Mailing address and fax number for written customer service, appeals and grievance requests: Essence Healthcare PO Box 5907 Troy, MI 48007 Fax: 1-888-480-2577 (customer service, and claims) Fax: 1-877-770-6440 (appeals) Fax: 1-855-964-0566 (grievance requests) Please note that our main...