Contact Us


5 Cuba Hill Road
Greenlawn, NY 11740
East Entrance – Suite 200
West Entrance – Suite 100

Phone: 631-628-5000

Office Hours:
Monday through Friday: 8:00 am to 6:00 pm
Saturday: 9:00 am to 3:00 pm

Advanced Radiation Centers of New York
5 Cuba Hill Road, Suite 400
Greenlawn, NY 11740

Phone: 631-544-3400

59 Southern Boulevard
Nesconset, NY 11767 

Phone: 631-659-1700
Fax: 631-659-1750

Office Hours:
Monday through Friday: 8:00 am to 6:00 pm
Saturday: 8:00 am to 2:00 pm

61 Southern Boulevard
Nesconset, NY 11767
Phone: 631-659-1800
Fax: 631-382-4836
Phone: 631-659-1850
Fax: 631-382-4836

Office Hours:
Monday through Friday: 8:00 am to 6:00 pm

Scheduling an Appointment

Patients are seen by appointment only. Patients should call early in the day to ensure they will be accommodated. For urgent care needs, patients may be seen by their primary care physician. If their primary care physician is unavailable, another physician in the same department designated to see urgent care cases will attend to the patient. Our state-of-the-art electronic medical records system enables physicians to access important patient information in a timely manner.

Should the medical need arise, primary care physicians will refer patients for specialty care.

Contacting Your Physician

Each physician establishes his or her own policies regarding telephone calls. In general, our physicians are not available to take calls during patient hours. Phone calls will be returned promptly by either the physician or a physician representative during breaks in the schedule, or after hours. After-hours calls will be connected to our answering service, which will contact a physician for you.

Medical attention is available 24 hours a day, 7 days a week.

Payment Options

Before your visit, please understand your insurance plan requirements and what services your plan covers, including routine preventive care. Non-covered services are the financial responsibility of the patient.

For patients with participating managed care plans, we require payment of the co-payment at the time of your visit. For patients with commercial insurance plans, full payment of the visit is required.

Mount Sinai Doctors Long Island accepts cash, personal checks, credit cards, and debit cards. Please notify our Central Registration staff of any changes to your insurance plan, as well as changes to your address or telephone number.

Payments can be made online. Click Make a payment on the top navigation bar.

The Mount Sinai Doctors Long Island Billing Department and Administrative Offices are located at:

5 Cuba Hill Road
Greenlawn, NY 11740

Phone: 631-628-5000
Monday to Friday, 8:30 am to 4:30 pm

Coming soon…

Mount Sinai Doctors – West Islip
500 Montauk Highway, Suite S
West Islip, NY 11795