About Us

We Are LI MEDICAL GROUP A Medical Clinic

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.

Your Health is Our Priority

If you’re in need of a reliable internist in Long Island then the offices of Dr. Ronald Fagan are here to help you with all of your medical needs.

Contact Us

Our Staff

Dr. Fagan

Dr. Ronald Fagan is the head gastroenterologist, internist and primary care physician at LI Medical Group, which is located on the Hempstead...

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...

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...

Dr Team

When you’re not feeling well you shouldn’t leave your health up to a professional who doesn’t care about their patients well being and only wants to rush you out of their office with little to no help. Dr. Fagan and his staff will ensure that you are seen in a timely manner and will give you all the options available to help you. If you are in need of an internist in Long Island then call us today at (516)752-7000.


Your Guide to Smooth Clinic Visits: Managing Health Insurance Claims with Ease
18 Jul

Your Guide to Smooth Clinic Visits: Managing Health Insurance Claims with Ease

Processing health insurance claims does not need to be a stressful job. Preparing clinical visits, complying with insurance plan terms, and being aware of different organizing techniques help avoid difficulties. Learning more about how to get reimbursed for medical expenses can help reduce clinic visit stress and, accordingly, improve the overall experience. In this guide, …

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Your Health is Our Priority: The Mission of LI Medical Group
18 Jul

Your Health is Our Priority: The Mission of LI Medical Group

At LI Medical Group, we know that your health is the cornerstone of your well-being and happiness. As a committed clinical health center, our mission is to ensure that each affected person gets complete, compassionate, and personalized care.  Our experienced internist staff is committed to delivering non-surgical solutions for a wide variety of health conditions. …

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4 Apr

Allergy Testing- Why And When Should You Go For It?

Allergy is a condition in which the immune system of a human body…

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