Which activity would not be monitored while reviewing audit trails of access to patient information?

In the context of monitoring audit trails for patient information access, each of the activities serves a distinct purpose in ensuring the privacy and security of sensitive health data. Access by a healthcare provider, the use of patient IDs for accessing records, and changes made to a patient's treatment plan are all directly related to interactions with patient information.

Monitoring access by a healthcare provider is essential to enforce accountability and ensure that only authorized personnel are viewing patient information. The use of patient IDs for accessing records is crucial for tracking and verifying who is accessing specific data, thus helping to maintain the integrity of the records.

Changes made to a patient's treatment plan are another key aspect monitored within audit trails. This activity allows for the tracking of modifications that could affect patient care and treatment outcomes, ensuring that all changes are documented and traceable.

On the other hand, the activity regarding whether a patient set up an account in the patient portal does not typically fall under the audit trail for access to patient information. While the setup of a portal account is important for patients to access their information, it does not directly relate to the activities commonly monitored for securing patient data. Therefore, this activity is less relevant in the context of monitoring access and changes to sensitive patient information compared to the other options.