About
Gilberto Sustache, Jr., MD earned his Bachelor of Arts in Biology from Brown University in 1996. He went on to complete his medical degree at the University of Massachusetts Medical School in 2001. He then trained at Memorial Hermann Southwest Hospital in Houston, Texas, completing both his internship and his Family Medicine residency by 2004. He holds board certification from the American Board of Family Medicine and maintains licensure in both Massachusetts and Texas.
Over more than 20 years in primary care, Dr. Sustache has built a practice centered on listening carefully and treating the whole patient. He speaks both English and Spanish fluently. He takes a whole-body approach to care, addressing physical health alongside lifestyle, stress, and overall well-being. Outside the office, he stays active through running and fitness, enjoys car detailing, and spends time with his wife of over 27 years and their three children. Patients consistently describe him as thorough, compassionate, and personally reachable when it matters most.
Education & Training
Undergraduate
Brown University, Providence, RI — Bachelor of Arts, Biology, 1996
Medical School
University of Massachusetts Medical School, Worcester, MA — Doctorate of Medicine, 2001
Residency
Memorial Hermann Southwest Hospital, Houston, TX — Family Medicine, 2002-2004
Additional Training
Internship: Memorial Hermann Southwest Hospital, Houston, TX, 2001-2002
Certifications
Languages
English, Spanish
Conditions Treated
Who is Dr. Sustache right for?
Dr. Sustache is a strong fit for adults seeking a long-term relationship with a single, consistent physician. Patients managing chronic conditions like type 2 diabetes, hypertension, or high cholesterol benefit from his focused, ongoing approach. Spanish-speaking patients appreciate his fluency and the ease it brings to their care. Those who travel frequently value his ability to coordinate care across locations. Anyone who wants direct physician access around the clock will find his model a natural match.
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Frequently Asked Questions
Dr. Sustache treats a broad range of primary care conditions. He has particular focus on chronic disease management, including type 2 diabetes, hypertension, and high cholesterol. He also addresses preventive health, wellness planning, and travel-related medical needs.
Yes, Dr. Sustache holds board certification from the American Board of Family Medicine. He maintains licensure in both Massachusetts and Texas.
Dr. Sustache earned his medical degree from the University of Massachusetts Medical School in 2001. He completed his internship and Family Medicine residency at Memorial Hermann Southwest Hospital in Houston, Texas, finishing in 2004. Before medical school, he studied Biology at Brown University.
Yes, Dr. Sustache personally sees every patient at every visit. The practice does not use nurse practitioners or physician assistants. Patients always have direct access to their physician.
Yes, Dr. Sustache speaks both English and Spanish fluently. Spanish-speaking patients can communicate with him comfortably throughout their care.
Dr. Sustache takes a whole-body approach to medicine. He addresses physical health alongside lifestyle, stress, and overall well-being. He focuses on listening carefully and building individualized care plans for each patient.
Yes, Dr. Sustache remains reachable by phone 24 hours a day, including evenings and weekends. Members can contact him directly when urgent concerns arise outside of regular office hours.
Dr. Sustache brings over 20 years of primary care experience to his practice. He has spent his career building a family medicine practice centered on thorough, relationship-driven care in the Marlborough, MA area.
Doctor profile last updated March 21, 2026