- Checking Authorization Status For assistance: Contact the Provider Call Center at 1-888-FIDELIS (1-888-343-3547) All Prior Authorizations can be submitted online, except the following: Must be submitted via the appropriate fax line or by phone at 1-888-FIDELIS (1-888-343-3547): • Urgent RequestsLog In‧Manuals and Forms‧Submit Authorization Requests‧Welcome, Providers! - Fideliscare.Org.