GREENWICH, CT, HARRISON, NY and STAMFORD, CT
Call 203.869.1145 or 800-999-9ONS to make an appointment or request an appointment online.
You will be asked for your insurance card information when you call.
Note: We require 24 hours notice to cancel an appointment.
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 other physicians involved with your care
- Recent diagnostic images such as CTs, MRIs, x-rays, bone scans, or EMGs
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 the ONS Patient Portal. If you do not pre-register on the patient portal, you will need to arrive 20 minutes before your appointment time to complete paperwork. This will expedite your check-in.
On-line Appointment Request Form
You may also use the following form to request an appointment and someone will call you to schedule: