38 U.S.C. § 5104C
(a) Within One Year of Decision.—
(1) Subject to paragraph (2), in any case in which the Secretary renders a decision on a claim, the claimant may take any of the following actions on or before the date that is one year after the date on which the agency of original jurisdiction issues a decision with respect to that claim:
(2)
(A) Once a claimant takes an action set forth in paragraph (1), the claimant may not take another action set forth in that paragraph with respect to the same claim or same issue contained within the claim until—
(D) The Secretary may, as the Secretary considers appropriate, develop and implement a policy for claimants who—
(Added Pub. L. 115–55, § 2(h)(1), , 131 Stat. 1108.)
Section applicable to all claims for which the Secretary of Veterans Affairs provides notice of a decision under section 5104 of this title on or after the later of 540 days after , or 30 days after the date on which the Secretary submits to Congress a certification of certain capabilities of the Department of Veterans Affairs to carry out the new appeals system established by Pub. L. 115–55 and to address appeals of decisions on legacy claims, with provision for early applicability of the new appeals system to certain claims, see section 2(x) of Pub. L. 115–55, set out as an Effective Date of 2017 Amendment note under section 101 of this title, and bracketed note thereunder.