38 C.F.R. § 19.33
Link to an amendment published at 84 FR 178, Jan. 18, 2019.
If, within the agency of original jurisdiction, there is a question as to the timely filing of a Notice of Disagreement or Substantive Appeal, the procedures for an administrative appeal must be followed.
(Authority: 38 U.S.C. 7105, 7106)