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Narragansett Family Medicine

Our Clinicians

Looking to become a Coastal patient? Click here to view a list of our practices accepting new patients.

Please Note: The "Book an Appointment" option is for existing patients only.

Michael J. Gonzalez, MD

Dr. Gonzalez earned his medical degree from the former Emilio Aguinaldo College of De La Salle University in the Philippines in 1992. His residency was at St. Clare’s Hospital in Schenectady, NY where he was chief resident from 2003-2004.

Dr. Gonzalez is Board Certified in Family Medicine and is a member of both the American Academy of Family Physicians and the Rhode Island Medical Society.


Karen Elaine Johnson, NP

Karen Johnson earned a master of science in Nursing - Family Nurse Practitioner from the University of Rhode Island. Prior to joining Coastal Medical, Karen worked as Nurse Practitioner for Brown Medicine. She is a self-professed lifelong learner. Karen's additional professional interests are in diverse nursing specialties such as diabetes, oncology and critical care. 

Dariusz Kostrzewa, MD

Dr. Dariusz Kostrzewa is a Board Certified Family Medicine Physician. He completed is residency at Memorial Hospital of Rhode Island, Pawtucket, RI.

Professional Organizations:
American Family of Family Physicians, RI Academy of Family Physicians and RI Medical Society.



Meredith Lafontaine, PA

Meredith Lafontaine received her Masters of Science in Physician Assistant Studies and her Bachelors of Science in Health Sciences from Springfield College. Before joining Coastal Medical, she worked at Atwood Medical Associates gaining primary care experience and at the Atmed Treatment Center where she gained experience in the urgent care setting. Meredith now works in Coastal Medical’s Narragansett Family Medicine office.