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Contact Quadax Client Support


Client Support: EDI

Xpeditor, RemitMax, Audit Control Axis, or
Medical Necessity Data files
Phone: 866.422.8079
Fax: 440.777.2330
Monday – Friday
6:00 a.m. – 5:00 p.m. ET

Client Support: Labs

HARP, Patient Advocacy, or OnBase
Phone: 800.982.0665
Fax: 440.777.2330
Monday – Friday
8:30 a.m. – 7:00 p.m. ET


If experiencing critical issues with HARP, Patient Advocacy, or OnBase outside of normal business hours, after-hours support is onsite and available to assist you from 7:00 a.m. ET Monday – 5:00 p.m ET Saturday.

Quadax Locations


Corporate HQ

7500 Old Oak Boulevard
Cleveland, OH 44130
Phone: 440.777.6300
Fax: 440.777.2330


Software Development Campus

7070 American Veterans Pkwy
Cleveland, OH 44130



Quadax offices are closed in observance of the following holidays: New Year’s Day, Memorial Day, Independence Day, Labor Day, Thanksgiving Day, the day after Thanksgiving, and Christmas Day. Quadax offices are closed the latter half of the day on Christmas Eve. When holidays fall on Saturdays or Sundays, Quadax will observe the holiday by closing the office on a weekday adjacent to the holiday. All office closures will be announced by email to clients registered to receive notices.

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Contact Quadax

Quadax operates five offices throughout northeast Ohio as well as remote support staff offices in eight additional states.