Missed Appointments Awareness Campaign Of 346,291 appointments booked across Horizon in 2020, 13,912 failed to show. This affects Horizon’s ability to provide timely and quality care to its patients. Reducing missed appointments will translate to a decrease in wait lists and improved access to services for patients. If you can’t make your appointment, someone else can. Please call to cancel or re-book. Would you like to receive appointment notifications? Certain departments within Horizon can now send appointment confirmations and reminders by text message or email. More information is available here. View PDF