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.

500 Mamaroneck Avenue, Ground Floor, south entrance, Harrison, NY 10528
Open: Monday- Friday | 8:00 a.m. to 5:00 p.m.

DIRECTIONS SOUTHBOUND

FROM I-95 South

  • Take I-95 SOUTH
  • In New York, take Exit 18 B for Mamaroneck Avenue West toward White Plains
  • In approximately 1.2 miles, ONS at 500 Mamaroneck Avenue will be on the right
  • Enter through the South Entrance

FROM MERRITT/HUTCHINSON RIVER PARKWAY SOUTH

  • Take Exit 23 South to Mamaroneck Avenue toward Mamaroneck
  • Go approximately 0.5 miles and make a U-Turn on Mamaroneck Avenue
  • ONS at 500 Mamaroneck Avenue is on the right
  • Enter through the South Entrance

NORTHBOUND

FROM I-95

  • Take  I-95 NORTH
  • Take Exit 18B for Mamaroneck Avenue West toward White Plains
  • In approximately 1.2 miles, ONS at 500 Mamaroneck Avenue will be on the right
  • Enter through the South Entrance

FROM HUTCHINSON RIVER PARKWAY NORTH

  • Take Exit 23 South to Mamaroneck Avenue toward Mamaroneck
  • At the third traffic light, turn left into the 2nd entrance to 500 Mamaroneck Avenue, South. (Important: Google maps directs you to the 2nd light and North Entrance. Do not enter the North entrance.)
  • ONS is on the left. Parking is in front of the entrance.

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