Which of the following is a violation of HIPAA?

Sharing patient information in a public forum constitutes a clear violation of HIPAA regulations. HIPAA, the Health Insurance Portability and Accountability Act, was established to protect sensitive patient health information from being disclosed without the patient's consent or knowledge. By posting patient information publicly, a healthcare provider fails to ensure the confidentiality and privacy of that information, which goes against the basic tenets of HIPAA.

The other options don't violate HIPAA when conducted in accordance with its guidelines. For instance, sharing a patient's information with another provider is permissible and often necessary for treatment continuity, as long as it's done in a secure manner. Similarly, discussing patient cases in a private office setting typically does not involve unauthorized individuals and is considered an appropriate context for professional discussion. Documenting treatment notes in an electronic record is also essential for providing care and can be compliant with HIPAA if the electronic health record system is secure and access is restricted to authorized personnel.