Melissa Sum, MD, FACE

Dr. Melissa Sum is a board-certified internist and endocrinologist, and a Fellow of the American Association of Clinical Endocrinology (FACE). She specializes in the management of longitudinal medical care as well as preventative and metabolic health. Based in New York City, she is known for her compassionate, evidence-based approach and dedication to improving long-term health outcomes and the well-being of her patients.

At the heart of Dr. Sum’s practice is a strong belief in partnership. She’s passionate about improving health and daily well-being by building meaningful relationships with her patients, grounded in trust, listening, and open dialogue. She takes time to understand each person’s goals and lifestyle, including nutrition, exercise, and values. She works collaboratively to create personalized care plans rooted in the latest science. She treats every patient with the same compassion she would offer a family member, creating a supportive environment where patients feel truly seen and heard—and empowered to take an active role in their long-term wellness.

Dr. Sum completed her undergraduate degree at Columbia College, graduating summa cum laude, Phi Beta Kappa with honors in chemistry. She earned her medical degree from Columbia University. She trained in internal medicine at Barnes-Jewish Hospital/Washington University, where she served an additional year as Medical Chief Resident. She returned to Columbia for a prestigious NIH Fellowship in Endocrinology, where she was selected as a Women's Health Scholar and worked at the Center for Menopause, Hormonal Disorders, and Women's Health. She then joined NYU and rose to the rank of Associate Professor. She served as Medical Director of the Diabetes and Endocrine Associates practice and Content Director of the endocrinology module for the first-year medical students at NYU Grossman School of Medicine.

In addition to her clinical work, Dr. Sum is a recognized leader in medical education. She has received multiple teaching honors, including NYU’s Rising Educator, Pre-Clerkship Educator of the Year, and Faculty Teacher of the Year awards. She remains actively involved in mentoring future physicians and finds particular joy in breaking down complex physiology pathways—a teaching approach that also enhances her ability to explain medical concepts clearly and compassionately to her patients. Whether managing complex internal medicine or endocrine disorders or guiding patients through preventive strategies, Dr. Sum is a trusted partner in health. She is respected for her clinical expertise, collaborative spirit, and unwavering dedication to patient-centered care.

Outside the office, Dr. Sum enjoys spending quality time with family and friends and reading a great book when time permits.