ONS Greenwich

COVID-19 Appointment Policy

  • All patients and staff are temperature and symptom screened upon arrival to the office.
  • Patients and visitors must wear face covering to all appointments.  If you arrive for your appointment without a face mask you will be asked to reschedule your appointment.
  • Patients may bring one guest with them to their appointment.
  • Children may be accompanied by one parent. 
  • Waiting areas have been redesigned for socially distancing.  You may be asked to wait in your car if safe seating is not available.
  • Patients are asked to complete all medical forms using their own devices to avoid using the office tablets.

ONS TELEHEALTH appointments are available for all patients.  Call 203-869-1145 during regular business hours to schedule. 

Medical Offices, Physical Therapy and MRI Center
6 Greenwich Office Park, Greenwich, CT 06831
Monday – Friday, 8:00 am – 5:00 pm

Urgent Orthopedic Care
Monday – Thursday, 5:00 pm – 8:00 pm
Friday, 8:00 am – 5:00 pm
Saturday, 12:00 pm – 4:00 pm

Physical Therapy 
Monday – Friday,  7:00 am – 5:00 pm

MRI CENTER
Monday – Friday, 8:00 am – 5:00 pm

ONS Business and Corporate Offices
9 Greenwich Office Park, Greenwich, CT 06831

ONS Physicians in Greenwich

ONS Greenwich Office

Paul Apostolides, MD

Neurosurgery

Jonathan L. Berliner, MD

Hip & Knee Replacement, Revision

Mark H. Camel, MD

Neurosurgery

Matthew Cantlon, MD

Hand, Wrist & Elbow

Michael R. Clain, MD

Foot & Ankle

James G. Cunningham, MD

Sports Medicine, Shoulder & Knee

Demetris Delos, MD

Sports Medicine, Shoulder & Knee

Frank A. Ennis, MD

Hip & Knee Replacement, Revision

Amory J. Fiore, MD

Neurosurgery

R. Tim Greene, MD

Sports Medicine, Hip & Knee

Jeffrey M. Heftler, MD

Interventional Physiatry, Rehabilitation

Steven E. Hindman, MD

General Orthopedics, Trauma

Brian F. Kavanagh, MD

Hi & Knee Replacement, Revision

Tamar Kessel, MD

Interventional Physiatry, Rehabilitation, Sports Medicine, EMG

Marc S. Kowalsky, MD

Sports Medicine, Shoulder, Elbow & Knee

Alex Levchenko, DO

Interventional Physiatry, Sports Medicine, EMG

Seth R. Miller, MD

Shoulder Replacement, Comprehensive Shoulder

Paul M. Sethi, MD

Sports Medicine, Shoulder, Elbow, Knee, Shoulder Replacement

Christopher S. Sahler, MD

Interventional Physiatry, Sports Medicine, EMG

Scott L. Simon, MD

Neurosurgery, Scoliosis

Katherine Vadasdi, MD

Sports Medicine, Shoulder, Elbow, Knee, Shoulder Replacement

Mark A. Vitale, MD

Hand, Wrist & Elbow

David H. Wei, MD

Hand, Wrist & Elbow

Mark Yakavonis, MD

Foot & Ankle


Physical Therapists in Greenwich

New Patients

For New Patients, or if you have not visited our offices in more than a year, please arrive 30 minutes prior to your scheduled appointment time to complete your registration.  To save time, the registration form and medical history form can submitted online through the Patient Portal.

Please also bring the following items to your appointment:

  • Insurance card

  • List of current medications and medical conditions

  • Primary-care physician address and phone, and contact information for other physicians involved with your care

  • Recent diagnostic images such as CTs, MRIs, x-rays, bone scans, or EMGs. Bring both original films and copies of reports.