ONS Harrison, NY

ONS Physicians and Physical Therapy 
500 Mamaroneck Avenue, Suite 103, South Entrance, Harrison, NY 10528

Make an appointment online or call 203-869-1145. Toll free 800-999-9ONS.

Physicians Hours
Monday- Friday, 8:00 am – 5:00 pm

Physical Therapy Hours*
Monday – Thursday, 6:30 am – 7:30 pm
Friday, 6:30 am – 5:30 pm
Saturday, 7:00 am to 12:00 pm
*NOTE: The last PT appointment in the day is scheduled 1 hour prior to closing.

ONS Urgent Ortho Care Hours
Monday – Friday, 8:00 am – 12:00 pm, 1:00 pm – 5:00 pm

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.