Final answer:
It is not true that healthcare providers can disclose a patient's PHI to their sexual partners without consent, as it violates HIPAA regulations.
Step-by-step explanation:
The statement that is not true about obtaining a patient's written authorization for use and disclosure of protected health information (PHI) is that it's acceptable for healthcare providers to contact a patient's sexual partners without the patient's consent if the patient's diagnosis is revealed as part of the disclosure.
Under the Health Insurance Portability and Accountability Act (HIPAA), such actions could violate the patient's privacy rights.