ONS Harrison, NY

COVID-19 Update

The ONS Harrison office is not accepting appointments at this time. 

For safety and to allow for social distancing guidelines, patients with truly urgent orthopedic needs must make an appointment at the Greenwich office, Monday through Saturday, between 12:00 pm – 4:00 pm. 

Read the new ONS Urgent Care policy. Call 203-869-1145 for an appointment.

Physical Therapy appointments for essential therapeutic treatments are available at the ONS Greenwich and Stamford facilities, Monday through Friday, between 12:00 pm -4:00 pm.

All patients with conditions that do not require an in-person visit can schedule an ONS TeleHealth appointment to have a virtual face-to-face visit with an ONS physician for a variety of matters, including evaluation of treatment plan, discussion of X-ray and MRI test results and to determine if further testing or an in-office visit is necessary.  Call 203-869-1145 and one of our experienced representatives will help you get started. 

Thank you for your patience and understanding during this serious health crisis.



Physicians in Harrison

Jonathan Berliner, MD 


Hip and Knee Replacement & Revision

Mark Camel, MD



Michael Clain, MD


Foot and Ankle

Tim Greene, MD


Sports Medicine, Hip & Knee

Marc Kowalsky, MD


Sports Medicine, Shoulder, Elbow & Knee

Alex Levchenko, DO


Interventional Physiatry, Sports Medicine, EMG

Seth Miller, MD



Paul Sethi, MD


Sports Medicine, Shoulder, Elbow & Knee

David Wei, MD


Hand, Wrist & Elbow

Mark Yakavonis, MD


Foot and Ankle

Harrison Physical Therapists

New Patients

New Patients or patients who have not visited ONS in more than a year, please arrive 15 minutes prior to your scheduled appointment time to complete your registration or save time by completing the forms online through the Patient Portal.  Also please also bring the following 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.