Grady Parker, Jr. appeals the judgment of the Court of Appeals for Veterans Claims (“Veterans Court”), which affirmed the Board of Veterans’ Appeals (“board”) decision denying his claim for vocational rehabilitation benefits for the period during which his vocational goal was found to be infeasible, and dismissed for lack of jurisdiction his appeal regarding his claim for a compensable rating for service-connected hypertensive vascular disease. Parker v. Nicholson, No. 05-3609, 2007 WL 2301915 (Vet.App. July 31, 2007). Because we lack authority to review either “a challenge to a factual determination” or “a challenge to a law or regulation as applied to the facts of a particular ease” absent a constitutional issue, 38 U.S.C. § 7292(d)(2), we dismiss the portion of his appeal regarding the denial of retroactive vocational rehabilitation benefits.

The board did not reach the substance of his compensable rating claim for service-connected hypertensive vascular disease, because it remanded a threshold procedural issue — whether Parker’s notice of disagreement to an April 13, 2000, Department of Veterans Affairs Regional Office rating decision was timely filed in accordance with 38 U.S.C. § 7105 and 38 C.F.R. §§ 19.29, 19.30. Because the Veterans Court has jurisdiction only over final board decisions, it was correct to dismiss Parker’s appeal with respect to his claim for service connection for hypertensive vascular disease. Accordingly, we affirm that portion of the judgment.