Leadership
At Arcturus Healthcare, our leadership team is committed to fostering a culture of clinical excellence, collaboration, and innovation, empowering our providers and staff to deliver exceptional patient-centered care every day.

Practice Leader - Troy Internal Medicine
Michael S. Lumberg
MD, MPH
Dr. Michael Lumberg is an internal medicine physician whose background combines clinical medicine with advanced training in public health and epidemiology. He earned a bachelor’s degree in psychology and a Master of Public Health in general epidemiology from the University of Michigan before receiving his medical degree from Wayne State University School of Medicine.
Dr. Lumberg completed his internship and internal medicine residency at William Beaumont Hospital in Royal Oak. He practices with Troy Internal Medicine, where his broad training supports a thoughtful, evidence-based approach to adult primary care and long-term health management.
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