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About Us

Welcome

Your internist is a doctor that will provide you with non-surgical treatment of your injuries and any diseases. You shouldn’t take your health lightly.

Although most of the time small health issues are never more severe, it is important to have a trusted internist that can distinguish the difference and has the knowledge to make the correct diagnosis and recommend the proper treatment.

Your health is our number one priority and when you make your appointment with an internist they will be your first point of contact when you’re not feeling well, or you have any medical concerns you need addressed.

Gastroenterologist, Internist & Primary Care Doctor

Dr. Ronald Fagan

Gastroenterologist, Internist & Primary Care Doctor

Dr. Ronald Fagan is the leading internist, gastroenterologist, and primary care doctor based in Bethpage Farmingdale, NY. Dr. Ronald Fagan earned his medical degree from the Universidad Autónoma de Guadalajara Facultad de Medicina Tabasco. After completion of his medical degree, he then moved back to the United States to complete his residency and internship at Long Island Jewish Medical Center.

It was at the Brooklyn Hospital Center that Dr. Fagan went on to complete his fellowship of gastroenterology, and is now part of Long Island Medical Group and is also affiliated with Long Island Jewish Medical Center and North Shore Hospital.

Patients come to Dr. Fagan for a wide array of medical reasons, including annual physicals, ear infections, allergy testing, urinary tract infections, and sinus problems.

leading internist, gastroenterologist, and primary care doctor

Our Specialities

Caring for You with Expertise and Compassion

Our Services

LI Medical Group

LI Medical Group

LI Medical Group

LI Medical Group

LI Medical Group

LI Medical Group

Our Labs

Full Clinical lab with Fast reliable results

We are fully approved endoscopy and colonoscopy Site along with onsite anesthesia

We Accept a Wide Range of Insurance Plans

Making Healthcare Accessible

Testimonials

What Our Patients Say?

Have been a patient of Dr. Fagan for many years. He’s personable, thorough and attentive to my concerns. Staff is friendly, very compitent, efficient and courteous. Don’t mind waiting a little because I know he’s giving someone the attention they need and when it’s my turn, I will get that same level of attention and thoroughness. The office is well setup to handle Covid. I like that x-rays can be taken here and also that some procedures are done here in the office. I highly recommend Dr. Fagan to everyone.

- Michael Paparo

I have been going to LI Medical Group for a very long time. Dr. Horowitz is my physician, as well as my family’. He is a very thorough doctor, competent, knowledgeable and kind. My family and I had seek Dr. Horowitz for serious health issues, and he has always guided us through the right channels and had made sure that we get the services necessary obtain positive results. He is also compassionate, has an excellent bed side manner, down to earth and listens to his patience. My family and I believe Dr. Horowitz really care for his patients. I recommend him without hesitation. The staff at his office is kind, respectful, polite and helpful.

- Sara Lyman

The front reception are friendly, pleasant, and knowledgeable. The medical assistant was new and she was absolutely thorough professional and pleasant. The whole physical process was smooth, plus I am sick. I 100% refer anyone to this practice. Dr. Suarez is amazing and patient. He has knowledge I haven’t seen in a while. Thanks to the staff. Wonderful experience!

- Renie Ventura

Have been a loyal patient of Dr Fagan and his staff for ten years. They are very attentive and ensure all your needs are met. The entire staff is very educated and reacts with urgency. Dr Fagan is very personable and keeps good records and treats his patients like people not like a #. I recommend him to anyone of any age.

- Nathaniel Rivera

Staff

Meet our team

  • Dr. Orlando Suarez
  • Dr. Fagan
  • Dr. Stuart Horowitz
  • Dr. Marc Rybstein

Dr. Orlando Suarez

Dr. Orlando Suarez has been serving the people of New York for years as a primary care physician and internist. Dr. Suarez completed his medical degree at Universidad de Ciencias Médicas de Villa Clara Facultad de Medicina. He then completed his residency in internal medicine at New York University.

Dr. Fagan

Gastroenterologist, Internist & Primary Care Doctor

Dr. Ronald Fagan is the head gastroenterologist, internist and primary care physician at LI Medical Group, which is located on the Hempstead Turnpike in Bethpage Farmingdale, New York (Long Island). Dr. Fagan received his medical degree at the Universidad Autonoma de Guadalajara in Mexico. Following a stint at Long Island Jewish Medical Center (to finish his residency), he worked at the Brooklyn Hospital Center to complete a gastroenterology fellowship.

Dr. Stuart Horowitz

Dr. Stuart Horowitz was board certified in family medical practice in 1985 and boasts nearly 30 years of experience working in Long Island. A Brooklyn native who grew up in Long Island. After completing his undergraduate studies at Hofstra University, Dr. Horowitz received his medical degree from the College of Osteopathic Medicine and Surgery in Iowa in 1977. He then finished his internship at three different hospitals: Interboro Hospital, Massapequa General Hospital and Long Island Jewish Hospital.

Dr. Marc Rybstein

Dr. Marc Rybstein is a Long Island native and received his Bachelor’s of Science in Chemistry from New York University. There, he published multiple articles on chemistry and DNA in journals like the Journal of Inorganic Chemistry.

L.I. Medical Group