Quality Systems, Inc. Corporate Headquarters
17822 East Seventeenth Street
Tustin, California 92780
800.888.7955 (phone)
714.731.9494 (fax)
QSI Corporate (email)
Webmaster (email)
Sales/Marketing (email)

NextGen Healthcare Information Systems, Inc.
200 Welsh Road, First Floor
Horsham, Pennsylvania 19044
215.657.7010 (phone)
215.657.7011 (fax)
Webmaster (email)
Sales/Marketing (email)