About
Dr. Merrill Harris brings more than 20 years of internal medicine expertise to AIM Health. She holds board certification in Internal Medicine from the American Board of Internal Medicine and earned fellowship in the American College of Physicians. She completed her undergraduate degree in biology at Claremont McKenna College, then earned her medical degree from the University of Southern California Keck School of Medicine. Her residency in internal medicine took place at Legacy Emanuel and Good Samaritan Hospitals in Portland.
Before joining AIM Health, Dr. Harris spent 17 years at Providence Portland Medical Center as a hospitalist managing inpatient care. She supervised and instructed resident physicians during inpatient medicine rotations and served as a medical director in post-acute care, overseeing patients in skilled nursing facilities. Portland Monthly Magazine recognized her as a Top Doctor in Internal Medicine in 2013, 2019, 2020, 2024, and 2026. For nearly a decade, she served as supervising physician at the Portland Marathon Finish Line Medical Tent. She also volunteered with the Northeast Community Child Development Center in northeast Portland.
Education & Training
Undergraduate
Claremont McKenna College, B.S. Biology
Medical School
University of Southern California Keck School of Medicine
Residency
Internal Medicine, Legacy Emanuel and Good Samaritan Hospitals, Portland, OR
Certifications
Conditions Treated
Who is Dr. Harris right for?
Dr. Harris is well suited for adults managing chronic conditions including hypertension, diabetes, and cardiovascular disease. Her 17 years of inpatient hospital medicine give her particular depth with complex and multi-system conditions. Patients who want a physician with strong specialist relationships and experience navigating hospitalizations will find her background reassuring. She also serves patients focused on preventive health and long-term disease management.
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Frequently Asked Questions
Dr. Harris spent 17 years as a hospitalist at Providence Portland Medical Center before joining AIM Health. She managed complex inpatient cases and supervised resident physicians. She also served as a medical director in skilled nursing facilities, giving her deep experience across care settings.
Yes. Dr. Harris holds board certification in Internal Medicine from the American Board of Internal Medicine. She is also a Fellow of the American College of Physicians, a distinction that reflects her expertise and contributions to the field.
Yes. Portland Monthly Magazine named Dr. Harris a Top Doctor in Internal Medicine in 2013, 2019, 2020, 2024, and 2026. She also spent nearly a decade as supervising physician at the Portland Marathon Finish Line Medical Tent.
Dr. Harris focuses on internal medicine and primary care, with clinical depth in hypertension, diabetes, and preventive health. Her extensive hospitalist background gives her strong instincts for identifying and managing serious or escalating conditions.
Dr. Harris earned her medical degree from the University of Southern California Keck School of Medicine. She completed her residency in internal medicine at Legacy Emanuel and Good Samaritan Hospitals in Portland.
Yes. Dr. Harris served as supervising physician at the Portland Marathon Finish Line Medical Tent for nearly a decade. She also volunteered with the Northeast Community Child Development Center in northeast Portland.
Doctor profile last updated March 22, 2026