In this system, which entity is used to capture historical data changes?

• A. Contacts
• B. Patients
• C. Visits
• D. Billing

Answer: (A)

Tracking how contact information changes over time requires an area of the model designed to log those edits. In this system, the Contacts entity is used to capture historical data changes. It records each modification to a person’s contact details—like a new phone number, updated address, or changed email—with a timestamp and the user who made the change. This creates an audit trail you can review to see what changed, when, and by whom, which is essential for accuracy and accountability. For example, if a patient moves and their contact info is updated, the history preserves the old values and shows the new ones. Billing and Visits deal with transactions and encounters, while Patients holds core demographic data; placing the historical log in Contacts keeps change history focused on how contact details evolve over time.