20 C.F.R. § 418.3620
What is the effect of an initial determination?
An initial determination is binding unless you request an appeal within the time period stated in § 418.3630(a) or we revise it as provided in § 418.3678.
An initial determination is binding unless you request an appeal within the time period stated in § 418.3630(a) or we revise it as provided in § 418.3678.