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Concierge
Internal Medicine

Lutanen Health

Quick Facts

Practice TypeConcierge
LocationBoston, Back Bay, Cambridge, Brookline, Nantucket, Newton, Wellesley, Lexington, Weston, Concord, Needham, Andover, New York, Manhattan, Miami, Palm Beach
DoctorsJulia Loewenthal MD, Internal Medicine, Jay Luthar MD, DipABLM, Internal Medicine
Panel Size150 patients per doctor
Telehealth TypePhone, email, and secure portal
HousecallsYes
Telehealth AvailableYes

About

At Lutanen Health, two Harvard Medical School faculty physicians deliver concierge internal medicine, geriatrics, and longevity care from Boston's Back Bay. Dr. Jay Luthar founded the practice alongside Co-Founder and Director of Operations Sara Rantanen. Dr. Julia Loewenthal joined as internist, geriatrician, and Director of the Housecall Program. Both physicians earned recognition as 2026 Castle Connolly Top Doctors for the second consecutive year.

Each physician caps their panel at 150 patients. The practice organizes its approach around four pillars: precision, presence, proactivity, and partnership. Members receive a two-hour annual wellness visit, same-day access, and 24/7 direct physician contact. The diagnostic suite includes epigenetic clock testing, AI-guided cardiovascular imaging, liquid biopsy, VO2 max testing, DEXA scanning, and microbiome analysis. An Executive Health program serves high performers and leadership teams. The Housecall Program extends care to older adults and patients with mobility limitations. Both physicians hold staff appointments at Brigham and Women's Hospital, connecting members to the Mass General Brigham network.

Details

Address

607 Boylston St., Suite 301, Boston, MA 02116

Membership Details

An Annual Membership fee allows for a small ratio of patients per doctor. All medical services are billed to insurance.

Typical Appointment

120 minutes

Telemedicine
House Calls
Same-Day Appointments
Max 150 patients per doctor

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Frequently Asked Questions

Members pay an Annual Membership fee that covers access to the practice and its full range of services. Medical services bill separately to your insurance. The membership keeps physician panels small, at no more than 150 patients per doctor, supporting thorough visits and consistent access to your physician.

Lutanen Health bills all medical services to insurance. The Annual Membership fee covers practice access and is separate from insurance billing. Patients should confirm their specific plan details when they join.

The annual wellness visit runs two hours. This format gives your physician the time to review your health in depth, discuss your goals, and build a personalized care plan. Same-day and next-day appointments are also available for acute needs.

Yes. Members have 24/7 direct access to their physician by phone, email, and secure portal. After-hours direct physician contact is a standard part of membership, not an exception.

Yes. Lutanen Health offers telemedicine visits for members. Telehealth works well for follow-up care, urgent questions, and ongoing chronic disease management when an in-person visit is not necessary.

Yes. The Lutanen Housecall Program serves older adults and patients with mobility limitations. Dr. Julia Loewenthal directs the program, providing comprehensive geriatric assessments, medication reviews, post-hospital follow-up, and care coordination in patients' homes.

The practice runs a broad diagnostics suite, including epigenetic clock testing, biomarker panels, genetic risk screening, AI-guided cardiovascular imaging, liquid biopsy, continuous glucose monitoring, VO2 max testing, DEXA body composition scanning, microbiome analysis, and clinical-grade sleep analysis. These tools support early detection and proactive health planning.

Yes. Lutanen Health runs a dedicated Executive Health program for high performers, companies, and leadership teams. The program pairs advanced diagnostics with personalized health strategy, preventive planning, and direct physician access.

Each physician at Lutanen Health caps their panel at 150 patients. That limit supports same-day availability, longer appointments, and a care relationship that deepens over time.

Lutanen Health accepts a limited number of new members. Prospective patients can submit a membership inquiry through the practice website or contact the office directly at 617-676-2592. The practice is located at 607 Boylston St., Suite 301 in Boston's Back Bay, with complimentary valet parking and easy access from MBTA Copley Station.

Practice last updated March 21, 2026