Welcome to Vanguard Gastroenterology Clinic

Welcome to Vanguard Gastroenterology, your premier destination for comprehensive digestive health care. Our experienced team offers personalized GI consultations, advanced procedures such as colonoscopies and upper endoscopies, in-office infusion therapies, integrative weight management programs, hemorrhoid treatments, screening colonoscopies, IV therapy in Midtown, EUS procedures, and fecal microbiota transplants, and much more!  Trust Vanguard Gastroenterology to help you achieve optimal digestive health. Schedule your appointment today and experience our outstanding services.

Our Physicians

Meet our Physicians: Experienced experts in digestive health, dedicated to providing personalized care and accurate diagnoses. Our skilled team stays up-to-date with the latest advancements in gastroenterology to offer the most effective treatments available. With a patient-centered approach, we prioritize your well-being and strive to build strong doctor-patient relationships based on trust and open communication. Trust our physicians at Vanguard Gastroenterology to guide you towards optimal digestive health. Schedule an appointment with our exceptional team today.

Conditions We Treat

  • Barrett’s Esophagus
  • Celiac Sprue
  • Colon Cancer / Polyps
  • Constipation
  • Crohn’s Disease
  • Diverticulitis Treatment
  • Eosinophilic Esophagitis
  • Gastritis
  • Peptic Ulcers
  • Ulcerative Colitis
  • GERD / Acid Reflux
  • H. Pylori
  • Hemorrhoids
  • Hepatitis
  • Hiatal Hernia
  • Irritable Bowel Syndrome
  • Inflammatory Bowel Disease
  • Lactose Intolerance
  • Pancreatitis

Vanguard GI: Recognizing Excellence

  • Ryan A.
    Ulviyya is the best, makes infusions very easy. Highly recommend Dr. Salik. Great experience with Vanguard.
    Ryan A.
  • Joe K.
    Ulviyya is great , good patient bedside manner. Always going above and beyond to accommodate additional requests!
    Joe K.
  • Tom O.
    Ulviyya was an amazing infusion nurse. I was new to receiving treatments via infusion and her professionalism and warmth aided me immensely during my acclimation. Having someone there to guide me through the medical and emotional adjustments was a huge help and I couldn’t be more thankful.
    Tom O.
  • Katherine D.
    Knowledgeable and professional service provided by Dr. Chung, N. Also excellent customer service from the staff!!
    Katherine D.
  • Deborah W
    I recently had the pleasure of being referred to Dr Khaykis. She is delightful and has a very sweet bedside manner. She made me feel very comfortable and explained everything to me thoroughly. I am very pleased with my experience and would refer her to any friend who needs care from a Gastroenterologist.
    Deborah W
  • Arianna P.
    Doctor had one of the loveliest bedside manners I have ever encountered.
    Arianna P.
  • Ioannis S.

    Dr Brettholz is a Great doctor. He definitely knows what he’s talking about. Very experienced and makes you feel very comfortable. Highly recommended!

    Ioannis S.
  • Dino D.

    My wife and I had colonoscopy screenings with Dr. Friedlander. He is a warm human being and excellent physician. He and his staff made the experience very comfortable. Many thanks!

    Dino D.

About Insurance

Does Smart Choice accept insurance?


What are the reasons for the direct primary care and pay-out-of-pocket option?


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Will I receive a bill?


How is the clinic staffed?