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Phillip T. Guillen, MD, is a Board Certified Long Island based orthopedic surgeon who is fellowship trained to provide comprehensive, state-of-the-art surgery for the bones, joints, tendons, nerves and muscles of the hand and upper extremity for both adults and pediatric population. Most recently, he completed a hand and upper extremity surgery fellowship at the prestigious Stony Brook Medical Center in Long Island, N.Y. He wanted to bring world-class training and innovative surgical techniques from around the country to his practice having trained along the West Coast, Midwest and East Coast.


Providing care for all orthopedic problems, Dr. Guillen’s practice focuses on operative and non-operative treatment of shoulder, elbow, and hand problems. Specifically, Dr. Guillen offers endoscopic carpal tunnel, trigger finger, cysts and mass excisions; Tommy John surgery of the elbow, Xiaflex for dupytrens, microsurgery, and treating hand crush, nerve and tendon injuries. An extensive list of conditions treated can be found below. He also is trained in complex tendon and nerve reconstruction for permanently damaged nerves and arm and hands. He also is trained and performs total and reverse total shoulder replacements routinely for arthritic and post-traumatic shoulder conditions. In addition he treats all upper extremity/finger fractures.


He routinely attends conferences to stay up-to-date on the latest cutting edge technology implementing proven techniques in his practice. Stem cell and PRP injections are also offered. He has trained at multiple level 1 hospitals and worked within a large metropolitan region as well as rural hospitals treating farming and industrial injuries.


Academically, Dr. Guillen has researched and published numerous peer-reviewed articles and presented nationally and internationally.


Dr. Guillen is a humanitarian who has volunteered his medical knowledge to assist victims of such natural disasters as the earthquakes in Nepal and Nicaragua. His bilingual skills have complemented his humanitarian efforts both in the United States and abroad.


Dr. Guillen is a family man who enjoys spending time with his wife, Alexa, and their sons, Grayson and Preston. Dr. Guillen cherishes the community feel of Smithtown and is overjoyed to be practicing in Long Island, NY.


Seattle University

Magna Cum Laude with a B.S. in Biochemistry Graduated in 2006

University of Nebraska Medical Center

Graduated with Distinction in 2010 Received Avicenna Award

Internship/Residency Hospital

Loma Linda University Medical Center Loma Linda, California Orthopaedic Surgery; completed in 2015

Fellowship Hospital

Lawrence Hurst Hand Surgery Fellowship, Stony Brook University Medical Center, Stony Brook, NY Completed in 2016

Languages Spoken




AAOS (American Association Orthopedic Surgery)

Candidate Fellow ASSH (American surgical society of Hand)

EWAS (European wrist arthroscopy society)

AAHS (American association for hand surgery)

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American Association for Hand Surgery badge
American Society for Surgery of the Hand button
American Academy of Orthopaedic Surgeons badge
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