ONS Harrison, NY

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.
  • Adult patients are asked to come alone.
  • 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.  Patients can self-schedule these appointments at any time, call 203-869-1145 during regular business hours, or request an appointment online.

Read the new urgent ortho care policy

Medical Offices 

500 Mamaroneck Avenue, South Entrance
Harrison, NY  10528

Monday – Friday, 8:00 am – 5:00 pm

Urgent Ortho Care, by appointment only. 

Monday – Friday, 8:00 am – 5:00 pm

Physical Therapy

Monday – Friday, 7:00 am – 5:00 pm

NOTE: The last physical appointment of the day is scheduled one hour before closing.


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.