About
Dr. Marcus Mayus has practiced medicine in the Greenwich community for more than 15 years. He leads Greenwich Medical Concierge as its sole physician, providing primary care with direct, around-the-clock access to every member. Members reach him by cell phone or personal email at any hour, any day of the year.
Dr. Mayus holds affiliations with both Greenwich Hospital and Stamford Hospital, giving members continuity of care across office visits, sick visits, physicals, and hospital care. His clinical scope covers advanced cancer screening, cardiac and pulmonary diagnostics, anti-aging medicine, hormone therapies, weight loss management, and COVID-19 testing and treatment. He has earned several physician recognitions, including the Top 10 Doctor State award, the Patients' Choice Award, the On-Time Doctor Award, and the Compassionate Doctor Recognition. He conducts same-day visits, house calls, and early or late appointments to fit his members' schedules.
Conditions Treated
Who is Dr. Mayus right for?
Dr. Mayus is a strong fit for adults seeking a primary care physician with broad diagnostic capabilities and direct access. Patients managing chronic conditions, cardiovascular risk, or hormonal health benefit from his comprehensive clinical scope. Those who want proactive cancer screening, including full body MRI and multi-cancer blood testing, will find his practice well equipped. Executives and busy professionals appreciate his early, late, and same-day appointments. Members across Greenwich, Westchester County, and Fairfield County rely on him for both routine care and hospital-level continuity.
Similar Doctors Nearby
Dr. Michael CanterMD
acute illness, chronic illness, elder care conditions +2 more
Dr. Herbert ArcherM.D. PH.D,
Internal medicine conditions, Primary care concerns
Dr. Catherine JoyceM.D.
Internal medicine conditions, Primary care conditions, Chronic disease management +1 more
Frequently Asked Questions
Dr. Mayus specializes in primary care with a broad clinical scope. His work includes advanced cancer screening, cardiac and pulmonary diagnostics, anti-aging medicine, hormone therapies, and weight loss management. He also provides COVID-19 testing and treatment and pharmacogenomic screening.
Members reach Dr. Mayus directly by cell phone or personal email at any hour, every day of the year. This direct access is a core feature of membership at Greenwich Medical Concierge.
Dr. Mayus uses several advanced screening tools, including the Ezra Whole Body MRI, the Galleri multi-cancer early detection blood test, and genetic hereditary cancer testing. The genetic panel covers 48 genes across 11 cancer types. He also screens for pancreatic, colon, prostate, testicular, and blood cancers.
Yes. Dr. Mayus holds affiliations with both Greenwich Hospital and Stamford Hospital. These affiliations give members continuity of care that extends from routine office visits through hospital stays.
Dr. Mayus offers bio-identical hormone replacement therapy, testosterone replacement therapy, and post-menopausal symptom management. He tailors hormone treatment plans to each patient's clinical needs.
Yes. Dr. Mayus provides weight loss management that includes medications such as Ozempic, Wegovy, and Mounjaro. He works with members to develop individualized plans based on their health profile.
Dr. Mayus has earned several physician recognitions, including the Top 10 Doctor State award, the Patients' Choice Award, the On-Time Doctor Award, and the Compassionate Doctor Recognition. These reflect his track record of patient-centered, timely care.
Yes. Dr. Mayus conducts house calls for members who need care at home. He also offers same-day visits and early or late appointments to accommodate busy schedules.
Yes. When members need specialist care, Dr. Mayus works to secure appointments within a day, and sometimes within minutes. His long-standing relationships in the region support fast specialist access.
Doctor profile last updated March 21, 2026