38 CFR §3.330

Such ratings will be governed by the provisions of § 3.158, “Abandoned Claims,” and § 3.655, “Failure to report for Department of Veterans Affairs examination.” The period following the termination or reduction for which benefits are precluded by the cited regulations will be stated in the rating. If the evidence is insufficient to evaluate disability during any period following the termination or reduction for which payments are not otherwise precluded, the rating will contain a notation reading “Evidence insufficient to evaluate from _____ to ______.