2021 SUBSTANTIATION NOTICES OGB Request for More Information OGB Denial With Request for Repayment OGB First Receipt Reminder OGB Second Receipt Reminder OGB Overdue Notice 2019 SUBSTANTIATION NOTICES OGB Request for More Information OGB Denial With Request for Repayment OGB First Receipt Reminder OGB Second Receipt Reminder OGB Overdue Notice 2018 SUBSTANTIATION NOTICES Day 1 – Request for Substantiation Documentation Day 30 – Request for Substantiation Documentation – 30 Day Reminder Day 62 – Request for Substantiation Documentation – 62 Day Reminder Day 120 – Notification of Denied Claim