20 CFR § 404.990
Finality of determinations and decisions on revision of an earnings record
February 18, 2021
A determination or a decision on a revision of an earnings record may be reopened only within the time period and under the conditions provided in section 205(c) (4) or (5) of the Act, or within 60 days after the date you receive notice of the determination or decision, whichever is later.