Dr. Teresa Alfonso, MD
Internist
6498 Coral Way
Miami, FL 33155
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195 providers
Availability last updated 03/06/2026
Dr. Teresa Alfonso, MD
Internist
6498 Coral Way
Miami, FL 33155
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Board-Certified Dermatologist | Medical, Pediatric & Cosmetic Dermatology Specialist
Dr. Costner McKenzie is a board-certified dermatologist at the Skin Institute of New York (SINY®), providing comprehensive dermatologic care to adult and pediatric patients in Manhattan. With expertise in both medical and cosmetic dermatology, Dr. McKenzie combines academic excellence, research leadership, and compassionate patient care to deliver individualized, evidence-based treatment plans.
Schedule an Appointment with Dr. McKenzie
Dr. McKenzie’s academic and clinical training reflect a deep commitment to excellence:
At Northwestern, Dr. McKenzie’s academic performance and dedication to medicine earned him membership in Alpha Omega Alpha, recognizing exceptional academic achievement and professionalism. During residency at NYU, he refined his diagnostic, surgical, and cosmetic skills under nationally recognized leaders in dermatology and served as Chief Resident in his final year.
Dr. McKenzie provides comprehensive dermatologic care with special focus on:
His clinical and research interests also include health disparities in dermatology, reflecting his commitment to equitable and inclusive skin care for patients of all backgrounds
Dr. McKenzie is known for combining scientific rigor with a highly personalized approach, ensuring each patient feels heard, supported, and confident in their treatment plan.
Dr. McKenzie is a well-published author with research featured in respected dermatology journals. He has presented his work at national and international meetings, contributing to advancements in the understanding and treatment of eczema, acne, hair loss, and dermatologic health disparities
He remains actively involved in medical education and is committed to mentoring and training future dermatologists.
Patients consistently describe Dr. McKenzie as personable, knowledgeable, and exceptionally attentive. Many highlight his outstanding bedside manner, noting that they never feel rushed and always feel fully heard. He is frequently praised for clearly explaining diagnoses and treatment options, providing structured care plans, and ensuring patients leave feeling confident and informed.
Patients also commend the professionalism and friendliness of the SINY team, efficient scheduling, and welcoming office environment
Patients consistently describe Dr. McKenzie as personable, knowledgeable, and exceptionally attentive. Many highlight his outstanding bedside manner, noting that they never feel rushed and always feel fully heard. He is frequently praised for clearly explaining diagnoses and treatment options, providing structured care plans, and ensuring patients leave feeling confident and informed.
Patients also commend the professionalism and friendliness of the SINY team, efficient scheduling, and welcoming office environment.
Dr. McKenzie sees patients at two SINY Dermatology locations in Manhattan, offering convenient access to expert dermatologic care.
69 E 76th St, New York, NY 10021
Phone: 800-778-3090
Hours:
Serving patients from: Upper East Side, Lenox Hill, Carnegie Hill, Yorkville, Midtown East, Roosevelt Island, Upper West Side, East Harlem, and surrounding Manhattan communities.
Schedule an Appointment at Upper East Side
1000 Park Ave, New York, NY 10028
Phone:800-778-3090
Hours:
Serving patients from: Upper East Side, Carnegie Hill, Lenox Hill, Yorkville, Midtown East, Central Park East, and surrounding Manhattan neighborhoods.
Schedule an Appointment at Park Avenue
Dr. McKenzie accepts a wide range of major insurance plans, including:
Additional plans accepted. Patients are encouraged to contact SINY Dermatology to confirm coverage prior to their visit.
The Skin Institute of New York is a leading dermatology group providing medical, surgical, and cosmetic dermatology services across New York. SINY Dermatology physicians combine academic excellence, clinical research, and patient-focused care to deliver advanced skin treatments tailored to each individual.
Dr. Costner McKenzie, MD
Internist
15071 S FL-7
Suite 300
Delray Beach, FL 33446
Jorge Diaz Valdes, MD
Internist
9495 Sw 72nd St.
Ste B250
Miami, FL 33173
