A method and apparatus for improving call yields and reducing redundant calls while contacting patients who have not responded to reminders to schedule a return appointment, or who are due for a visit according to accepted standards of care or office policies, but have not scheduled an appointment. The patient reactivation system is queried for the next patient on the contact list, and queried again to find all patients sharing one or more phone numbers with this patient. Information required for contacting these patients to invite them to make an appointment is displayed. The user is presented one phone number at a time, and prompted to call this number and invite all listed patients to make an appointment. Results are collected, and when multiple patients are displayed, the program may prompt the user for clarification regarding which patients a given result applies to. Based on the results collected, the system determines whether or not to prompt the user to call the same patients again with other phone numbers, if available. Finally, the system analyzes the set of results collected in order to calculate follow-up call times for each patient. The system may keep separate follow-up call times for each phone number as well in order to further improve the patient experience.