University of Michigan Hospitals Customer Service Phone Numbers Customer Service:+1 (734) 764-1817 Hospital operator:734-936-4000 Billing: 855-855-0863 Toll-Free, 734-615-0863 Locally Cancer AnswerLine: 800-865-1125 Compliments/Comments/Complaints: 877-285-7788 Emergency Department: 734-936-6666 Psychiatric Emergency Services: 734-936-5900 Volunteering: 734-936-4327 Operators: 734-764-1817
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