In situations where providers want to offer telemedicine services during off-hours, maybe in place of after-hours phone calls, on-call scheduling can offer flexibility. Often, providers who utilize the on-call schedule also require prior approval of all scheduled appointments to ensure that availability at the scheduled times. On-call schedules can still be limited to specific periods, and appointments that are scheduled at inopportune times can be rescheduled with a few clicks. Groups with multiple providers can use on-call scheduling similarly to how they provide phone coverage for after-hours calls. The biggest difference between the two is that an after-hours phone call is rarely reimbursed, while an after-hours telemedicine session is considered a reimbursable office visit in many cases.