Members randomized to this arm of the study will receive an enhanced reminder protocol, which will include multiple reminders, multiple modalities, and motivational messages. The timing of reminders will depend on the wait time between the date the appointment is made and the date of the appointment.

• An email reminder will be sent to all members who have provided their personal email information.
• Members will receive up to two text messages that "roll over" to an IVR automated phone call if the text cannot be delivered.
• Members scheduled for colonoscopy will also receive a single IVR-T reminder to begin their bowel prep the morning of the calendar day prior to the procedure.

Members randomized to this arm of the study will receive a single text message that "rolls over" to an IVR automated phone call if the text cannot be delivered. This message will be delivered 7 business days prior to the appointment. This replicates the current protocol for GI procedures. Of note, members who schedule appointments within 7 days of the procedure currently receive no reminders.

This study will be a randomized trial over a 6-month period (March 8 through September 7, 2019) in 3 GI endoscopy clinics (Franklin, Rock Creek, and Lone Tree). All members currently receive a text reminder 7 days prior to their procedure, which rolls over to a telephone reminder if the text cannot be delivered or the member's phone is not text-enabled. Members will be randomized either to receive this standard IVR-T protocol (control) or to receive an enhanced reminder (intervention) protocol.

Data from the randomized trial, for both intervention and control participants, will be analyzed to develop a statistical prediction rule that identifies members at highest risk of missing their procedure.

The primary outcome for the study will be "appointment loss," defined by GI leaders as the combined rate of prior day cancellations, same-day cancellations, and missed clinic appointments ("no shows"). The rationale for this outcome definition is that it is difficult to schedule new procedures within this time frame.

A secondary outcome will be the assessment of the adequacy of the bowel preparation for colonoscopy only.