Cheerful woman providing customer support.

“With “people” as one of our core values, valuing our employees is a top priority for Northwestern Medical Center. We care about you, your family and your overall health and well-being. We are proud to offer a comprehensive and competitive benefits package designed to help our people stay healthy, balance work and life responsibilities, protect their assets and plan for a secure financial future.”
Thomas C Conley, Vice President of Human Resources/OD


With over 35 years of experience, the Allegiance Companies have earned a reputation for quality, service, and efficiency unmatched throughout the country. Since its earliest days, our company has been a leader in providing health benefit plans to employer groups and plan participants throughout the United States. We have always remained dedicated to one thing: outstanding customer service. That commitment continues today as strong as ever. Our corporate spirit has always been one of allegiance to the companies we serve. Our people are deeply committed to our clients and to plan participants.


For assistance regarding a claim or to pre-notify for medical services, please call the Northwestern Medical Center (NMC) Customer Service number at 1-855-999-6830.

To find a network provider in your area, click on the Find Provider link on the top of the page.

CAA Customer Balance Billing Disclosure Out of Network