20 CFR § 418.3665
Can your request for a hearing or case review be dismissed?
February 18, 2021
We will dismiss your request for a hearing or case review under any of the following conditions:
(a) At any time before notice of the decision is mailed, you ask that your request for administrative review be withdrawn; or
(b) You failed to request administrative review timely and did not have good cause for missing the deadline for requesting review.