicago-area health systems. Thrive offers a full scope of primary care, including chronic condition management, women's health, in-office point-of-care testing, body composition analysis with the InBody 970, ECGs, and after-hours emergency phone access. Every physician on staff holds board certification, and the practice does not use nurse practitioners or physician assistants.

Details

Address

400 Skokie Boulevard, Suite 405, Northbrook, IL 60062

Membership Details

Annual membership fee plus a one-time registration fee upon initiation (not repeated annually). No additional copays, charges, or hidden fees. Annual fee covers all office visits, virtual care, and all other communication with your doctor. Lab work, vaccines, diagnostic testing not done in-office, specialist visits, ER visits, and hospitalizations are billed to insurance separately.

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Frequently Asked Questions

Thrive charges an annual membership fee that covers all medical services the practice provides. At the start of your membership, you also pay a one-time registration fee, which does not repeat in subsequent years. After that, no copays or additional charges apply to office visits, virtual visits, sick visits, or any other communication with your doctor. Lab work, vaccines, specialist visits, and hospitalizations bill separately to your insurance.

Your membership covers unlimited in-person office visits, virtual visits, sick visits, follow-up visits, and chronic condition management. It also includes your annual comprehensive physical, women's health care such as breast exams and pap smears, point-of-care testing with rapid results, ECGs, nebulizer treatments, body composition analysis on the InBody 970, coordination of care with specialists, and after-hours emergency phone access. The practice provides all care exclusively through its physicians, with no nurse practitioners or physician assistants involved.

Thrive does not accept insurance for the services its physicians provide directly. Your annual membership fee covers all practice-based care. The practice does bill insurance separately for lab work, vaccines, diagnostic testing, specialist visits, ER visits, and hospitalizations, so carrying insurance remains important for those services.

Yes. Thrive typically offers same-day or next-day appointments. Each physician keeps a limited panel, which makes this kind of timely access possible. Patients can request appointments through Spruce, the practice's secure HIPAA-compliant messaging platform.

Yes. Thrive offers virtual visits through Spruce, a secure HIPAA-compliant platform. Patients use the same app for secure messaging, appointment requests, and clinical questions between visits. Your physician determines when a virtual visit is appropriate for your specific concern.

Thrive accepts patients aged 18 and older. The practice welcomes adults regardless of prior conditions or medical history, so you do not need to meet any health criteria to join.

Yes. All four physicians at Thrive hold board certification in Internal Medicine. The practice does not employ nurse practitioners or physician assistants. Every patient receives care directly from a board-certified physician.

When your Thrive physician refers you to a specialist, that specialist bills you or your insurance separately. The practice actively coordinates care with specialists and communicates directly with hospital teams when needed. Through Epic's CARE EVERYWHERE portal, your records connect to Northwestern Memorial Hospital, Northwestern Medicine Lake Forest Hospital, NorthShore University Health System, Rush, Loyola, Advocate/Lutheran General, and other major health systems.

Thrive does not make house calls. The practice sees patients at its Northbrook office at 400 Skokie Boulevard, Suite 405, and offers virtual visits through Spruce for situations where in-person care is not required. Free parking, including dedicated spaces near the entrance, is available at the office.

Thrive uses Spruce as its primary communication platform. Through Spruce, you can send secure messages to your physician and medical assistants, request appointments, and conduct virtual visits. For access to clinical notes and test results, the practice uses MyChart through Northwestern Medicine's Epic system.

Practice last updated March 21, 2026