(a) After an appellate decision has been promulgated on a claim, a claimant may file a supplemental claim with the agency of original jurisdiction by submitting the prescribed form with new and relevant evidence related to the previously adjudicated claim as set forth in § 3.2601 of this chapter, except in cases involving simultaneously contested claims under Subpart E of this part.

(b) Legacy appeals pending on the effective date. For legacy appeals as defined in § 19.2 of this chapter, where prior to the effective date described in Rule 4 (§ 20.4), an appellant requested that a claim be reopened after an appellate decision has been promulgated and submitted evidence in support thereof, a determination as to whether such evidence is new and material must be made and, if it is, as to whether it provides a basis for allowing the claim. An adverse determination as to either question is appealable.