Your journey begins here. Contact us to schedule your initial consultation with one of our spine specialists. Our friendly staff will guide you through the process and set up your appointment.
West Islip & Riverhead newly relocated to Catholic Health locations: Learn More
Dr. Mermelstein is a Board Certified Orthopaedic Surgeon in Commack, NY with additional Fellowship training and extensive experience in pediatric and adult spinal deformities, sports-related spinal injuries, and degenerative and traumatic conditions of the neck and back. He is recognized as one of the leading experts in managing the care and treatment of pediatric scoliosis patients and is an active member of the premier Scoliosis Research Society.
As the first surgeon on Long Island to perform the Posterolateral Endoscopic Discectomy procedure, he continues to lead the field in laser surgery and minimally-invasive techniques, which reduce pain and the risk of infection while also making recovery quicker. He has pioneered new intra-operative neurophysiological monitoring procedures to improve surgical safety. His expertise includes complex reconstructive spine surgery, disc arthroplasty (disc replacement), pediatric scoliosis, and laser surgery.
Highly respected in the field of spine, he has lectured extensively at national and international meetings regarding spinal biomechanics and instrumentation.
Dr. Mermelstein’s passion for spine care is reflected in his willingness to share his knowledge and expertise by providing professional seminars and community lectures on spine health.
Dr. Mermelstein’s commitment to give “Back” is evident by his partnering with charitable organizations dedicated to improving the lives of children around the world, donating his time and skills to provide life-altering surgery to improve the quality of their lives.
In 2020, Dr. Mermelstein was appointed as Clinical Assistant Professor in the Department of Science Education at the School of Medicine of HOFSTRA University.

565 Hempstead Turnpike
West Hempstead, NY 11552
Phone:(631) 837-2359
At Long Island Spine Specialists, we understand that every spine condition is unique. Our team of experts, including nationally recognized surgeons, are dedicated to providing personalized care using the latest non-invasive and minimally invasive treatments for neck and back pain on Long Island, NY.
Your journey begins here. Contact us to schedule your initial consultation with one of our spine specialists. Our friendly staff will guide you through the process and set up your appointment.
During your visit, our diagnostic process begins with a thorough examination. We'll review your medical history, assess your range of motion, and evaluate any areas of pain or discomfort. If necessary, we may recommend imaging tests such as X-rays or MRIs to get a clearer picture of your condition.
Based on our comprehensive evaluation, we'll develop a tailored treatment plan designed to address your specific needs. This may include non-invasive therapies, minimally invasive procedures, or advanced surgical options when necessary. Our goal is to create a path to relief that works best for you.
Take the first step towards a pain-free life with Long Island Spine Specialists.