Patient Reviews

Reviews reflect patients' level of satisfaction with the care they received from this provider. Dr. Alfonso Tan xhas an overall rating of 5.0.


Dr. Alfonso Tan, MD is a Doctor primarily located in Sayville, NY. He has 51 years of experience. His specialties include Internal Medicine. Dr. Tan is affiliated with Brookhaven Memorial Hospital, North Shore/Long Island Jewish Hospital System - Southside Hospital and Good Samaritan Hospital. He speaks English.


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Specialties & Expertise

Dr. Alfonso Tan has the following 7 areas of expertise and 1 specialty.

Internal Medicine

An internist is a physician who focuses on the diagnosis and treatment of conditions that affect the adult population—both acute and chronic.
These doctors are often who adults see as their primary physicians because they treat a broad range of illnesses that do not require surgical or specialist interventions. They also work to help a patient maintain optimal health in order to prevent the onset of disease.
In addition to treating the common cold and flu, internists also treat chronic diseases like diabetes and heart disease.


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Locations & Directions

Alfonso Tan MD

297 W Main St
Sayville, NY 11782

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