About
Erinn Beagin, MD brings over 20 years of internal medicine experience to her Princeton, New Jersey practice. She earned her Bachelor of Arts in Biology, Magna Cum Laude, from Drew University in 1997 before completing her medical degree at New York Medical College in 2001. She then completed her internship, internal medicine residency, and geriatric medicine fellowship at the University of Medicine and Dentistry of New Jersey, Robert Wood Johnson Medical School.
Dr. Beagin holds board certifications from the American Board of Internal Medicine in internal medicine, geriatric medicine, and hospice and palliative care. She also holds the Certified Medical Director designation. Since 2013, she has served as Division Chief of Geriatrics at Saint Peter's University Hospital, where she also sits on the Ethics Committee. She has served as Medical Director of Parker at Monroe Long Term Living Community since 2015. Castle Connolly has recognized her as a Top Doctor every year from 2015 through 2024, and New York Magazine named her a Top Doctor from 2021 through 2024. Her care philosophy centers on treating the whole person across all stages of life. She values learning about each patient's work, family, interests, and personal goals alongside their medical history.
Education & Training
Undergraduate
Drew University, Madison, NJ - Bachelor of Arts, Biology, Magna Cum Laude, 1997
Medical School
New York Medical College, Valhalla, NY - Doctorate of Medicine, 2001
Residency
University of Medicine and Dentistry of New Jersey, Robert Wood Johnson Medical School, New Brunswick, NJ - Internship and Internal Medicine Residency
Fellowship
University of Medicine and Dentistry of New Jersey, Robert Wood Johnson Medical School, New Brunswick, NJ - Geriatric Medicine Fellowship
Additional Training
Certified Medical Director designation; Division Chief of Geriatrics, Saint Peter's University Hospital (since 2013); Medical Director, Parker at Monroe Long Term Living Community (since 2015)
Certifications
Conditions Treated
Who is Dr. Beagin right for?
Dr. Beagin is an excellent fit for adults seeking a primary care physician with deep expertise across the full arc of aging. Patients managing chronic conditions, complex medical histories, or multiple specialists benefit from her internal medicine and geriatric training. Those navigating serious illness or end-of-life planning find her hospice and palliative care certification especially valuable. Her whole-person philosophy suits patients who want their doctor to understand their life, not just their lab results.
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Frequently Asked Questions
Dr. Beagin specializes in internal medicine, geriatric medicine, and preventive care. She treats chronic conditions common in adults and older patients, including cardiovascular disease, diabetes, and age-related health concerns. Her hospice and palliative care certification also allows her to support patients and families navigating serious or terminal illness.
Yes. Dr. Beagin holds triple board certification from the American Board of Internal Medicine in internal medicine, geriatric medicine, and hospice and palliative care. She also holds the Certified Medical Director designation.
Dr. Beagin earned her medical degree from New York Medical College in 2001. She completed her internship, residency, and geriatric medicine fellowship at the University of Medicine and Dentistry of New Jersey, Robert Wood Johnson Medical School.
Yes. Castle Connolly recognized Dr. Beagin as a Top Doctor every year from 2015 through 2024. New York Magazine also named her a Top Doctor from 2021 through 2024.
Dr. Beagin treats each patient as a whole person. She considers the physical, mental, spiritual, and social dimensions of health when building a care plan. She takes time to learn about each patient's work, family, interests, and personal goals alongside their medical history.
Yes. Geriatric medicine is one of Dr. Beagin's three board certifications. She has served as Division Chief of Geriatrics at Saint Peter's University Hospital since 2013. She also serves as Medical Director of Parker at Monroe Long Term Living Community.
Dr. Beagin maintains affiliations with Penn Medicine Princeton Health and St. Peter's University Hospital. She also sits on the Ethics Committee at St. Peter's University Hospital.
Yes. Members reach Dr. Beagin directly by phone after hours and on weekends. The practice provides 24/7 physician access as part of the MDVIP membership.
Doctor profile last updated March 21, 2026