a.  Pursuant to 38 U.S.C. § 5110(b)(2) and 38 C.F.R. § 3.400(o)(2), where a veteran files a claim for increased rating alleging an increase in disability within one year prior to receipt by VA of the claim and a VA examination or other medical evidence subsequently substantiates an increase in disability, the effective date of the award of increased disability compensation is the date as of which it is ascertainable based on all of the evidence of record that the increase occurred.

b.(1)  Section 3.400(q)(1)(i) of title 38, Code of Federal Regulations, is applicable to a claim for increased rating based upon new and material evidence submitted prior to expiration of the appeal period or before an appellate decision is issued. 

b.(2)  When new and material evidence is submitted within the appeal period or prior to an appellate decision with regard to a claim for increased rating, the effective date for any increased rating is the date on which the facts establish the increase in disability occurred or the date of the original claim for increase, whichever is later.  However, if the facts establish that a veteran’s disability increased within one year prior to receipt by VA of the original claim for increased rating, the effective date of the increase is the date on which the increase in disability occurred.