Schedule an Appointment

in GREENWICH or STAMFORD, CT, or HARRISON, NY 

Office Hours: Monday through Friday, 8:00 a.m. to 5:00 p.m.

Call 203.869.1145 or 800-999-9ONS, or complete the following Appointment Request form. You will be asked to provide your insurance card information.

Insurance Information

Please bring to your appointment:

  • Current insurance card
  • List of current medications and medical conditions
  • Primary-care physician address and phone number and contact information for any physicians involved with your care
  • Recent diagnostic images such as CTs, MRIs, x-rays, bone scans, or EMGs

Expedite your check-in and registration: Patients who are new to ONS or who have not visited our offices in more than a year should complete the patient registration form on our Patient Portal. Patients that do not register on the patient portal, must arrive 20 minutes before their appointment time to complete paperwork.

Note: We require 24 hours notice to cancel an appointment.


On-line Appointment Request Form

You may use the following form to request an appointment and someone will call you to schedule: