38 U.S.C. § 5104C

1. (a)
   1. (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:
      1. (A)File a request for higher-level review under section 5104B of this title.
      2. (B)File a supplemental claim under section 5108 of this title.
      3. (C)File a notice of disagreement under section 7105 of this title.
   2. (2)
      1. (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—
         1. (i)the higher-level review, supplemental claim, or notice of disagreement is adjudicated; or
         2. (ii)the request for higher-level review, supplemental claim, or notice of disagreement is withdrawn.
      2. (B)Nothing in this subsection shall prohibit a claimant from taking any of the actions set forth in paragraph (1) in succession with respect to a claim or an issue contained within the claim.
      3. (C)Nothing in this subsection shall prohibit a claimant from taking different actions set forth in paragraph (1) with respect to different claims or different issues contained within a claim.
      4. (D)The Secretary may, as the Secretary considers appropriate, develop and implement a policy for claimants who—
         1. (i)take an action under paragraph (1);
         2. (ii)wish to withdraw the action before the higher-level review, supplemental claim, or notice of disagreement is adjudicated; and
         3. (iii)in lieu of such action take a different action under paragraph (1).
2. (b)In any case in which the Secretary renders a decision on a claim and more than one year has passed since the date on which the agency of original jurisdiction issues a decision with respect to that claim, the claimant may file a supplemental claim under section 5108 of this title.