"Good," Hannibal said. "But you do know that you could talk to me. I would be bound by doctor-patient confidentiality. Couldn't say a word, least of all to your family."
Other options:
no subject
"Good," Hannibal said. "But you do know that you could talk to me. I would be bound by doctor-patient confidentiality. Couldn't say a word, least of all to your family."