• At A Glance
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  • Insurance
  • Profile Video
    Dr. Mark Gilder received his BS from Emory University in 1983. In 1987, he obtained his medical degree from New York Medical College. Dr. Gilder completed his surgical internship and residency at North Shore University Hospital in 1992. In 1993, he completed his fellowship in Colon & Rectal Surgery at Saint Francis Medical Center affiliated with University of Connecticut. He joined Associates in Colon & Rectal Diseases in June 1993.

    Dr. Gilder is board certified in General Surgery and Colon & Rectal Surgery. He is a member of numerous national societies in General Surgery and Colon & Rectal Surgery. He is past president of the New Jersey Colon & Rectal Society. He is a Fellow of the American College of Surgeons along with the American Society of Colon & Rectal Surgeons. He has also served as Chairman of the Division of Colon & Rectal Surgery at Cooperman Barnabas Medical Center.

    Dr. Gilder has served as a consultant for surgical instrument manufacturers. He is highly skilled in endoscopy and has performed thousands of colonoscopies. His expertise is minimally invasive intestinal surgery, therapeutic high-risk colonoscopy, endorectal ultrasound, and anorectal surgery. He remains an active clinical instructor at Cooperman Barnabas Medical Center.

    Dr. Gilder’s honors include being named to “Castle Connolly Top Doctors New York Metro Area” in 2007 and “New York Magazine Best Doctors” in 2008. Recently, he was named to “Inside Jersey” magazine 2009 Top Doctors Issue.

    His interests include spending time with his wife and two daughters along with golf and skiing.

    Dr. Gilder is a recipient of the 2014 NJ monthly Top Docs award.

    Philosophy of Care:

    Our goal is to provide the best and most contemporary surgical services available. Patients are actively involved and participate in their management throughout their course of treatment. We work closely with other physicians and health care providers to deliver the ultimate in care.

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    Clinical Interests


    Minimally Invasive Abdominal Surgery (Robotic and Laparoscopic approaches for diseases involving the small and large bowel), Conventional Open surgery for the small and large bowel Colectomy (Low Anterior resection, Left colectomy, Right Colectomy, Proctectomy) Lower intestinal endoscopy (colonoscopy (screening / surveillance), polypectomy, EMR, Stent procedures Anorectal Surgery: Hemorrhoidectomy, Fistula, Abscess, LIFT procedure, Seton Placement


    Benign and Malignant conditions affecting the small and large bowel (Cancer, Inflammatory Bowel Disease, Premalignant Polyp Syndromes, FAP, Ulcerative Colitis, Crohns Disease) Colonoscopy Screening and Therapeutic procedures, complex polyp removal

  • Medical School

    New York Med College, NYC, NY


    North Shore University Hospital, Manhasset, NY


    North Shore University Hospital, Manhasset, NY


    St Francis Hospital, Hartford, CT

  • Insurance

    Accepted Health Plan information is only as accurate as the most current information submitted. Prior to your appointment, it is advisable to verify with a physician office that they are still a participating provider.

    • Aetna
    • Aetna Better Health
    • Aetna Medicare
    • Centivo
    • CHN
    • Cigna
    • Cigna Health Springs
    • Cigna Medicare
    • Clover Health
    • DOL
    • Emblem
    • Fidelis (WellCare)
    • Horizon
    • Horizon Casualty
    • Horizon NJ Health
    • Humana Medicare
    • Humana Tricare
    • Longevity
    • Magnacare
    • Medicaid
    • Medicare
    • Multiplan
    • Northwell
    • Qualcare
    • UHC/OX
    • UHCCP
    • US Family Health Plan
    • WellPoint (Amerigroup)