Paula Marchetta, MD, MBA

Located in New York, NY, Northwell Health Concorde Gastroenterology and Rheumatology at East 30th Street is a trusted medical service organization dedicated to providing top-notch gastroenterology and rheumatology services. With a focus on patient care and advanced treatments, our team of skilled professionals is committed to delivering personalized healthcare solutions to enhance the well-being of our patients.

Dr. Luis Barraza is a triple board-certified physician in Internal Medicine, Gastroenterology, and Obesity Medicine, committed to high-quality, patient-centered, and personalized care in digestive health. He earned his medical degree from the New York University School of Medicine, completed his Internal Medicine training at New York-Presbyterian/Weill Cornell Medical College, and advanced his expertise through the renowned Gastroenterology fellowship at New York-Presbyterian/Columbia University Irving Medical Center. During his fellowship, he also achieved certification in Obesity Medicine, further expanding his ability to address the complex connection between digestive health, nutrition, and weight management.Dr. Barraza is deeply passionate about colon cancer screening and prevention, viewing it as one of the most powerful tools in saving lives. He is dedicated to educating patients on the importance of early detection, while ensuring each individual feels supported and cared for during every step of the process. With a compassionate approach, he strives to make even the most complex or sensitive procedures comfortable and accessible, tailoring care to each patient's needs.Dr. Barraza practices evidence-based medicine grounded in the latest research and guideline-driven recommendations. He recognizes that the foundation of lasting health depends on the basic building blocks of wellness nutrition, physical activity, and mental-emotional well-being and partners with patients to strengthen each of these areas. When appropriate and supported by scientific data, he thoughtfully incorporates natural and integrative therapies into care plans, ensuring a holistic approach that aligns medical excellence with the individual needs and values of his patients.His clinical expertise encompasses a wide range of gastrointestinal conditions, including reflux disease, inflammatory bowel disease (Crohn's disease and ulcerative colitis), celiac disease, irritable bowel syndrome, peptic ulcer disease, swallowing disorders, chronic constipation, and liver diseases such as fatty liver, hepatitis, cirrhosis, and obesity-related complications.In his practice, Dr. Barraza performs procedures including upper endoscopy, colonoscopy, stricture dilation, BRAVO pH monitoring, esophageal variceal banding, and video capsule endoscopy. Whether preventing colon cancer through timely screenings or managing complex digestive disorders, Dr. Barraza combines medical excellence with a genuine commitment to compassionate, patient-centered careDr. Barraza finds great fulfillment in building strong, lasting relationships with his patients and is fluent in both English and Spanish, allowing him to connect with a diverse community. He takes pride in delivering compassionate, comprehensive, and individualized care that reflects his commitment to excellence. Recognized by his peers for his dedication and skill, Dr. Barraza has been honored as a Rising Stars Honoree for three consecutive years, including 2025. Dr. Barraza completed his first NYC Marathon in 2023.

John J. Ackert, MD, is a distinguished gastroenterologist affiliated with Concorde Medical Group, based in their Kips Bay office in New York City. He boasts extensive education credentials, having completed his medical training at New York University School of Medicine and gained considerable experience at Bellevue Hospital. Dr. Ackert is an active researcher in the field of gastroenterology, with published contributions in noted medical journals, including Gastroenterology and The American Journal of Gastroenterology. He serves as an Assistant Professor at the Donald and Barbara Zucker School of Medicine at Hofstra Northwell, highlighting his commitment to both clinical practice and medical education. Generated from the website