Schedule an Appointment

in GREENWICH or STAMFORD, CT, or HARRISON, NY 

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

Call 203.869.1145 or 800.999.9ONS, or complete the Appointment Request form. You will be asked for your insurance card information.

Insurance Information

Bring with you 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: 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. Patients that do not register on the patient portal, must arrive 20 minutes before their appointment time to complete in office.

Note: 24 hours cancellation notice required


On-line Appointment Request Form

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