38 C.F.R. § 20.501
In a simultaneously contested claim, any claimant or representative of a claimant may file a Notice of Disagreement or Substantive Appeal within the time limits set out in Rule 502 (§ 20.502).
(Authority: 38 U.S.C. 7105(b)(2), 7105A (2016))
[57 FR 4109, Feb. 3, 1992. Redesignated and amended at 84 FR 183, Jan. 18, 2019]